Building Automation Knowledge Base

Issue CALC is not an option in the DDC editor of a 7700 or 7716. Environment DDC Editor 7700 7716 Cause The Calculation module exists only in MR controllers and ASCs. Resolution Use the DCU or PCU Calculation editor. Refer to TCON 209 or TCON 237 for more details about Calculations and DDC modules.

Issue What is a Parent Point in a UC (Unitary Controller)? Environment Unitary Controller Cause Feature information Resolution A parent point is nothing more than the AO or DO point to which you add a UC extension: VAV, AHU, PID, FLT, or HPMP. The functioning of the extension is directly tied to the state of the parent point and the command pairing. Refer to TCON 209 or TCON237 for important details.

Issue What editing actually resides in the UC (Unitary Controller)? Environment UC (Unitary Controller) Cause Not all programming capabilities are available in all controllers. Resolution The following editors reside in the UC: Station parameters Control Commands Conversion Coefficients Resident I/O points Unitary control VAV-UC extensions AHU-UC extensions HPMP-UC extensions UC-PID extensions UC-FLT extensions Refer to TCON 209 or TCON 237 for important details.

Issue What is the difference between an Internal Analog Input (AI) and Pulse Input (PI) when it comes to fractional digits? Environment I/NET 7700 Cause It is not always clear the difference between Internal AIs and PIs when it comes to fractional digits. A clarification note will be added to the next release of the I/NET 7700 Operator Manual, but until then, please adhere to the following when you want to display fractional digits for either Internal point types. Resolution Internal Analog Inputs (AIs) Internal AIs are limited to a maximum value of 2 16 (65535). Internal AIs fractional digits are a direct result of the M value in the conversion coefficient table. If you want to display a value in hundredths (x.xx) the M must be .01 and the B=0 and the highest number to be displayed is 655.35. If you want a number to display a value in tenths (x.x) the M must be .1 and the B=0 and the highest number possible is 6553.5. Internal Pulse Inputs (PIs) Internal accumulators can accumulate not only pulses but analog values as well, but when it comes to fractional digits Internal PIs are completely different from Internal AIs. PIs are a floating point type number. This means there is no limit to the magnitude or the number of fractional digits, except that only 6 significant digits may be displayed at any one time. Therefore, the fractional digits are not ruled by the number of decimal places of the M value in the conversion coefficient table. In fact, for a Internal PI to work properly, you must utilize a conversion coefficient pair of M=1 and B=0. An Internal PI with a calculation of P0+P1, where P0 and P1 are External AIs with values of 34.1234 and 72.5678, would be able to display the 4 decimal places with no trouble. In fact, if you used a conversion coefficient of M=.0001 and B=0 for the Internal PI, and the AIs never changed their value, the Internal PI calculation would start rounding off the value every calculation. This rounding effect would in fact be shown by the value of the Internal PI getting smaller and smaller with every scan of the Internal PI. Remember, for a Internal PI to work properly, you must utilize a conversion coefficient pair of M=1 and B=0.

Issue How I/NET 2.3X has the ability to designate a particular host to do an automatic restore Environment I/NET site Cause How I/NET 2.3X has the ability to designate a particular host to do an automatic restore Resolution Go to the host’s Network Configuration/Link Summary. Highlight the desired row. In that row you will find a column labeled “R/H”. This stands for Restore-Host. Modify this row. In the Restore Host prompt, place the same host number you entered in the host’s active Configuration Profile. (Don't forget to make sure that host has current save files!)

Issue Are there resources for configuring a 7750 Building Manager? Product Line TAC INET Environment I/NET site Cause The Building Manager (BM) is based on a zoned programming approach. Zones are groups of points in a system which control related equipment. A good example of a zone would be a group of points that control the lighting, heating and air conditioning for a tenant that occupies 1 floor in a multi-story building. The major function of the building manager is to give the tenant control over this equipment (through a user friendly telephone interface) and to be able to accumulate statistics to be used for billing normal and after-hours energy usage. Resolution Good sources: TCON098 TCON209 (7-28 through 7-38) TCON237 (7-28 through 7-39) Tech Tip 038

Issue Set up a two wire LTS80 Lini-Temp sensor on a 7740 and 7741 DCU. Environment 7740 DCU 7741 DCU LTS80 Lini-Temp sensor Cause Conversion coefficients must be set properly for correct reading of temperatures. Resolution For Fahrenheit: M = 0.17582 B = -279.4 For Centigrade: M= 0.09768 B = -173.0 Refer to TCON 097 for 10K resistor placement

Issue How can I view the routing table on a host that is part of a network using TCP/IP? How can I remove entries in the host's routing table? Environment I/NET Host IP Network Cause Troubleshooting IP communication often involves viewing the current routing tables at a host station. This will help determine if they need to be cleared. Resolution View the Host Routing Tables  Go to Start > Run > and type "cmd" to open a DOS screen Type "route print" and hit Enter Delete an entry from the Host Routing Tables Example to delete address 157.0.0.0: Go to Start > Run > and type "cmd" to open a DOS screen Type the following: route delete 157.0.0.0 and hit Enter Type "route print" and hit Enter. This address should not appear. 

