Building Automation Knowledge Base

Issue Are any of the Schneider Electric access software products FIPS compliant? Environment FIPS compliant access control Cause New U.S. Government access control regulations. Resolution FIPS Compliance information The Federal Information Processing Standard 140-1 (FIPS 140-1) and its successor FIPS 140-2 are United States Government standards that provide a benchmark for implementing cryptographic software. They specify best practices for implementing crypto algorithms, handling key material and data buffers, and working with the operating system. Both IPSec and the Encrypting Files System (EFS) in Windows 2000, Windows Server 2003 and Windows XP use the FIPS-140-1 evaluated Kernel Mode Cryptographic Module to encrypt the traffic packet data and file contents respectively if configured appropriately with the selections of FIPS compliant algorithms. The FIPS-compliant, kernel-mode, crypto module lets organizations deploy FIPS 140-1-compliant, Internet Protocol Security (IPSec) implementations using: L2TP (Layer Two Tunneling Protocol)/IPSec VPN client and server. L2TP/IPSec tunnels for gateway-to-gateway VPN connections. IPSec tunnels for gateway-to-gateway VPN connections. IPSec-encrypted, end-to-end, network traffic between client and server, and server to server. Currently, I/NET Seven is not FIPS Compliant. There are not any plans to make I/NET Seven FIPS Compliant. The Continuum product line is FIPS Compliant. Click here for a PDF with more information. FIPS 140-2 Validation Certificate http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/140crt/140crt1355.pdf Schneider Electric Continuum Network Security Module http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/140sp/140sp1355.pdf

Issue  Script error when navigating menu in TGML graphic in 1.4. Graphic was working fine in 1.3. Product Line EcoStruxure Building Operation Environment Workstation Enterprise Server Automation Server Cause In releases prior to 1.4, graphic objects were not unloaded when navigated away from. This has been fixed in 1.4. As a result of this change, If a TGML has a navigate in a script (by using invoke) this could cause a script error if there are scripts on parent elements. Resolution Open the graphic Navigate to the script and edit, or view in source mode Add evt.stopPropagation(); before the invoke in the Click() function. For an updated version of the component without the error, go to the community: Navigation Menu (JF/Denmark) rev 2.

