Building Automation Knowledge Base

Warning Potential for Data Loss: The steps detailed in the resolution of this article may result in a loss of critical data if not performed properly. Before beginning these steps, make sure all important data is backed up in the event of data loss. If you are unsure or unfamiliar with any complex steps detailed in this article, please contact Product Support for assistance. Issue If SOAP is already enabled, what functionality is added with SX SDK Enabled? Product Line Security Expert Expert Environment Security Expert Controller Security Expert SOAP Web Service Software Development Kit (SX-SOAP-SDK) Cause The SDK license allows you to develop and deploy new and custom third-party integrations Resolution SOAP itself is included with Security Expert. You can use first-party apps like web client(s) or existing integrations. If you are building your interface or integration (third-party apps), then the SDK license is required. There is no change in the product itself. The SDK license includes all the development tools necessary (API documentation and sample codes) to develop a custom interface and build custom integration to the Security Expert Server

Warning Hazard of Electric Shock: Remove all power from all devices before removing any covers or doors of the system. Disconnect power at the device and at the power source. Electrostatic Discharge Required: Always discharge static electricity from your person by touching metal prior to handling any hardware. Failure to do so may result in damage to devices. Issue Making up battery cables and need to know the part number of the 2-pin battery connector. 2-pin battery connector Product Line EcoStruxure Security Expert Environment Security Expert SP-PSU-4A SP-PSU-8A Cause Parts not listed in documentation. Resolution The part number for the 2 pin connector is: 2114H-02 The part numbers that make up each of the battery cable types are: CABLE-BATT-SINGLE 2114H-02 x 1 2114T x 2 D70400BS-2 x 2 CABLE-BATT-DUAL (This is an extender for the single cable) D70400BS-2 x 2 A27740CT-ND x 2

Issue Extended log data not being saved to the database. Error stated that controller should be returned online and reloaded. Product Line Andover Continuum Environment Cyberstation SQL Extended log data Extended logging Error Troubleshooting logs Cause Error is generated indicating a mismatch between the Database and controller. But reloading the point does not always cure the problem. Resolution The error Unable to find Extended Log records to download states that it was added to the point when the controller was off-line. This can often be the case and the controller should be returned online and reloaded. However if this does not resolve the problem there are other extended logging issues that can cause this message: Ensure the system is set to be using Enhanced alarm logging and delivery if the system is V1.5 or above, it should have been configured (in the DB initialisation) to use this. See Alarm Forward and Log settings with enhanced alarm logging causes unnecessary network traffic. Run the Continuum analyser to ensure the database is not corrupt. Fix any issues and reload the controller. The controllers have not been fully reloaded. Ensure that a full reload including all attached controllers has been done and that this does not generate any errors. Ensure software and firmware is compatible for the version you are using, see Compatibility matrix. Also check Operating system versions and .Net versions are correct for the version used. Verify that you have set the same UTC times for the country in the Network, all Workstations and all BACnet controllers. Check that one Workstation has the time synchronisation program running to keep the CX's in sync' (Time sync controllers to workstations). Look at the Continuum error log to make sure you are not getting Extended log time synchronisation errors. Check for network problems; use the Controller offline alarm to verify no controllers go offline. Controller Network problems can stop the objects from saving to the controller which will cause a mismatch between the DB and controller requiring a reload. Ensure the Workstation IP address is a fixed address in the Windows settings and it matches the Workstation IP address in the database, as viewed in Offline Editing. Verify only 1 network card is fitted and enabled in the PC.  

Issue SoapEwsRestProvider serves data sourced from any EWS Server using the standard EWS SOAP protocol. The architecture for the SmartConnector REST Extensions integrates Swagger to provide a rich self-documenting API. Below errors indicate configuration issues. The User Name or Password were incorrect. "Message": "Authorization has been denied for this request. " "Message": "The HTTP request was forbidden with client authentication scheme 'Digest' " Product Line EcoStruxure Building Operation. Environment Building Operation Automation Server Building Operation Automation Server Premium Building Operation Automation Server Bundled Building Operation Enterprise Server Building Operation Enterprise Central Cause Smart Connecter or EBO Incorrect configuration. Resolution Make sure that SboEwsRestProvider is started and has a correct port that is not used by any other Smart Connector data provider or other application.   Make sure that EWS server address has the following format: HTTP: http://ipAddress:port/EcoStruxure/DataExchange HTTPS: https://ipAddress:port/EcoStruxure/DataExchange For ES/EC, check software administrator to make sure there is no port conflict: Software Administrator shows red outline (box) on the Communication Ports (HTTP / HTTPS) - Communities (se.com) In EBO, make sure EWS server is enabled: Enabling the EcoStruxure Web Service Server Check if username and password used for the SOAP provide has correct permissions and can be used to login to EBO server. If the user is not located in the default domain, make sure to add the domain name in the Username string, ex. "Domain/User". If HTTP protocol is used (not recommended), check the following: In EWS server configuration, make sure that "Enforce Secure Communication" to Disabled. In Security Manager, make sure that "Enable Incoming http communication" is enabled.

