Building Automation Knowledge Base

Issue How many messages are buffered on a 7798xx / 7793xx / 7791xx? Maximum number of the Message which can be stored on I/SITE locally? Environment I/NET Seven  7798, 7798B, 7798B1 and 7798C (I/SITE LAN) (SLI) Cause Even though every device in the system contains a message queue, only a few of the devices will successfully buffer the queued messages for later distribution. All controllers and Taps distribute messages out of their RS485 port even with the absence of any LAN communication. This is due to the fact that there is no requirement for an acknowledgment to be received at the generating device. The RS485 LAN is for both solicited and unsolicited message traffic. The only devices that perform extended buffering are the ones which directly communicate to polling devices such as the 7801 Taps, 7803 Taps, 7804 Taps, and all DPUs/SCUs. The MRs, ASCs, and UCs do not generate messages; messages relating to these devices are generated by the relevant MRI, MCI, etc. Resolution Controller software prior to I/NET version 2.xx = approximately 150 messages. Controller software for I/NET version 2.0 Without emulated tap: 100 Messages With emulated tap: 1000 Messages.

Issue How many messages are buffered on a Door Controller 7910A and 7920 DPU? Product Line TAC INET Environment I/NET Seven Door Controllers: DPU 7910A, DPU 7920, and SCU 1284 Cause Even though every device in the system contains a message queue, only a few of the devices will successfully buffer the queued messages for later distribution. All controllers and Taps distribute messages out of their RS485 port even with the absence of any LAN communication. This is due to the fact that there is no requirement for an acknowledgment to be received at the generating device. The RS485 LAN is for both solicited and unsolicited message traffic. The only devices that perform extended buffering are the ones that directly communicate to polling devices such as the 7801 Taps, 7803 Taps, 7804 Taps, and all DPUs/SCUs. The MRs, ASCs, and UCs do not generate messages; messages relating to these devices are generated by the relevant MRI, MCI, etc. Resolution Refer to the Database Caching in the Door Controller Chapter 9-11 in TCON 300-05/17 for full details. For the 7910A and 7920 see the following details:  Controller software before v.2.20 = 100 messages Controller software for 2.20 and later = based on the number of resident individuals (see table below).

Issue Need to know how many messages are stored in the buffer of an NPR Environment I/NET NPR Cause Host workstation disconnected or not masked to receive messages.  Need to know how much data is recoverable Resolution NetPlus Routers = approximately 1000 messages. Once this is full, messages are deleted on a First in First out basis

Issue What is the Standard Cubic Inches per Minute for a PWMP1? Environment PWMP1 Cause Configuration Question Resolution 216 SCIM @25 psi.

Issue What type of BIN is used when selecting “Typical” or the default install of I/NET 2000? Environment I/NET 2000 site Cause Refer to the Communication chapter in TCON209, I/NET 2000 Technical Reference Guide for information on synchronous versus asynchronous communication. Resolution Determine whether you will use synchronous or asynchronous communication. Setup's Typical option (the default) installs asynchronous BIN files. You should choose the Synchronous option to install synchronous BIN files. You may switch from synchronous to asynchronous, or vice versa, at a later date by choosing the Custom option and then selecting the appropriate controller binary files. Instructions are provided in Chapter 2, Installing I/NET in TCON 213.

Issue Which Controllers and Taps are supported by the MIP? Environment I/NET site Cause Which Controllers and Taps are supported by the MIP? Resolution 7700 7740 7741 7760 7770 7720 (8000 RTU) 7730 (P4300 DCU) 78035 LAN Tap 78040 Host/Link Tap (Dial) 78050 Link Tap (Dial) 78060 LAN Tap (Dial) 78041 Host/Link Tap (Dial w/o modem) 78051 Link Tap (Dial w/o modem) 78061 LAN Tap (Dial w/o modem) 7810 Printer Tap 78010 Host Tap 78015 Host/Link Tap (metal enclosure) 78020 Link/LAN Tap (metal enclosure) 78035 LAN Tap 78040 Host/Link Tap (Dial) 78050 Link Tap (Dial) 78060 LAN Tap (Dial) 78041 Host/Link Tap (Dial w/o modem) 78051 Link Tap (Dial w/o modem) 78061 LAN Tap (Dial w/o modem) 7810 Printer Tap

Issue I replaced the EPROMs and RAM in a 7700 DCU with a MIP, but now cannot do a software restore. What is wrong? Environment I/NET site Cause I replaced the EPROMs and RAM in a 7700 DCU with a MIP, but now cannot do a software restore. What is wrong? Resolution Verify that the network configuration is correct in the NET. Con. Editor. The "Dn" field for the TAP or Controller must be configured with a "Y" before the Tap/Controller will appear in the software Restore Editor.

Issue Will I/NET access control work with retina, palm or fingerprint readers? Product Line TAC INET Environment I/NET 2000 I/NET Seven Cause Access controls can use different forms of identifying individual users. Newer readers can scan retinas, palms, and finger prints. Resolution I/NET will work with bio scanners, provided they send a data string of the supported Wiegand bit rate for the version and firmware of I/NET in use, and it is in the order expected. Refer to BioScrypt V-Pass-2 (Biometric) Reader in I/NET Seven for an example or contact Product Support for more details.

Issue Is the point address automatically stored in Docutrend? Environment I/NET site Cause Is the point address automatically stored in Docutrend? Resolution No. The point address is not sent to Docutrend. Refer to TCON 084 or TCON 210.

Issue What is the maximum number of Docutrend cells a workstation can have? Environment I/NET Cause Configuration Resolution 1023 Cells.

