Building Automation Knowledge Base

Issue Technical Support Services occasionally receives calls concerning the use of DC/DM points in the Micro Regulator product line. The use of DC/DM points in MRs is possible but only when certain guidelines are followed. Environment SubLAN controllers MRs UCs Cause The functionality of the DC/DM points depends on what is actually controlling the DC point. If you use any of the extensions that reside only in the MRI, MCI or I/SITE LAN, etc., to control the DC point you will not have a problem. These extensions include: Time Scheduling, Temperature Control, Calculations and Event Sequences . As long as one of these editors controls the state of the DC point you should not see a problem with the functionality of the DC/DM points. Where you run into trouble is when an MR resident editor controls the DC point. These include all of the modules found in the MR Resident DDC editor, (PID, Floating, Two Position, Relay, Reset, Calculation module). If the state of a DC point is controlled by any of the MR resident DDC modules the associated DM point will always alarm in one state or the other. The same is true for the UCI/UC product line in that a DC point can not be controlled by a UC resident editor. This includes everything under the Unitary Control editor, (VAV, AHU, PID, FLT, HPMP ). In fact, currently if an attempt is made to enter a DC point in any of these editors an error is generated which will not allow such an entry, (this error is not generated in the MR Resident DDC editor). Resolution If you need positive feedback like that provided by the DC/DM points please follow the guidelines set below: Create Control Description and State Description Parameters: Refer to figure 1 and 2. Create an External DO point for Fan Control. Refer to Figure 3. Create an External DI point for Fan Status. Refer to Figure 4. Create an Internal DA Point for Fan Alarm. Refer to Figure 5.  Create a Calculation for the DA point: Refer to Figure 6. Anytime the Fan Control DO and the Fan Status DI follow each other’s state, the calculation remains True. If the DO does not equal the DI State, then the calculation becomes False. This results in an Alarm after the Time Delay of the DA has been met. The Time Delay acts in the same manner as the Time to State for a DM point. Please note if the DI 0 state was ON (the opposite of the DO), the calculation would be P0=~P1 .   *MSG* 09/21/95 12:34:29 Thu Control descriptions and commands Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Enter up to 4 characters:  # Description Command Delay --+-----------+-------+-----  0 STRT 1 0  1 STOP 0 0  2 0 0  3 0 0  4 0 0  5 0 0  6 0 0  7 0 0  8 0 0  9 0 0 10 0 0 11 0 0 12 0 0 13 0 0 14 0 0 15 0 0 Figure 1: Control Description and commands *MSG* 09/21/95 12:35:14 Thu State descriptions Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Enter up to 4 characters: # Description # Description --+----------- --+----------- 0 OFF 16 1 ON 17 2 ALRM 18 3 NORM 19 4 20 5 21 6 22 7 23 8 24 9 25 10 26 11 27 12 28 13 29 14 30 15 31 Figure 2: State descriptions *MSG* 09/21/95 12:36:19 Thu Resident I/O points Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Point 0000 (02290000 DO) Enter up to 16 characters: Parameter Value Parameter Value ---------------------------------------- ------------------+-------- Point name Fan Control Distribution group 1 Point class Ext Distribution mask -------- Scan interval (seconds) 60 Alarm priority - Global level Local Message priority - State description 0 Cell number 0 Control description 0 Restart control action Reinforce Minimum trip (minutes) 0 Minimum close (minutes) 0 Three-state output N Figure 3: Resident I/O points *MSG* 09/21/95 12:36:19 Thu Resident I/O points Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Point 0000 (02290000 DI) Enter up to 16 characters: Parameter Value Parameter Value ---------------------------------------- ------------------+-------- Point name Fan Status Distribution group 1 Point class Ext Distribution mask -------- Scan interval (seconds) 10 Alarm priority - Global level Local Message priority - State description 0 Cell number 0 Number of bits 1 Supervision None Figure 4: Resident I/O points *MSG* 09/21/95 12:38:56 Thu Resident I/O points Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Point 0009 (02290009 DA) Enter up to 16 characters: Parameter Value Parameter Value ---------------------------------------- ------------------+-------- Point name Fan Alarm Distribution group 1 Point class Int Distribution mask Y------- Scan interval (seconds) 10 Alarm priority Priority Global level Local Message priority Priority State description 2 Cell number 0 Number of bits 1 Normal state 1 Alarm delay (seconds) 120 Supervision None Figure 5: Resident I/O points *MSG* 09/21/95 12:39:57 Thu Calculations Host 00 (CSI) Link 02 [78020] DCU 29 [DCU 7798] Point 0009 (Fan Alarm) Enter point address or name: Equation --------------------------------------------------------------------------- P0=P1 Operand Point Operand Constant -------+---------------- -------+---------------- P0 Fan Control P1 Fan Status Figure 6: Calculations   The above calculation will return the following DA conditions depending on the state of the DO and DI DO DI DA OFF OFF NORM ON OFF ALRM OFF ON ALRM ON ON NORM