Issue On December 13, 2012, the certificate verifying the authenticity of the Schneider Electric I/A Series G3 Workbench Applet (wbapplet) expired. Users will see the following error in their browser when accessing a station that is using a version of the wbapplet.jar with an expired code signing certificate: Environment Niagara G3 Cause When accessing an I/A Series G3 station through a web browser using a WbWebProfile, the web browser runs Workbench within a Java applet. To enhance security, this applet is 'signed' using a code signing certificate. This ensures that the applet has come from a reliable source and can be trusted to run with the proper permissions. Certificates used to sign applets are issued by a Certificate Authority (CA). Each code signing certificate issued by a CA has an established expiration date, with the maximum expiration being two years. Once this expiration date has passed, continuing to use a Java applet with an invalid certificate will result in warning messages within the browser. The applet will only be allowed to run after the user has acknowledged the warning and granted approval. Resolution An updated certificate is available in the new wbapplet.jar, available from The Exchange Download Center. This file will need to be added to the Enterprise Network Server, as well as on any ENCs that will be accessed from a browser. This file is for all released versions of TAC I/A Series G3 and is valid until March 30, 2015. Download wbapplet_March_2015.zip. Extract the wbapplet jar file  Click and Download The WbApplet Installation Guide. Note: Updated WbApplet files are available as part of upcoming Niagara 3.5 and 3.6 maintenance builds, as well as being from the Source website. In 3.7, wbapplet.jar is integral to the web.jar and contains an up to date certificate.;

Issue Automation Server is going online and offline when viewed from an Enterprise Server. NOTE: Depending on the network setup/IP switch arrangement, having a duplicate Automation Server (AS) IP address can manifest itself by the AS continually resetting itself (Status LED going red, then flashing green, then solid green, followed by red again) over a 1 to 2 minute cycle. Product Line EcoStruxure Building Operation Environment SmartStruxure Enterprise Server StruxureWare Building Operation Workstation Automation Server Cause Duplicate IP address assigned to the AS. IP conflicts will cause the AS to go offline in the ES. Resolution Check that the AS has a unique IP address on the network. If not, consult the IT department to verify that they can provide a unique static IP address. Also, isolate the AS temporarily using a switch and see if the issue stops.

Issue Missing DLLs Environment SigmaX Sigma X DLLs DLL MFC71 mfc71u Cause The Microsoft Foundation Class libraries are normally installed as standard on a PC. But most applications these days are .NET. It may be that Windows 7 does not install all the MFC libraries as standard. Resolution Option 1: If the error shown below in Fig1. is displayed, you may be able to correct the problem simply by downloading this zipped file which contains both MFC71.dll and mfc71u.dll. Copy these to your "C:\Windows\System32" directory.   Fig 1. DLL files also available here. Option 2: The libraries can be installed by installing the Microsoft Visual C++ 2005 redistributable library which can be obtained free of charge from Microsoft. Copies are also available as a direct download. Click on the link below for the version required to download from the Microsoft website. Microsoft Visual C++ 2005 Redistributable Package (x86) Microsoft Visual C++ 2005 Redistributable Package (x64) Click on the link below for the version required to download direct from here. Microsoft Visual C++ 2005 Redistributable Package (x86) Microsoft Visual C++ 2005 Redistributable Package (x64)