Issue What sensors can be used in Clean Rooms  What sensors can be used outdoors for temperature measurement What sensor can be used in a swimming pool What sensor would be explosive proof What color is the wall sensor and are custom colors available Environment Building Automation System such as I/NET, Vista, or Continuum at a site containing a clean room, swimming pool, or outdoors Cause Questions concerning the uses of Schneider Electric sensors in Clean Room applications Questions concerning temperature sensors for Outdoor installations Questions concerning temperature sensors for swimming pools Questions concerning explosion proof sensors* Questions concerning color and custom colors for sensors Resolution All the Schneider Electric temperature sensors found in the HVAC Sensor Catalogue as well as on iPortal provide high accuracy and can be mounted on the wall, in ducts, or in a J-Box. Appendix A provides the accuracy for each of the temperature sensors. Color: STR series wall sensors are: Front Cover: White NCS S-0500 N Core Plate: White NCS S-0500 N and Gray NCS S-2500 N Base Plate: Gray NCS S 1502-R Manufacturing in custom colors in not available. One option could possibly to have the sensors locally custom finished to meet customer's requirements. While there is not a direct cross reference to RAL colors, our engineering team has found the closest alternates. Please see the attached pdf. Clean Room: Depending on the specified limits of the clean room, the variety of sensors offered by Schneider Electric are possible solutions. Thing you may want to research are the standards required for the site. Clean rooms are a controlled environment where products are manufactured. It is a room in which the concentration of airborne particles is controlled to specified limits. Eliminating sub-micron airborne contamination is really a process of control. These contaminants are generated by people, process, facilities and equipment and must be continually removed from the air. The level to which these particles need to be removed depends upon the standards required. The most frequently used standard is the ISO 14644 Standards, which were first formed from the US Federal Standard 209E Airborne Particulate Cleanliness Classes in Cleanrooms and Clean Zones.  ISO 14644 is a document that establishes standard classes of air cleanliness for airborne particulate levels in cleanrooms and clean zones. Strict rules and procedures are followed to prevent contamination of the manufactured product. The only way to control contamination is to control the total environment. Air flow rates and direction, pressurization, temperature, humidity and specialized filtration all need to be tightly controlled. Outdoor:  Schneider Electrics selection of Outdoor Temperature Sensors are the STO100, 200, 500, & 600. These outdoor sensors are intended for outdoor wall mounting. Variants are available for Vista, I/NET, Continuum and Satchwell systems. The body has a 20mm conduit entry and the product is supplied with a conduit gland. Range -40 to +90 °C Accuracy See Appendix A: Table A, C, F in the attached HVAC Sensor Catalog.pdf Outdoor Temperature Sensor STO100 Order Code 5141100010 Part Number STO100 System Vista, Xenta Outdoor Temperature Sensor STO200 Order Code 5123246000 Part Number STO200 System I/NET Outdoor Temperature Sensor STO500 Order Code 5141104010 Part Number STO500 System Continuum Outdoor Temperature Sensor STO600 Order Code 5126060000 Part Number STO600 System Satchwell Outdoor Temperature Sensor STO600D Order Code 5126000000 Part Number STO600D System Drayton Outdoor Temperature Transmitters STO300 The STO300 transmitter is supplied as a complete unit, comprising a sensing element and an amplifier mounted in a housing which is resistant to ultraviolet light. The transmitter is intended for mounting on an outside wall, on the north side where possible. The transmitter is connected over a 2-wire cable, which serves both as power supply and signal transmission. The reading of the measured signal is made over an external load resistance. Outdoor Temperature Sensor STO300 -50/50 Order Code 006920501 Part Number STO300 -50/50 System All Note for each of these outdoor sensors, find the Description, the Order Code, Part Number, and the System it works with for the iBAS (intelligent Building Automation System) Please note the difference in Weatherproof and Outdoor. I put a lot of these outdoor sensors in at a university in Texas, and always installed in places that were a little protected. I found that under porches, up under the eves and out of the sun, or along a loading dock out of the rain and ice gave me accurate readings. Swimming Pool: In the piping system of a swimming pool is a corrosive environment with steadily harmful and gradually destructive minerals and chlorine in the water which present a challenge finding sensors able to withstand for extended periods of time. Schneider Electric makes several immersion temperature sensors. Beginning on page 12 of the above HVAC Catalogue, there is a variety of immersion sensors for the different iBMS lines.  One example is the STP660 is a Temperature Sensor for the European market, and intended for immersion mounting in pipe or the circulating systems. The stainless steel probe is a good solution but remember,  if the sensor is to be installed in pool water that contains chlorine, the best bet is to use a stainless steel pocket. I suppose it all depends on if sensor is in pipe associated with the secondary pool side of the system or the heating side of the system. If the sensor head is in an area exposed to Chlorine, then there may be an issue.  Chlorine may attack the solder connections of the wired joints inside the sensor. In the old days products from Satchwell used to produce special sensors for such applications where the wire connections were varnished in order to prevent corrosion. I think at the end of the day, our sensor would have a similar life expectancy to other devices in the plant that were no designed for use in such corrosive atmospheres. Explosion proof sensors: Schneider Electric does not manufacture explosion proof sensors. We do not partner with another manufacturer who provides such sensors. The closest is an 3rd party explosion proof enclosure with one of our available sensors. Our sensors are designed for building installations and if in extreme environments, we suggest enclosures.  

Issue Upon rebooting an MP-V, that has not yet gone through a Flow Balance, the Box Flow data goes to zero. Product Line EcoStruxure Building Operation Environment Building Operation Multi-purpose VAV Cause When a box is not yet balanced, the Balanced K-Factor is zero. Part of the calculation of Box Flow is based on the Balanced K-Factor. Resolution There are two workarounds for this issue: Workaround 1: Balance the box Workaround 2: Enter in a number for the Box measured maximum flow and the Hood measured maximum flow. Either option will update the Balanced K-Factor to being a non-zero value.   This has since been fixed and first consolidated in IPC Hotfix 3.01.02.02000 (CP1), and fixed in release firmware release v3.02.01. See details in Box Flow goes to zero on restart, warm start, or cold start in the Known Issues and Solutions community page.