Issue When adding a point to a graphic page within a DLA system, is the site number added to the icon? Environment I/NET site Cause When adding a point to a graphic page within a DLA system, is the site number added to the icon? Resolution No. Since station addresses on the controller LAN beneath the NPR must have unique addresses, this will be adequate to identify the points.

Issue Viewing DLA AMT data on a non-DLA host Environment I/NET Site Cause Need for viewing DLA AMT data on a non-DLA host Resolution Yes. If you copy the InetAMT.mdb file (that was used on a DLA host) into the non-DLA host, you should successfully be able to view the AMT data. The difference will be that the Site column will not be visible and the new Link/Site Name column will be replaced by the Link Name.

Issue What files are affected when performing the Repair function from DLA setup? Environment I/NET site Cause What files are affected when performing the Repair function from DLA setup Resolution The files that are repaired when executing the repair function are all EXEs and DLLs only. Corrupt Netcon, AC, Sav, and config.dat files will not be repaired.

Issue Can DLA functionality be used on all I/NET 2000 host revisions? Environment I/NET site Cause DLA Functionality on older I/NET sites Resolution No. DLA functionality is not available for systems prior to I/NET 2000 revision 2.12.

Issue Controllers have a Boot ROM revision. What is its purpose? Environment I/NET site with controllers Cause Controller in Boot state. Resolution The purpose of the Boot ROM is to allow dial-up capability with 06 emulated controllers when the controller is at the boot-state. This will allow the operator to download the bin file via dial.

Issue If a controller is not being used for 06 emulation, does the Boot ROM revision need to be the same as the host revision? Environment I/NET site Cause 06 Emulation Resolution No. Only needs to be the same when 06 emulation is being used.

Issue When upgrading a system, are there any issues with ASC controllers whose revisions date back to pre I/NET 2000? Environment I/NET site Cause ASC Controllers before I/NET 2000 Resolution Should not be any issues. UPD files for all ASC controller revisions are included within I/NET 2000.

Issue Can an NPR and modem setup for integrated NPR dial, allow a "back door" into a company's Ethernet lan (i.e. compromising their network security)? Environment I/NET site Cause NPR and modems set up for integrated NPR dialing do not pose security risks to a network Resolution The NPR will not talk to a PC unless it has I/NET running. This eliminates the possibility of using it as a "back door" to bypass network security measures.

Issue Do I need to purchase NPR's to put I/NET on the local network? Environment I/NET site Cause Do I need to purchase NPR's to put I/NET on the local network? Resolution Your local I/NET host(s) merely need to have NIC (network interface cards) installed and working. You will need to obtain properly assigned, static IP addresses from the network administrator. The only time you will need an NPR, is if you have controllers in stand alone mode, with Ethernet connecting them to I/NET hosts. If you do not wish to have a host near the controllers, you can situate an NPR to act as an Ethernet tap

Issue How to set momentary duration (pulse duration) on a 7780? Environment I/NET site Cause How to set momentary duration (pulse duration) on a 7780? Resolution Using a Hand Held Console: Press [Code], then type 07 and press [Enter] to set momentary duration. The current momentary duration in milliseconds displays. Enter the desired delay in milliseconds and press [Enter]. The range is 0-255 (0-2.55 seconds). For example, entering 100 from the HHC results in a one-second pulse to the relay to turn it On or Off. When using a standard 7780, the momentary duration value should be set to a minimum value of 10 (0.1 seconds).