Issue Adding StruxureWare Building Operation license from file fails. The following are the error messages. "License Administrator Major error number: 50044 Minor error number: 71013 System error number: 1 System error message: Description: Error occurred during call to repair locally. Define: LM_TS_LOCAL_REPAIR"   Environment StruxureWare Building Operation License Administrator Cause The cause for this problem is unknown at this time.  Resolution If the problem is not resolved after an uninstall and re-install of the License Server / Administrator then follow the procedure listed below.  Please contact Product Support for further investigation if the problem is not fixed with this procedure.  Exit all StruxureWare Building Operation applications. Stop the License Server (in Windows Services). Uninstall the License Administrator / Server using Windows Add/Remove Programs. If you have multiple versions installed, uninstall all versions. In Windows paths detailed below, search for files that are in the format 'taclic_*_tsf.data' and delete them. There could be other files in the this directory that ends with 'tsf.data' as there could be other 3rd party applications using FLEXnet licensing. Delete only the files that starts with 'taclic'. Windows 7 go to the 'C:\Program Data\FLEXnet\' directory (Windows 7).  Note:This folder may be hidden by Windows 7, Click Here on how to view these paths. Windows XP, the path to the FLEXnet folder is 'C:\Documents and Settings\All Users\Application Data\FLEXnet'. or C:\Documents and Settings\All Users.Windows\Application Data\FLEXnet). Note:This folder may be hidden by WindowsXP. Install the License Administrator and add the license file as per the normal procedure.  Note: If you are unable to delete the files in step number 4, go to Windows Services and stop the FLEXnet Licensing Service and try again. 

Issue All the doors under an ACX5720 can not be loaded with an attribute. The system status value goes back to "Nodatabase" after reloading the ACX controller. Some doors no longer open on a card swipe. The event type is "Invalid attempt" and the message event is "No Destination Area." When reloading the controller (or just a door object) the error below is seen in the distribution properties: "UNABLE TO RELOAD ATTRIBUTES FOR (**DOOR NAME**). UNABLE TO RELOAD OBJECT. ERROR TEXT UNDEFINED (TBD) 0X00002001. AN ERROR WAS DETECTED WHILE ATTEMPTING TO SET AN ATTRIBUTE IN A REMOTE INFINITY OBJECT" Product Line Andover Continuum Environment ACX5720/5740 Continuum 1.94 Cause The channel configuration may not be correct. Resolution Set all the channel numbers to 0 for the door Select the door separately Send it to the controller If there is no error when sending the door to the controller, then reset the all the channel numbers correctly. Change the value of systemstatus to "Normal" Reload the ACX controller  

Issue Looking at the Status Information on the MSTP network object under the BACnet Interface of the Automation Server, the status read online FALSE Environment Automation Server - AS Cause The AS is not being passed the network token. If the Automation Server sees the token being passed on the bus but it never receives the token the AS will tag the MSTP network status as OFFLINE.. Resolution Possible reasons/solutions. CAUSE: Baud rate mismatch with third party devices. SOLUTION: If device does not support auto-baud change the speed of the MSTP to that of the device. CAUSE: A device on the MSTP is using the same mac id as the MSTP port. SOLUTION: Resolve the duplicate id issue. CAUSE: A defective device on the MSTP SOLUTION: Identify the defective device and replace it.

Issue BACnet Interface has "!" with unresolved references Product Line EcoStruxure Building Operation Environment Building Operation Automation Server v2.0 or later Building Operation Multi-purpose VAV Building Operation Multi-purpose Controller Cause During the startup of a Smart-X controller, the auto-association feature fails and the data becomes corrupted Resolution Go to BACnet Interface -> Time Sync Recipients Find any devices listed as DEVICE_<Instance ID>, select & delete Verify all devices listed are configured as follows: SmartX controllers Recipient Type: Reference Recipient Device Object Reference: <Device in System Tree> If Recipient Name does not match, copy from Object Reference and paste in the field. This helps humans troubleshoot the issue. DO NOT set Recipient Type = MAC Address, Network ID = Global Network or Local Network, Mac Address = Broadcast. This will set time on other ES/AS with BACnet Interface on the BACnet System.

Warning Potential for Data Loss: The steps detailed in the resolution of this article may result in a loss of critical data if not performed properly. Before beginning these steps, make sure all important data is backed up in the event of data loss. If you are unsure or unfamiliar with any complex steps detailed in this article, please contact Product Support for assistance. Issue Uninstall PCT doesn't uninstall Oracle VirtualBox Product Line EcoStruxure Building Operation Environment Building Operation Project Configuration Tool (PCT) Cause The uninstaller of PCT doesn't include VirtualBox as part of the uninstallation. Resolution 1. Uninstall PCT from “Control Panel\All Control Panel Items\Programs and Features”. 2. Uninstall PCT Client. 3. Uninstall Oracle VM VirtualBox.

