New Original Stock Honeywell 900C72R-0100-44 C70R Redundant CPU Module

Product Details

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Frequently Asked Questions (FAQ)

Q1: Does the 900C72R-0100-44 support redundant controller operation?
A: Yes. The module supports dual CPU redundant configurations with failover management. It requires a 900RR0-0001 redundant CPU rack and a 900RSM-0001 redundancy switch module for complete redundancy functionality.

Q2: What is the difference between the -43 and -44 revisions?
A: The 900C72R-0100-43 and 900C72R-0100-44 are different hardware revisions of the same C70R CPU class. They share the same functional role but may have firmware or minor hardware differences. For redundant CPU pairs, both modules should match exactly in revision and firmware build.

Q3: What communication interfaces does this module provide?
A: It features dual 10/100 Base-T Ethernet ports for network redundancy and host communication, plus RS-232/RS-485 serial interfaces supporting Modbus RTU protocol.

Q4: How does failover work between redundant CPUs?
A: The Lead Controller performs all primary tasks including I/O communication and host interfacing. If a fault is detected, failover transfers all primary tasks to the Reserve Controller. Failure detection and failover execute in 4 analog control cycles or less.

Q5: Can the CPU module be replaced while the system remains operational?
A: The module supports hot-swap replacement in properly configured redundant setups. The Reserve CPU can be replaced while the Lead continues running. The RSM may also be replaced under power.