Building Automation Knowledge Base

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.

Issue What is a MRI? Environment I/NET Site Cause What is a MRI? Resolution It is a abbreviation for Micro Regulator Interface. This is a 7792. The MRI provides a communications gateway between the controller LAN and the MRs on the SubLAN.

Issue What is Override Billing? Environment I/NET site Cause What is Override Billing? Resolution This is a point extension editor that lets you compute the amount of time a customer overrode the after-hours operating parameters for heating, cooling, and lighting.

Issue In relation to Docutrend, what is "Propagation"? Environment I/NET Site Cause In relation to Docutrend, what is "Propagation"? Resolution This is a Docutrend extraction option that instructs the system to "fill in" missing data by repeating the last valid entry until it once again encounters valid data. This option is primarily used with time-based plots.

Issue What is a Tenant? Environment I/NET site Cause  What is a Tenant? Resolution In the I/NET access control system, these are groups of individuals that inhabit the same facility but that are controlled separately.

Issue What is String Compare (SCP)? Environment I/NET site Cause What is String Compare (SCP)? Resolution This is a Docutrend function that allows you to compare two ASII strings from the access control personnel database file (ACPXXX).

Issue What is Masking? Environment I/NET site Cause What is Masking? Resolution Masking is a filtering process for sending data based on the distribution group and active mask position(s) of both the originating and destination equipment. This applies to messages, alarms, and other data. Read TCON210 and TCON300 for further explanation.

Issue What is a Leased Line? Environment I/NET site Cause What is a leased line? Resolution This is a permanent communication line providing full-time access between two devices.

Issue What is a Event Definition? Environment I/NET site Cause What is a Event Definition? Resolution This is a editor that lets you specify certain definable conditions which trigger event sequences, action messages, Docutrend reports, or DOC-to DIF conversations.