Issue Debugging SpaceLogic MP and RP controllers Modbus RTU Product Line EcoStruxure Building Operation Environment Building Operation Multi-purpose Controller Building Operation Multi-purpose VAV Building Operation Room Controller (RP-C) Building Operation RP-V VAV Building Operation EZLogic RP-C Building Operation EZLogic RP-V Cause There is no packet data can be logged or viewed for Modbus MP and RP controllers and RP controller has no transmit and receive LEDs for the Modbus and no packet data can be logged or viewed. Article Modbus in the MP and RP Controller Introduction provides information on the differences between the Automation Server and MP and RP controllers Modbus operations. Resolution There are a couple of options, but they involve using another device connected to the Modbus network to view the packets Use a PC based Modbus slave simulator Use an Automation Server set up as a Modbus RTU slave, the packets can be sent to the trace log then viewed in the usual way.  Note: A defect with v3.2.1 EBO means this solution cannot be used to monitor a Modbus RTU bus because the AS replies to all requests and may cause conflicts on the network. All versions 3.1.2 and earlier work fine, as well the EBO 2022 (v4.0.1) as detailed in the Known Issue Modbus Slave incorrect response Can use Picoscope to perform Serial Decoding for Modbus RTU as detailed in Picoscope Configuration for Modbus RTU capturing and decoding

Issue Troubleshoot Security Expert Controllers showing offline in the client. Product Line EcoStruxure Security Expert Environment Security Expert Cause Require some common troubleshooting steps to help determine why controllers may be offline to the client. Resolution The main items to check are: Refer to the Troubleshooting Security Expert Controller Connectivity - Application Note on Exchange. If a controller has failed and the Replacement controller unable to be brought online then check if controller encryption had been enabled on the replaced controller. Restart the client software. Power restart the controller. Remove power Wait for all LED's on the controller to go completely off Apply power to the controller. In the controller web interface, on the Settings page, check that Event Server 1 has the correct IP address. Check that the Firewall is disabled. Check any Anti-Virus Firewalls/settings as well. If the Firewall cannot be disabled, ensure that all required ports are open between devices. See SX-SRVR Security Expert - Network Administrators - Installation Guide for details. Restart the Security Expert services under the PC's Services option in Control Panel. These need to be restarted when any changes are made. Confirm that the User Interface, Data Server, Event Server and Download Server module versions are all the same. Go to About  > Version and check there. If the database has not been upgraded to the same version as the client software, then this can cause communications issues. On the Security Expert Server check that MSMQ is installed as this is now a requirement   Security Expert MSMQ is required (Not showing live point status / shows "Unknown Status" error)   If MSMQ was installed after Security Expert, you'd need to reinstall Security Expert to allow it to run correctly. If MSMQ is installed and controllers are still not coming online (or the controllers are "bouncing" offline/online) then anecdotal evidence suggests enabling Windows 8 Compatibility Mode may help especially for Windows Server 2016 and Server 2019. Set the Windows 8 Compatibility Mode checkbox in the Properties page for C:\Program Files (x86)\Schneider Electric\Security Expert\SecurityExpertEvtSvr.exe   Also, note that if a database backup has been imported, then there is a need to check/change some other settings as well to ensure everything is set up for the specific server and controller.   Under Global > Download Server confirm that your computer name is the name of the PC where the download server service is running. Under Global > Event Servers ensure that the computer name is the name of the PC where the event server service is running. Under Sites > Controllers confirm the Serial number, IP Address, Download Port, Download Server and Control and Status Request Port match what is set in the controller's configuration web page (browse to the controllers IP Address to view). On that same General tab go to Diagnostic Windows and open the download and event server windows. Review the information contained and if there are any errors shown. Right click the controller and select Get Health Status. Review the status messages displayed.

Issue Global and indirect points are very useful and are usually a mandatory part of most application programs. It is seen that in the event of a LAN failure or any failure of the indirect point being updated, the indirect point will be flagged as "Old Data." When this occurs any process using the indirect point as a variable, say, calculation extension, event extension will freeze at the last status/value before the old data on the indirect point was detected. Even though other parameters are still valid, the calculation and the event extensions will remain frozen, and some occasion remain in this state even when the old data is cleared from the source. Any subsequent process that uses the calculation or event definition will also be frozen. Any PID DDC Modules, Floating DDC Modules and 2 Position DDC Modules that uses the indirect point that has been flagged as "old data" will force those DDC modules to "Fail Safe" mode. Product Line TAC INET Environment ALL I/NET Software and controller LAN (CLAN) based controllers Cause LAN failure or any failure of the indirect point being updated. Resolution There are various tools available within I/NET to filter "old data" from subsequent control processes.  These include: Filtering by Calculation AVG operator function (including point types AI, DI and DO) Filtering by Direct Digital Control (DDC) Modules using either the Relay or HiLo modules Click Here to download a document which details these methods. For further details and recommendations when using Global and Indirect points, refer to the following I/NET Global and Indirect Points Overview and Recommendations.

