Product Core Brief
- Model: 07KT93
- Brand: ABB
- Series: Procontic CS31 (legacy distributed automation)
- Core Function: Executes ladder logic, PID loops, and system communication for a Procontic CS31 station.
- Product Type: PLC CPU / central processing unit
- Key Specs: 24 VDC supply | 24 digital inputs / 16 transistor outputs (0.5 A) | 14K flash EPROM, RS-232 ×2, RS-485 bus
- Condition: New Original / New Surplus (confirm at checkout)
Caution: this part number is documented badly across the channel. Some sellers list it as a bus termination module, others as a DO620 output card. The Procontic CS31 CPU listing is the most consistent — but confirm your nameplate and full order code (GJR5251300R0171 / R0101 variants exist) before you buy.
Product Introduction
The ABB 07KT93 is a CPU module for legacy Procontic CS31 systems. It runs the program, handles I/O scanning, and manages serial communication.
It carries 14K of flash EPROM and a 10 kHz high-speed counter. That memory ceiling matters — a program expanded on a newer station may not fit back onto this one.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | 07KT93 |
| Brand | ABB |
| Order Code | GJR5251300R0171 (verify against nameplate) |
| Module Type | CPU / central processing unit |
| Compatible System | ABB Procontic CS31 |
| Supply Voltage | 24 VDC |
| Digital Inputs | 24 × 24 VDC |
| Digital Outputs | 16 × 24 VDC, 0.5 A transistor |
| Program Memory | 14K flash EPROM |
| Communication | 2 × programmable RS-232, RS-485 system bus |
| Counter Speed | 10 kHz high-speed counter |
| Functions | Real-time clock, PID, data handling |
| Condition | New Surplus / Tested Used |
Quality Control Process
CPU boards get a different protocol than I/O cards. Five steps.
- Nameplate and visual audit. Order code, EPROM label, capacitor condition, connector pin integrity.
- Battery and memory check. Backup battery voltage measured with a Fluke multimeter; RAM retention tested over a 24-hour power-off cycle.
- Program load test. Booted in a live CS31 rack; EPROM read verified byte-for-byte against the source listing.
- I/O and comms validation. 24 VDC injected on inputs, outputs read back; RS-232 and RS-485 ports exercised with a loopback test.
- ESD packaging. Anti-static bag, desiccant, foam box, connector caps.
Test records and an EPROM checksum ship with the unit.
Replacement Pitfall Guide
Four traps specific to legacy CPU swaps.
❗ Order code mismatch. 07KT93 appears under several GJR suffixes. Same short code, different revision. Match the full code.
❗ Program memory overflow. Newer logic compiled elsewhere may exceed 14K. Confirm program size before the swap.
❗ Battery-dead configuration loss. Remove the old unit without a fresh backup and the program may not survive. Back up first, every time.
❗ I/O mapping drift. Output current ratings differ across revisions. A 0.5 A channel driving a heavier load fails on first energization.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor | Compatibility | Migration Notes |
|---|---|---|---|
| 07KT93 | 07KT93 (same order code) | Direct | Match GJR suffix and EPROM version |
| 07KT93 | 07KT93 (different GJR suffix) | Needs Adaptation | Revision may differ; verify program compatibility |
| 07KT93 | AC 800M / AC 500 series CPU | Needs Adaptation | Full program conversion and hardware redesign required |
- Program memory: 14K flash EPROM
- High-speed counter: 10 kHz maximum