Issue WorkStation will play audible alarms but the same alarms will not play in WebStation Product Line EcoStruxure Building Operation Environment Building Operation WebStation   Cause Alarms can be viewed in WebStation but they do not have audible alarm sounds.  Resolution Audible alarms are available in WebStation from 3.2 onward.   See online help topic: WebStation and WorkStation Differences - EcoStruxure WebHelp

Issue TC303 thermostat parameter 2 setting and energy saving mode operation Product Line Field Devices Environment TC303-3A2DLMS TC303-3A4DLMS Cause The TC-303 parameter 2 setting is used to configure the fan operation status (fan on or fan off) after the temperature setpoint is reached. In the datasheet, it indicates that when the energy saving mode is activated, the fan will run at low speed. The datasheet does not mention what will happen if parameter 2 is set to fan off and energy saving mode is activated. Resolution Test results: If parameter 2 is set to fan off when temperature is reached, the fan will turn off when energy saving mode is activated. Below is the test result in cooling mode. Parameter 2 set to 00 (fan off when temperature is reached) Room temperature 24.0°C / Setpoint 20°C Enable energy saving mode - fan turns off  Parameter 2 set to 01 (fan on when temperature is reached) Room temperature 24.0°C / Setpoint 20°C Enable energy saving mode - fan continues to run.  If parameter 2 is set to fan off when temperature is reached, the fan will off when in energy saving mode when the temperature is reached. See below for test results in cooling mode.   1. Parameter 2 set to 00 (fan off when temperature is reached) Room temperature 24.0'CSetpoint 20'C Enable energy saving mode - fan turns off   2. Parameter 2 set to 01 (fan on when temperature is reached) Room temperature 24.0'CSetpoint 20'C Enable energy saving mode - fan continues to run.  If parameter 2 is set to fan off when temperature is reached, the fan will off when in energy saving mode when the temperature is reached. See below for test results in cooling mode.   1. Parameter 2 set to 00 (fan off when temperature is reached) Room temperature 24.0'CSetpoint 20'C Enable energy saving mode - fan turns off   2. Parameter 2 set to 01 (fan on when temperature is reached) Room temperature 24.0'CSetpoint 20'C Enable energy saving mode - fan continues to run. 

Issue Control Valve Sizing Environment Control valves Cause Selecting the wrong control valves can cause improper control operation  Resolution Refer the Application Note CA-28, Control Valve Sizing. This is a good reference document for sizing a control valve. 

Issue How to create a write to file notification that creates a comma separated value (CSV) file. Product Line EcoStruxure Building Operation Environment Building Operation Enterprise Server (ES) Building Operation Automation Server (AS) Cause Write to file notification has options for Excel and text formats, but no option for CSV format. Resolution As the name suggests, Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data (numbers and text) in plain text, where each line of the file typically represents one data record. This means that the text format can be selected in in the notification to provide a CSV file.   Building Operation 1.7 and earlier Under file name, use the extension .csv. See screenshot below:   This will produce a .csv file located in your database folder under the Notification folder.   Building Operation 1.8 and later With the introduction of "Variable Triggered Notifications" and "Alarm Triggered Notifications," users can now find the Write to File option within the "Distribution method" in the Triggered Notification Object. Within the Configure Write to File window, users will have the option to save the file with the .csv extension.   Using write to file option to save Text file with .csv extension This will produce a .csv file located in your database folder under the Notification Files folder.  File location in the system tree   For additional information and guidance, refer to the Notifications topic in EBO WebHelp.