Issue Troubleshooting guide for ASD bus communications. Product Line TAC IA Series, EcoStruxure Building Operation Environment I/A Series Legacy Controllers ( GCM, MicroZone II, MicroFlo II, LIM, PEM, MN-ASDI) I/A Series R2 UNC I/A Series G3 ENC Building Operation Automation Server Premium ( Pre EBO 2022 ) I/A Series N4 Jace 8000 Cause Troubleshooting guide for ASD bus communications. Resolution This checklist provides several settings/configurations to review when faced with a communication problem at the controller level. The content was compiled from different resources, summarized, and laid out in an easy-to-use manner so as to provide a quick-reference document. NOTE:  The ASD protocol is not supported in EBO 2022 or subsequent versions

Issue Netcontroller power supply is not working as expected. Environment NC1 NC2 CX9900 CX9680 PS120 UPS Cause Problems with Netcontroller power supply. Resolution UPS not working Replace failed 5 Amp pico fuse (located on PC board adjacent to the UPS cable connector) UPS cable or connector has failed or is defective. Insufficient UPS battery capacity is attached to the UPS connector.  UPS requires two 12 VDC batteries). UPS Batteries are not sufficiently charged or have failed. No Power to NetController 3 Amp Slow-Blow fuse has failed.  (located on PC board adjacent to 120 volt power connector). Power switch is shut off. Insufficient supply voltage. General Mode switch is in the wrong position (See manual) Click here to download the PS manual

Issue Often data is required to be exported out from the Continuum system for record keeping or for further analysis, what keywords can be used to help with this? Environment Cyberstation Plain English programs - all versions. Microsoft Excel Product Line Andover Continuum Cause Specific help is available in the product for specific keywords but how can these be put together to export data to .CSV format. Resolution As we do not advocate 3rd party system trying to directly extract data from the Continuum database, you should create a Plain English program in a Workstation that can export logged data directly from the controllers out to a .CSV or .TXT file.   Keywords to use for this purpose are: OpenFile WriteFile CloseFile   Details of the above Keywords are available in the Cyberstation internal help pages.   The attached example dump file could be run on a daily basis to extract temperature logs from a controller and save them to files with a date stamped naming convention.   Click to download the example WriteFile dump file. 

Issue InfinityInput configured as counter does not count any pulses. Environment i2 devices B3 devices IOU modules Cause Here are two common reasons why the counter input may not be counting as expected: 1. No accumulation logic used with input. 2. Signal from the count source does not conform to specifications. Resolution 1. No accumulator logic used with input. The value of a counter input is reset to zero at every scan, in order to maintain the count value an accumulation strategy must be used, this can be accomplished via a conversion at the input or by using a PE program to accumulate the count in an InfinityNumeric object. a) Enter the following conversion in the counter input’s conversion field: Value + ElecValue Or b) Use the following logic in a PE program CountAccumulator = CountAccumulator + WaterMeterCount  (Where CountAccumulator is an InfinityNumeric object and WaterMeterCount is the name of the counter input)   2. The signal from the count source (Water meter, Power meter etc) does not have the minimum pulse width required by the input. For example, Infinet 2 devices (i.e. i2687) only support counter signal with a maximum frequency of 4 hertz and a minimum pulse width of 125 milliseconds. The DI8 IOU module has 2 channels that support counts of up to 10Khz with a pulse width as short as 50 microseconds. XPUi modules support counter inputs with a frequency up to 140 Hz and a minimum pulse width of 3.5 milliseconds. Refer to the manual for your count source (Meter) and verify the signal generated by it complies with the requirements of the Continuum hardware. For more information see the attached Infinity Technical Journal article. It describes several ways to reset the counter.   Note: Some meters will put out a pulse with a voltage equal to the supply voltage. In this case add a relay so the controller sees a dry contact per pulse.    

Issue Need to mirror a switch port in order to capture controller data with Wireshark.   Product Line Access Expert, Andover Continuum, EcoStruxure Building Expert, EcoStruxure Building Operation, TAC IA Series, TAC INET, TAC Vista Environment NETGEAR Prosafe Plus Switch Cause Need a step-by-step guide to set up a mirrored port and an understanding of how it works.  Resolution View the attached video.   Use the link to the original post in Area360 to get written instructions.