Issue How to command all lights ON/OFF Environment I/NET site Cause How to command all lights ON/OFF Resolution Using a Hand Held Console Press [Code], then type 08 and press [Enter] to set All Lights On. The HHC display 0000. Type 1 and press [Enter] to enable All Lights On. To set All Lights Off, press [Code], then type 09 and press [Enter]. The HHC displays 0000. Type 1 and press [Enter] to enable All Lights Off. Side note: If code 08 and/or 09 have been used to enable the “All Lights On” and/or “All Lights Off” functions, input point addresses 0000 and 0001 will control the lights as desired. In the case, do not use these input points for any other hardware inputs. If these input points are used for other hardware inputs, the lighting circuits controlled by the 7780 DLCU will turn on/off unexpectedly.

Issue If a wink is attached to a circuit that is attached to more than one zone on which zone will it work? Environment I/NET site Cause Wink cycle attached to a circuit that is attached to more than one zone on which zone will it work? Resolution If you have a circuit attached to more than one zone with a wink cycle on it, the circuit will wink on the zone that turns off last. If you have a circuit attached to two zones and both zones turn off the lights at five, then the wink cycle will start at five.   If you have a circuit attached to two zones and one zone shuts off at five while the other zone shuts off at six, then the wink cycle will begin at six. One more example, is if the zone is set to two different zones and the zones are at different times. One is from seven to five and the other zone is on from eight to eleven, then the wink cycle will work at five then at eleven.

Issue If multiple circuits are on a zone and only one circuit has a wink cycle on it, will all the circuits wink Environment I/NET site Cause If multiple circuits are on a zone and only one circuit has a wink cycle on it, will all the circuits wink Resolution No, the circuit with the wink cycle attached to it will be affected by the wink cycle. The other circuits will shut down when the zone goes to off.

Issue The Analog inputs are reading too high or too low on a 7780. Product Line TAC INET Environment 7780 Cause Resistor configuration errors, damaged power supply, or the circuit may have been shorted. Resolution Several things could be contributing to this. Check the resistor configuration installed for the input and make sure it is correct. Check is the analog power supply (+15 VDC) has been damaged. Make sure a sensor does not have an open circuit in it (sensor is shorted).

Issue The Discrete Input readings are incorrect on a 7780, what causes that? Environment 7780 Cause Input resistors are incorrectly configured. Resolution Configure Resistors according to TCON100

Issue The Output relays will not control on a 7780, how can I fix this? Environment I/NET site Cause Output relays will not control on a 7780 Resolution First, check the matrix relay interface cable and make sure it is correctly connected. Secondly, make sure the matrix straps are not set incorrectly. Finally, Fuse F2 maybe blown. Fuse F2 is located near the top edge of the base card, directly above the LEDs. Fuse F2 is plugged into positions A and B of receptacle J20. This is a 0.5 amp pico fuse.

Issue Can I change a 7792 controller to a 7793 controller? Environment I/NET site Cause How to change a 7792 controller to a 7793 controller Resolution Yes, you can. However, you have to do a memory clear with a HHC (Hand Held Console). Once this is done, define the controller as a 7793.

Issue Site scheduled a special day and the output did not function correctly.  Environment I/NET site Cause Site scheduled a special day and the output did not function correctly.  Resolution If you have a special day defined in a DCU, there must be a special day schedule (S1 through  S7) defined for ALL the time schedules and controller points in the DCU. If a time schedule does not have a special day schedule defined, the point will remain at it last commanded state until the special day period is over.

Issue Extending a special days period beyond the end of a year Environment I/NET site Cause Extending a special days period beyond the end of a year Resolution Special days cannot extend beyond the end of a year. If you have a single holiday period beginning in December and extending into January, you must create two special day periods. One to cover the time in December and one to cover the time in January.