Communication Guide, ©ComAp – March 2014 74
IGS-NT Communication Guide 03-2014.pdf
visible to the customers. By sending this message, I-CR-R is “cheating” the controllers in it’s local
CAN bus because it is pretending to be one of the other controllers (from intercontroller bus) sending
this message. Do not use the real source for SHBOUT6 message if this feature is enabled.
Contents of the SHBOUT6 message:
Position (bit 8 = highest)
Logical 1: Modbus Master (controller with adress 1 on the line) is detected
RS485 overload occurred (= more data in the queue than could be
transmitted via this line)
Logical 1: indicates this (local) controller is Modbus Master
Difference of “visible” controllers between Primary and Backup bus
occurred -> Probably failure in one of the intercontroller lines
Note 1: Typically, configure a Warning-type protection on the lowest bit signal of this message. The
signal becomes active if part of controllers normally “visible” through the Primary or Backup bus is not
visible anymore; this means the cable was cut or shorted or otherwise damaged and doesn’t connect
anymore some part or all the controllers.
Note 2: Because bit 1 activates with the difference between Primary and Backup buses it is able to
indicate failures of both Primary and Backup buses, so even if Primary bus works fine, it is able to
show the problem with Backup bus to allow the technician to repair it before it actually becomes a
problem. Otherwise the problem with the Backup bus would stay hidden until Primary bus would have
failed and then the intercontroller communication would stop working completely.
I-CR-R indication and diagnostic LEDs:
If all other LEDs except of the PWR LED are dark the FW is located in
a wrong type of module; please make sure that I-CB/CAT GAS HW is
present
If all LEDs are dark there is no power supply to the module
Firmware is OK and running
Firmware corrupted (periodic Watchdog reset)
RS485 was interrupted or no master found on RS485 backup bus;
(controller with address 1 must be presented in the system to make
backup bus working)
Local CAN bus is running OK (between controller and I-CR-R)
No controller detected on local CAN bus;
on local bus, speed 32C is always expected (short connection only –
within the switchboard)
communication on CAN bus between I-CR-Rs is running
CAN bus between I-CR-Rs was interrupted
Automatic speed detection 32C / 8C; enters this mode if no
controller/transmission detected on Primary intercontroller bus (for 2 s)
Local CAN interface activity
Primary intercontroller CAN interface activity
Backup intercontroller RS485 interface activity
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