Issue Resource Advisor platform, which serves as a repository for water, gas, and electric invoices, enabling customers to focus on evaluating metered data. Assisting organizations that are committed to sustainability. Setup information. Product Line EcoStruxure Building Operation, EcoStruxure Resource Advisor Environment Building Operation Automation Server Premium Building Operation Enterprise Central Building Operation Enterprise Server Cause Information on setting up Resource Advisor is not available for download Resolution Click this link for an overview of Resource Advisor. Attached is a more detailed document including EBO Setup Guide and links for additional Resource Advisor information.

Issue Muster Report triggered to generate and print Product Line Andover Continuum Environment Muster Reports on a Continuum site Cause With Muster Report loaded, can you trigger from a input (example: fire alarm) for a report to be generated and automatically print? Resolution With some workstation PE programming, you can launch the Muster Report to automatically print. You will need to install and configure the "Plain English Alarm Function" available from Can Plain English interact with the Continuum Alarm Engine? This will trigger a workstation Function each time an alarm is received. You will write PE code to detect the specific alarm and/or point, then "Shell" to launch the Muster Report. Please find the attached Muster Report User Guide and .dmp file which is renamed as .txt file which should be useful.

Issue How to Lockdown your facilities using Continuum area/door lockdown functionality. Product Line Andover Continuum Environment CyberStation CX9680 ACX5740/20 Cause Need a fast and efficient way to lock down multiple areas in one operation when a threat is perceived at a site. Resolution The Continuum Physical Access Control System supports an advanced feature that allows for quickly locking down parts of or an entire building or campus via the areas/doors that are under physical access control by the Continuum system. This functionality is available in second-generation access controllers such as the CX9680 (NC2) and the CX5720/5740(ACX2) In Continuum, lockdown of an area or door means that access to the area/door via the physical access control system is restricted in such a way that prevents the movement of individuals into the locked-down area/door as well as keeping individuals from leaving the area/door under locked down. Locking down an area automatically locks down all doors associated with the area; Continuum also allows doors to be locked down individually. When a door/area is locked down, all credential access attempts and exit requests are denied. The only way to gain access into the locked-down door/area is by the use of a credential that has been designated with ‘Executive Privilege’ in the system. Note though, that a person with executive privilege may gain access into a locked-down area/door via the credential reader but if the mode of egress from the area is via Exit Request then such person would not be able to exit the door thru the normal exit request mechanism as there is no way for the person to indicate her ‘executive’ privilege by any means other than presenting the proper credentials (card or PIN) at a reader. This document outlines several methods of implementing area lockdown for a building or campus such as a school, the methods outlined in the document are provided for illustration purposes only and are not to be taken as a complete solution but rather as general guidelines. On legacy controllers that do not support the Area Lockdown feature (CX99xx, ACX7xx), we can still secure the doors by setting their state to disabled which prevents the doors from processing credential access attempts as well as Request to Exit, please note that in this case, NO ONE (including executive privilege personnel) will be able to gain access to the door until it is re-enabled How to Lockdown your facilities using Continuum area lockdown outlines several methods of implementing area lockdown for a building or campus such as a school, the methods outlined in the document are provided for illustration purposes only and are not to be taken as a complete solution but rather as general guidelines.

Issue Cannot establish communications to Modbus RTU using BCX X-Driver on Comm2 Environment BCX 4040 Modbus RTU Cause Configuration of BCX to communicate with Modbus RTU device Resolution This excerpt from the Modbus RTU guide describes the parameters to configure the X-driver for Modbus RTU communications using the BCX. Click Here

Issue What HHC (Hand Held Console) cable do I need to connect to a DCU, UCI, or PCU? Product Line TAC INET Environment I/NET HC7410 HHC (Handheld Console) Cause Can not locate documentation to indicate which cable is required. Resolution Original HHC: The part number is 602135-0003. It is a six foot (or 1.8 m) coiled, silver modular cable. Refer to the appropriate controller TCON for more details.   HHC (Hand Held Console) is also called the HC7410. Refer to TCON 073 for more details. Updated USB HHC: This is the replacement for the HHC. TCON318 has more information. The HHC-USB-IF cable allows you to connect the hand-held console (HHC) port of a TAC I/NET device to the USB port of a PC. You can then use the HHC emulator running on the PC to configure the I/NET device’s controller LAN address, tap emulation, baud rate settings, monitor and control points, and perform the other typical local maintenance functions supported by the earlier HC7410 console product. The HHC-USB-IF cable can be used with the model 7716, 7718, 7756, 7780, 7790A, 7700, 7740, and 7750 Distributed Control Units (DCUs), and the model 7760 UCI