Issue Set up a MR-VAV-AX (ASC) as Standalone Product Line TAC INET Environment MR-VAV-AX Cause Air balance must be done to calibrate the airflow sensor on the MR-VAV-AX. Resolution Download Tech Tip 072   Equipment: Air Balancing Hood or Manometer and Digital Thermometer.   Assumptions: The MR is powered up. An I/STAT, or an M/STAT is plugged into the service port of a S/STAT or W/STAT, which is plugged into the MR-VAV-AX. The AHU is running. The Space sensor is installed. The Duct static pressure is constant. The dip switches are set properly for the desired VAV configuration. (See TCON 147) You have a Pocket Reference Card (TCON 149). You are familiar with the use and operation of the I/STAT / M/STAT with respect to navigating the Service mode to various mnemonics’ menus. (See TCON 147)   Initial Setup You should notice that two things have already happened: The MR is in the unoccupied mode. The setpoint adjust has defaulted to "-5", making the setpoint display appear low. For the MR to work in a Standalone mode the use of an off-board time clock for the occupied and unoccupied times is recommended. It should be connected to the "Local Occ" point(TB5 input #2 to TB5 ground.) The "Occ" mnemonic under Unit Parameters must be set to ONE for the "Local Occ" point to be used. If the MRs are to be left in the occupied mode indefinitely, install a jumper across the "Local Occ" point instead of using the time clock contacts. Connect the jumper to (TB5 input #2 to TB5 ground.) Using the I/STAT or M/STAT go to Set Temp and increase the value by 5°. This will get the Setpoint Adj. back to zero.   "Cooling Low Flow" (CLF - min. CFM) and "Cooling High Flow" (CHF - max. CFM) Setup Put the I/STAT or M/STAT into the Service Mode. Go to "AP", select "CLF", (the value displayed is "multiplied by" 1000 so 0.24 is 240). Enter the minimum CFM by using the arrow keys to position the LED for the digit to be changed and enter the value by using the "+" and "-" keys. Notice the decimal position will not move. You are entering the value "multiplied by" 1000. Refer to the Pocket Reference Card (TCON 149), paragraph 5. Usually the minimum air flow value can be found on the Mechanical box schedule drawings. The lowest reading that the ASC’s sensor can sense is about .03" to .05" of Water Column(W.C.) Therefore, the "CLF" must be set above this level. If the ASC is required to control in that range, it will tend to oscillate. Select "CHF" and enter the maximum CFM for this box at 1" W.C., this can be found on the DeltaP to CFM graph that is associated with this VAV box’s pickup device, or the box schedule may also provide the maximum cfm value.   Central Plant Heat "Heating Low Flow" (HLF) and "Heating High Flow" (HHF) Setup Use only if Central Plant Heat is required and setup Unit Parameter’s(UP) CPH set to "1". An open contact at Input 3 will indicate that the Central Plant Heat mode is on. A closed contact indicates CPH is off. Using the procedure described above for "CLF" and "CHF" instead select "HLF" and "HHF" and enter the desired Low and High Flow CFM values for the Heating Mode. Otherwise go to the next section. NOTE: If you have a auxiliary stage of heat, it will not be energized unless the CFM input is reading at least 80% of the "HLF" setting.   Calibrate the flow pickup: Go to Unit Parameter "UP", select "dd" (duct diameter). Enter the duct diameter this will enable the MR to calculate the Pickup Factor "PF" for us. NOTE: It is recommended that you begin with the value provided by the VAV Manufacturer for the pickup factor. Then calibrate if necessary using the following procedure. Go to "AP", select "PPF" (pickup factor calibration). The MR will drive the box open and modulate the damper to maintain the "CHF" level. This may take 5 - 10 minutes. NOTE: The stroke time is defined using the Damper Stroke (ds) parameter. The ASC provides several means of synchronizing the point with the physical damper position. 1. When this point is controlled to a value of 0, the decrease pulse will be on for 125% of the damper stroke. 2. When this point is controlled to a value of 100, the increase pulse will be on for 125% of the damper stroke. 3. When the damper stroke duration is modified, the decrease pulse will be on for 125% of the damper stroke. 4. When the power is cycled on the ASC, the decrease pulse will be on for 125% of the damper stroke. 5. Any time the ASC is the target of an Update_ASC or a Copy_Parms, the decrease pulse will be on for 125% of the damper stroke. After the reading has settled out, take a reading with a Hood or Manometer, which has been setup, and measure the actual CFM and enter that value now into the I/STAT-M/STAT using the Select and change buttons. The software has entered a unique Pick-up Factor "PF" in the MR for this box.   Calibrate space temperature (if necessary): To calibrate the Space Sensor while in the Service Mode, go to "oP" Operational Parameters. Select "CSS" (calibrate space sensor). Measure the actual temperature with a digital thermometer and enter the value. If your box has no heat or has a fan with electric heat. You’re finished. Go to the next box.   Hot water coil: If you have a hot water valve on your box and the stroke time is not 600 seconds: Go to "UP" (Unit Parameters) and select "Ho", Heating Output. Select1 for 1-OutPWM, 2 for 2 Out-PWM(Floating), or 3 for Duty Cycle 1 output. Go to "UP" Unit Parameters and select "HS" (heating stroke) and enter the actual stroke time in seconds.   Air Balance: If you require closely calibrated CFM readings proceed with the following steps: Go to "AP" (Airflow Parameters) Select "CPL" (calibrate low flow) and the damper will begin to close. Remember, the damper motor may take 3 minutes to get to the Cooling Low Flow setpoint. With a Hood, measure the total air flow and enter the measured CFM value. Select "CPH" (calibrate high flow). The damper will drive open to the Cooling High Flow setpoint. (remember the damper motor has a 185 sec stroke). When the reading stabilizes, take your measured CFM reading and enter it now. This procedure will de-calibrate the CFM input from the 0-1"readings to compensate for box, pickup, or hood irregularities/errors. Caution: When the decision is made to connect the MR-VAV-AX to a MRI or MCI please note the following: Avoid updating the MCI or ASC after initial setup as this will delete any MCI resident calculations, ATS, etc. that you may have added off-line that are residing at the same point addresses that the MR-VAV-AX is using. There are a variety of box types and a variety of other things that can be change if your application requires it. (Refer to TCON147)

