Communication Guide, ©ComAp – March 2014 71
IGS-NT Communication Guide 03-2014.pdf
I-CR-R Module for CAN Bus Redundancy
This module is intended to provide CAN bus redundancy in applications where IG/IS-NT controllers
are placed in several switchboards that need to be interconnected by the CAN bus communication line
and where there is essential to keep the line working. As a side effect, the module also provides the
CAN bus line extension.
As the CAN bus provides data exchange needed for Load Sharing and VAr Sharing and also for
Power Management features, it’s redundancy can be very important in complex systems with more
engines, more mains incomers.
The module is based on I-CB/CAT GAS HW. This HW needs to be bought and then it’s standard FW
replaced with I-CR-R FW obtained from ComAp Download Center. Also, for the replacement of the
FW, you will need the FlashProg utility which can be downloaded in Peripheral Modules Upgrade
Package here: http://www.comap.cz/support/download-center/type/software/. Chapter related to I-CB
reprogramming is to be used.
Hint:
I-CR-R may be used as a redundancy module for a maximum of 20 controllers (counted all controllers
on the CAN2 bus).
For usage I-CR-R in an installation of more as 20 controllers please contact our technical support for
another redundancy solution.
Typical case – several controllers, each one in separate switchboard:
Firmware is OK and running
Firmware corrupted (periodic Watchdog reset)
CAN A communication is running
CAN A communication speed autodetection is in progress (I-CR
automatically enters this mode if no CAN message received for 2 s)
CAN B communication is running
CAN B communication speed autodetection is in progress (I-CR
automatically enters this mode if no CAN message received for 2 s)
RS232/422 interface activity
INT CAN RS485
I-CR-R (1)
LOCAL CAN
INT CAN RS485
I-CR-R (2)
LOCAL CAN
INT CAN RS485
I-CR-R (N-1)
LOCAL CAN
INT CAN RS485
I-CR-R (N)
LOCAL CAN
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