Issue Can I use a Setpoint Adjust Device (LTS80 Setpoint Adjust Knob or S/STAT Setpoint Adjust Slider) on most Controllers? Product Line TAC INET Environment LTS80 Setpoint Adjust Device S/STAT Setpoint Adjust Slider Cause Provide users with a physical knob or slider to control the space temperature setpoint. Resolution With a little programming it can be done. Refer to Tech Tip G074.

Issue webClient schedules getting error 'request for permission of type' system.security.permissions Product Line Andover Continuum Environment webClient Cause Require to run the Caspol commands. Resolution Run the Caspol commands, here is a batch file that runs these commands without typing them in. Click Here to download the batch file   Rename the caspolwebclient.txt to .bat Run the batch file at each WS that needs to access webclient schedules. Below are the actual commands: The following command will add FullTrust to the Internet_Zone in DotNet 2.0: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\caspol.exe -m -addgroup Internet_Zone -zone InterNet FullTrust -name FullTrust The following command will add FullTrust to the Trusted_Zone in DotNet 2.0: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\caspol.exe -m -addgroup Trusted_Zone -zone Trusted FullTrust -name FullTrust This will result in output like: The operation you are performing will alter security policy. Are you sure you want to perform this operation? (yes/no) Then select Y and you should see: Added union code group with "-zone" membership condition to the Machine level. Success In some configurations, you may need to add the IIS computer into Internet Explorer as a trusted site for each browser. Internet Explorer > Internet Options > Security > Click trusted Sites > Click Sites Type in http://yourservername/webclient and click Add (Ex. http://tacweb/webclient) Deselect the checkbox for Require server verification (https:) for all sites in this zone. Click OK and Ok Close Internet Explorer and access webclient See Removal of MS KB2858725 Dot Net 4.5.1 causes issues with Web Servers IIS Functions if this is for 1.94 SP1 - Uninstalling KB2858725 * It may be necessary to give specific permissions in the registry if you are seeing system.permissions.UIPermission, mscorlib Make a backup of the From Windows, Start> Run> Regedt32.exe Expand the hives(folders) to HKEY_CLASSES_ROOT\CLSID\{00B01B2E-B1FE-33A6-AD40-57DE8358DC7D}\InprocServer32\2.0.0.0 Right Click on 2.0.0.0 and select export, name the file and save. (This file can be used to restore the original settings of this branch)  Right click on this folder again and select permissions, select Users and add Full Control See below for snapshots

Issue Instructions and programming example for using SNVT_Switch as an input or output in Menta Product Line TAC Vista, EcoStruxure Building Operation Environment Menta Function Block Cause The attached programming example is intended to clarify how to properly use SNVT_Switch in Menta. SNVT_Switch is a structured SNVT with two attributes, or members, State and Value. Programmatically this will be one SNVT in the device template, but it will be programmed as two separate analog points in Menta. These two public blocks will have different names in Menta, but they will share the same SNVT name with the exception of one of the points being the state member, and the other being the value member. It is important to remember that these points must always be programmed as analog points in Menta. AI's for input points, and AO's for output points. The state attribute is intended to be used for a binary on-off signal, but also contain the value -1 for Invalid value. The value attribute is intended to be used as a 0-100% signal. This SNVT is typically used in the market for starting and stopping a VFD drive and sending a speed reference with the same SNVT. The 0,1 value on the state member will start and stop the drive, and the value member will send a 0-100% speed signal. Resolution Please see the attached Menta macro as a guide to using SNVT_Switch in Menta. This example shows you SNVT_Switch as an input and as an output to the Xenta controller. To use this macro please follow these steps: Download the attached macro from above. Unzip the file and extract the SNVT_Switch.MTA from the archive to the local hard drive. Open Menta Right-click in Menta and click Load Macro Browse to the SNVT_Switch.MTA on the local hard drive and open it. It should import into the Menta file that is open.