Issue Although data is read correctly from the TSI Pressura RPM20 Hospital Room Pressure Monitor when integrated to a SmartStruxure Solution Automation Server, Modbus read errors and framing errors are seen. Product Line EcoStruxure Building Operation Environment SmartStruxure Solution Automation Server SmartStruxure Solution Automation Server Premium Modbus RTU Cause The instruction manual from the manufacturer incorrectly lists  the Modbus communication parameters for the RPM20 as 9600 baud, 8 data bits, 2 stop bits and no parity. Resolution Investigation of the data from the device shows that the Modbus communications parameters are: 9600 baud 8 data bits 1 stop bit No parity Ensure that these parameters are set in the Automation Server Modbus Master Network configuration.

Issue Some sensors such as the SCR110-H CO2 produce a noisy signal even when wired according to the documented instructions. The following is a trend chart of the unfiltered raw signal from the sensor. Environment Automation Server Continuum controllers TAC Xenta Cause Noisy signal is typically caused by common ground wiring of AC power. Resolution SOLUTION #1 Signal noise can usually be eliminated by using an isolated transformer to power the sensor separately as opposed to using a common transformer that powers up several pieces of equipment. SOLUTION #2 For sensors that support  AC and DC input voltage, signal noise can usually be eliminated by using DC instead of AC power source to power the sensor. SOLUTION #3 Implement a Slew Rate to filter out the noise. As of version 1.7.1, StruxureWare Building Operation does not have a built-in slew rate functionality. Nevertheless, a custom slew rate can be implemented using Script programming. See HowToDebounceANoisySensorSignal.pdf SOLUTION #4 Add a filter (FILT) in a Function Block program after the signal input Description: The function block is a discrete time first order software filter. The filter time constant is specified in seconds with the Time Const parameter. The initial block output value is zero. The filter algorithm is y(k) = y(k-1) + 1 / 1+T/h (u(k)-y(k-1)) where y(k) and u(k) are the filtered and unfiltered values at time k, respectively,h is the sampling interval (i.e. the application program cycle time), and T is the filter time constant. If the time constant is less than or equal to zero, no filtering is done. To obtain a good filter function, the time constant should be set significantly greater than the application program cycle time. This filter algorithm is based on a straightforward backward difference approximation of the continuous time derivative operator. SOLUTION #5 Ensure you are not using older versions of the IO Firmware. As detailed in TPA-SBO-17-0006.00 the firmware should be at least V2.015 in the modules and is available on the Download Center.

Issue What does DLCU stand for? Environment I/NET site Cause What does DLCU stand for? Resolution Distributed Lighting Control Unit. This is a specialized type of controller or DCU. The 7780 is a DLCU. The DLCU is specifically designed for lighting.