Issue What is Docutrend? Environment I/NET site Cause What is Docutrend? Resolution A proprietary data storage, retrieval, and custom report definition and generation program provided with I/NET.

Issue What is a Demand Control in I/NET Software? Environment I/NET site Cause What is a Demand Control in I/NET Software? Resolution This editor is used to monitor and control electrical power consumption. With it, you can maintain a daily or monthly consumption total. Demand control enables demand shedding of electrical loads when demand is high, and the restoration of the loads when demand levels drop. This editor is used to direct demand data to a Docutrend cell.

Issue What is DIF? Environment I/NET site Cause Definition for DIF (Data Interchange Format) Resolution This stands for Data Interchange Format. It is a special format for data files that can be read by most major spreadsheet programs. Docutrend data can be converted into this format for use by a third-party software program. Refer to TCON 210.

Issue Explain the term "Distribution Group" Environment I/NET site Cause Explain the term "Distribution Group" Resolution I/NET has four distribution groups, each with eight mask positions, extending the number of possible masks in a system to 32. Messages must match both a distribution group and active mask position before being accepted by a host.

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.

Issue A more in-depth description of each of the Direct Digital Control (DDC) modules in I/NET Product Line TAC INET Environment I/NET DDC DCUs, PCUs, MRs Two Position Module (2POS) PID Controller (PID) Float Module (FLT) Reset Module DDC Hi/Lo Module (HI/LO) Relay Module (Single Pole Double Throw Relay) Calc Module Cause DDC is a system that measures a variable, compares the variable with a known value to determine the error, processes the error using a specific software algorithm, and then produces an output to modify the controlled variable. Resolution Most of these modules are discussed in both TCON 083 or  TCON 299 System Operator Guide for more details. (The System Operator Guide is installed by default on your I/NET Host Workstation) DDC Two Position Module (2POS) This module is used where the final control element is in either one state or another opposite state (ON/OFF, OPEN/SHUT). This type of control will commonly be used for simple heating or cooling systems, starting and stopping motors, controlling water sprays for humidification, etc. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC PID Controller (PID) In Proportional (P), Proportional + Integral (PI), and Proportional + Integral + Derivative (PID) control, the control element moves linearly to a position that is proportional to the deviation and the rate of deviation of the controlled process variable from a prescribed setpoint. This type of control, in any of its three modes, or combinations thereof, is commonly used for the control of modulating valves, vanes or modulating motors where a proportional output control point is used. The proportional output control point may be either an analog output (voltage, current, resistance) or a pulse width output where the duration of the pulse is proportional to the error variation. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC Float Module (FLT) Traditionally, floating control actuates a control device when the error, i.e. the difference between the controlled process variable and the setpoint, exceeds a deadband and maintains the control until the error is within the deadband. The floating controller is based on the same principle however it has been enhanced to include PID control without the requirement for analog output or pulse width position feedback. The output of this controller may be directed toward either a pair of variable pulse width discrete outputs to control a bi-directional drive motor or dual EP value arrangement which is generally described as a "pressure-vent" controller. This type of control is commonly used for the same applications as the PID controller where positive feedback is either unnecessary or economically unsound. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC Reset Module (RESET) Reset is used to develop a setpoint output in an inversely or directly proportional relationship to one or two analog inputs and one or two operator-specific reset schedules. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC Hi/Lo Module (HI/LO) This module is used to provide the highest and/or lowest value from two or more measured variables, most commonly temperatures. HI/LO can be cascaded to accommodate virtually any number of inputs of similar nature. Typically the lowest space temperature would be the most logical to use to directly reset the heating water setpoint. The HI/LO modules provide the control engineer with a convenient alternative method for making the selection. The HI/LO modules may also be used as an OR/NOR selector by using the state(s) of various monitored discrete points. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC Relay Module (Single Pole Double Throw Relay) This module provides a mechanism for selecting one of two values or states based on conditions within the controlled environment. The actions of the relay are controlled by one discrete input and control which of two input states or values is directed to the output. The inputs and output may be either discrete or analog. The actions of this relay are analogous to its electric/electronic counterpart in its simplest form. This module is available in our PCUs and DCUs; and you can customize it for your needs.  DDC Calc Module This module functions similarly to calculations added to a point through the calculation extension editor. This module is only available in Micro Regulators (MR). It is not available in Application Specific Controllers (ASC). 

Issue What are Conversion Coefficients? Environment I/NET site Cause What are Conversion Coefficients? Resolution These are mathematical constants a controller uses to convert analog input / outputs from the digital value used by the microprocessor to analog display values. Conversion coefficients are also used to convert digital commands from the microprocessor into analog outputs which are then used by field interface devices.

Issue After installing an update to SmartXKiosk, an error message is shown when trying to launch the app License file not found. Please contact Schneider Electric. Product Line EcoStruxure Building Operation Environment SmartX Advanced Display SmartXKiosk Cause The SmartXKiosk update (apk file) needs to be installed on top of the factory delivered version. If the current version of SmartXKiosk is removed before installing the update, some files are missing on the tablet. Also refer to Which address and port does the SmartX Controller Advanced Display use for activation for additional information regarding license activation. Resolution A full installer of the app is needed. Contact Product Support and request a full installer.

Issue What is DBF? Environment I/NET site Cause What is DBF? Resolution It is a Docutrend database function that allows you to extract the tenant number, key/card number, or data from one of the access control personnel database files.

Issue What is a DPI? Environment I/NET site Cause What is a DPI? Resolution It is a Door Processor Interface. It is also called a 7791. The DPI provides a communication gateway between the controller LAN and the DPUs.