GE Fanuc IC655CCM500 / IC655CCM590 Series Five Communications Hardware
A CCM2 protocol communications module paired with an external RS-232/RS-422 adapter, isolator and repeater.
Shared Role, Then Model Differences
IC655CCM500 is the active Series Five serial communications module. It presents one logical port through RS-232C and RS-422 connectors and communicates with devices using the GE Fanuc CCM2 protocol.
IC655CCM590 is not another PLC slot module. It is an external adapter that converts and isolates RS-232/RS-422 signals, expands multidrop capability and can repeat an RS-422 link for another 4000 ft.
Common Specifications and Model-Specific Data
Module and Adapter Are Complementary
The CCM500 owns protocol communication; the CCM590 changes the electrical link. Troubleshooting must separate PLC configuration from cable, conversion, isolation and termination.
IC655CCM500
Check ONLINE/OFFLINE state, master role and message activity.
IC655CCM590
Check power, interface direction, isolation and repeater placement.
Link
Check pinout, shield, termination and distance.
Records to Preserve Before Removal
Step 1
Save baud, parity, station identity, master/slave role and message logic.
Step 2
Draw the actual RS-232/RS-422 cable and adapter topology.
Step 3
Replace the CCM500 or CCM590 in its correct physical role.
Technical Questions
What is the main difference between IC655CCM500 / IC655CCM590?
IC655CCM500 is the PLC communications module; IC655CCM590 is an external signal adapter, isolator and repeater.
How far can RS-232 run directly with IC655CCM500 / IC655CCM590?
The manual gives a normal direct RS-232 distance of 50 ft (15 m) for the CCM link.
How does IC655CCM590 extend IC655CCM500 / IC655CCM590?
Used as a repeater, it can regenerate RS-422 signals for another 4000 ft (1200 m).
Does IC655CCM590 replace IC655CCM500 in IC655CCM500 / IC655CCM590?
No. It supports the electrical path; it does not provide the Series Five slot module’s CCM2 protocol function.
Which settings matter for IC655CCM500 / IC655CCM590?
Retain baud rate, framing, master/slave role, device IDs, message logic and interface type.
What proves a successful IC655CCM500 / IC655CCM590 repair?
Stable online status and correct end-to-end application messages must be demonstrated at the intended baud and distance.
Long-Term Customer Communication
Clear communication and responsible follow-up support continued business after the first enquiry and order discussion.
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