Issue Limit what is available to the user on a dedicated I/NET host on the Ethernet. For example, I do not want the user to be able to get to a DOS prompt then modify the Routing Table. Environment I/NET site Cause Limit what is available to the user on a dedicated I/NET host on the Ethernet. For example, I do not want the user to be able to get to a DOS prompt then modify the Routing Table. Resolution This can be done. Remove the DOS icon from Windows. Or, it may be better to edit the permission rights of the user.

Issue On Screen Indication of a Telnet session into a NPR Environment Telnet NPR Cause Indicating to the user when a telnet session has been initiated into an NPR. Resolution "CSI NetPlus Router Telnet Server" "Connected to remote NPR” (Name of the NPR) followed by version number, build, and date "Type help for a list of commands"

Issue How to add entries in the host’s routing table Environment Command Prompt Cause Routing Table Errors Resolution As an example: add the address 157.0.0.0 Go to a DOS screen and type the following: Route add 157.0.0.0 Then type: Route Print This address should appear.

Issue Site has a I/NET 2000 PCU set as an 06 TAP for ADAA, and the PCU has a synchronous EPROM and synchronous BIN file loaded. Do they need to change the EPROM and BIN file to Asynchronous if they install an integrated dial modem on the serial port of the same PCU? Environment I/NET site Cause Site has a I/NET 2000 PCU set as an 06 TAP for ADAA, and the PCU has a synchronous EPROM and synchronous BIN file loaded. Do they need to change the EPROM and BIN file to Asynchronous if they install an integrated dial modem on the serial port of the same PCU? Resolution No, but you do need to use the correct modem, cables, settings, profiles, etc.

Issue The Process Control Unit (PCU) is set as a 06 TAP. Will it still function as a 01 TAP? Environment I/NET site Cause The Process Control Unit (PCU) is set as a 06 TAP. Will it still function as a 01 TAP? Resolution Yes, by design the 78010 TAP emulation is still functional.

Issue Site has I/NET 2000 PCU set as an 06 TAP for ADAA, and PCU has a synchronous EPROM and ASYNCHRONOUS BIN file loaded Environment I/NET site Cause Should the site change the EPROM? Resolution We strongly recommend you do. If the PCU goes to “Boot-State”, the SYNCHRONOUS EPROM in the PCU will not reset the asynchronous ADAA modem correctly. You won’t be able to dial into the ADAA port of this controller until this is corrected by doing a download or changing the EPROM.

Issue Add a stand-alone 7798 to the existing controller LAN Environment I/NET site Cause How to add a stand-alone 7798 to the existing controller LAN Resolution A CLX card is required. Refer to TCON 138.

Issue I never reset the "Sync" LED on the FOI after I corrected the line fault on the output of the CRR. Will this cause any communication problems? Environment I/NET CRR Cause Line Fault Resolution Reset the sync LED If you can NOT extinguish the Sync LED you should find the fault. Leaving this light “on” does not cause communication problems.

Issue ADAA problems: can not dial in or out of the site A PCU is set up as a 06 TAP. The RX and TX LEDs are flashing on the RS-232 card. A CBL048 cable is connected from the RS-232 card to the modem. The RD and SD lights are flashing. Environment ADAA Cause The wrong BIN file is in the PCU. Resolution You have the wrong BIN file in the PCU. If the PCU is at the “Boot State”, you may have the wrong EPROM too. Install the correct BIN file; and it is strongly recommend to put in a compatible Asynchronous EPROM.

Issue Controlling AC relays from analog outputs on the motherboard or expansion board of the 7718 PCU Environment I/NET Site Cause Controlling AC relays from analog outputs on the motherboard or expansion board of the 7718 PCU Resolution The outputs from these locations are DC. This may cause the AC relays to “chatter” or not work at all. It is recommended to use a P8UI8DO at the expansion board or place DC powered, form “C” contacts, pilot relays on the outputs of the PCU. Refer to TCON106 for more details.

Issue Door show Deny Entry Schedule after deleting a special day schedule on the special day Environment I/NET Access Control Cause The process to execute the Special Day begins at midnight on the first day of the duration, and ends at the end of the last day of duration. If you delete the Special day while it is running you will get denied entry. Resolution Do not Delete special Day schedules on special days Modify the special day schedule to match the desired access control results. On the next non-special day, Delete the schedule If you have already deleted the special Day or special Schedule Option A - Delete the special day from the Host and the Controller     Perform a station restore to force the controller to use the current programming Option B - Determine which special day schedule type the controller is operating on Modify or create a schedule for that special day with the desired access privileges On the next non-special business day, enter the desired programming for special days.

Issue Docutrend data import fails while connected to a physical 78010 tap. Environment I/NET site Cause Docutrend data import fails while connected to physical 78010 tap. Resolution The system or hardware number in your active profile is different compared to the 78010 tap. Change the profile to match the site 78010 tap.