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The ABB 88FT05C‑E (GJR2391100R1200 / GJR2393100R1200) coupling module is designed to enable reliable communication between bus systems in ABB’s control system
architecture. It does not appear to be a simple I/O module but rather a “coupling” or “interface” module linking different network segments/buses.
When specifying or replacing this module, exact part number, bus architecture and compatibility are crucial.
Q1: What exactly is this module’s purpose?
A: The module serves as a coupling/interface between a station bus (or local rack bus) and a remote or secondary bus system. In effect, it bridges communication between two network segments so
that different parts of the automation system can exchange data. For example: “connects separate control networks… station
bus and remote bus.” Thus, it is essential for distributed system architecture where multiple bus levels exist.
Q2: What is the difference between GJR2391100R1200 and GJR2393100R1200?
A: In the documentation I found, the module more commonly appears as “GJR2393100R1200 88FT05C‑E”. The mention of GJR2391100R1200 may be a typographical variant or earlier
revision. Because of these mismatches, you must confirm the exact variant in your system (check the module label on your rack).
The supplier listing uses “GJR2393100R1200” in all their descriptions.
Thus: treat any module with “88FT05C‑E” designation
carefully, check labels, and match exactly.
Q3: Why is the coupling module crucial and what happens if it fails?
A: Because this coupling module links bus segments, failure can cause communication breakdown between control station and remote bus, leading to loss of data,
I/O communication errors, or system faults. Therefore it’s a critical component for system integrity.When installing a new or replacement
module: ensure system is in safe state, backup your configuration, verify communication paths
after installation, and observe status LEDs/diagnostics of
the coupling module.
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| TPS02 | SAFT121PAC SAFT 121 PAC | IMDSI22 |
| FS450R17KE3/AGDR-71C | SAFT112POW SAFT 112 POW | DI685 3BDS005833R1 |
| CI531 3BSE003825R1 | XI16E1 1SBP260100R1001 | DO620 3BHT300009R1 |
| C100/0200/STD | DSMB144 57360001-EL | SNAT630PAC SNAT 630 PAC |
| SPNPM22 | DSQC639 3HAC025097001 | SPDSI14 |
| CI857K01 3BSE018144R1 | BRC-100 P-HC-BRC-10000000 | SPDSO14 |
| 07KT92 GJR5250500R0262 | DSTK150 26390603-A | NGDR-02C |
| IMMFP12 | DSRF182 57310255-AL | PHARPS32200000 |
| DSQC679 3HAC028357-001 | CI590 3BHT340092R1 | PHARPS62200000 |
| DSQC500 3HAC3616-1 | IMSED01 | DSQC334 3HAB5845-1 |
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