Description
ABB 07DC91C GJR5251400R0202 | AC31 Digital I/O Module | CS31 Slave
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Type Designation | 07DC91 |
| Common Hardware Marking | 07DC91C |
| Product ID | GJR5251400R0202 |
| Product Type | Digital I/O module |
| System | Advant Controller 31 / AC31 |
| I/O Combination | 16DI / 8DO / 8DC |
| Digital Inputs | 16 |
| Digital Outputs | 8 |
| Configurable Digital I/O | 8 |
| Input Voltage | 24 VDC |
| Output Voltage | 24 VDC |
| Maximum Output Current | 0.5 A |
| Fieldbus Interface | CS31 Slave |
| Interface | RS-485 / CS31 |
| Wiring | 1-wire |
| Mounting | DIN rail |
| Supported Rails | TH35-15 and TH35-7.5 |
| Protection Rating | IP20 |
| Operating Temperature | 0 to +55°C |
| Storage Temperature | -25 to +75°C |
| Maximum Operating Altitude | 2000 m |
| Dimensions | 120 × 140 × 85 mm |
| Approx. Net Weight | 1.07 kg |
ABB’s published AC31 replacement documentation specifically records GJR5251400R0202 / 07DC91 with the original 16DI/8DO/8DC I/O combination. ABB also identifies the newer 07DC91-AD as its replacement device.
Product Introduction
The ABB 07DC91C GJR5251400R0202 is a mixed digital I/O module for the legacy Advant Controller 31 (AC31) platform. It provides 16 digital inputs, 8 digital outputs, and 8 configurable digital I/O points, with the module operating as a CS31 slave on the AC31 distributed I/O architecture.
For replacement work, the important point is that this is an AC31-specific I/O device, not a general-purpose 24 VDC PLC I/O card. ABB’s current retrofit documentation confirms that the original 07DC91 can be replaced by 07DC91-AD, but the replacement does not reproduce every legacy feature exactly.
07DC91C
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The 07DC91C is usually encountered in older installations where the I/O architecture has been in service for many years. The most common procurement mistake is to match only the 24 VDC supply and channel count while overlooking the CS31 bus architecture and exact I/O combination.
Typical Applications
- ABB Advant Controller 31 / PLC systems
- Distributed digital field I/O
- Motor start/stop and contactor control
- Limit switches, proximity sensors, interlocks, and status feedback
- Legacy machine and process-control installations requiring I/O replacement
Technical Pitfalls to Avoid
- Do not confuse 07DC91 with 07DC92.
ABB’s replacement table lists 07DC91 as 16DI/8DO/8DC, while 07DC92 is a different 32-channel configurable digital I/O module. The two should not be treated as interchangeable. - CS31 compatibility is mandatory.
The module is a , so replacing it with a physically similar 24 VDC digital I/O module without support will not solve the system-level communication requirement. - Check the replacement device’s functional differences.
ABB identifies 07DC91-AD, part number 1SAP800300R0010, as the modern replacement. Its supported configuration is 16DI/16DC rather than the original 16DI/8DO/8DC, and ABB notes that the local test button is not provided and only basic diagnostics are supported. - Verify the output load before substitution.
The original 07DC91 specification identifies the digital outputs as 24 VDC with 0.5 A output capability. Check the actual field load, interposing relays, solenoids, and protection arrangement before replacing the module.
Related Products
- ABB 07DC91-AD — 1SAP800300R0010 — Current adapter replacement for the original 07DC91; supports 16DI/16DC but has functional differences from the legacy module.
- ABB 07DC92 — GJR5252200R0202 — 32-channel configurable digital I/O module; different I/O architecture from 07DC91.
- ABB 07AI91 — GJR5251600R0202 — analog I/O module supporting voltage/current, PT100 and thermocouple inputs; not a substitute for the digital 07DC91.
- ABB 07AC91 — GJR5252300R0101 — configurable analog/AC I/O module with a different signal architecture.
- ABB 07KT98 — CPU/controller family used with distributed I/O.
- ABB Bus — The field I/O communication architecture used by the 07DC91 as a slave.
Procurement Check
Before approving an ABB 07DC91C GJR5251400R0202, verify:
- Exact type designation: 07DC91
- Hardware marking: 07DC91C
- Product ID: GJR5251400R0202
- Existing controller/master
- bus configuration
- 16 digital inputs required
- 8 digital outputs required
- 8 configurable digital I/O required
- 24 VDC field voltage
- 0.5 A maximum output requirement
- Existing terminal wiring and connector arrangement
- DIN rail installation
- Application firmware/software and I/O configuration
- Whether a legacy module or ABB’s 07DC91-AD replacement is acceptable
Recommended procurement description:
ABB 07DC91C Advant Controller 31 Digital I/O Module, 16DI / 8DO / 8DC, 24 VDC, 0.5 A Digital Outputs, Slave, DIN Rail Mount.
The key distinction is that 07DC91C is a legacy ABB distributed digital I/O module, not a CPU and not a generic modern PLC I/O card. ABB’s own retrofit documentation confirms the original configuration and provides 07DC91-AD as the replacement path, but the newer adapter has documented functional differences that should be reviewed before a field swap.
