Introduction
When a Series 90-30 line goes down, every hour of downtime costs money. The IC693CPU341T is the mid-range modular CPU that keeps those racks running: an Intel 80C188XL processor clocked at 20 MHz, 80 KB of user program memory, and room for 512 inputs and 512 outputs. Emerson now owns the line, but the hardware is the same GE Fanuc / GE Intelligent Platforms design that thousands of panels still rely on.
This revision T unit is a discontinued (end of sale) item, last verified 2026-09. That makes sourcing the practical question, not specification.
Key Parameters at a Glance
| Parameter | Value |
|---|---|
| Processor | Intel 80C188XL |
| Clock speed | 20 MHz |
| User program memory | 80 KB |
| Register memory (%R) | 9999 words |
| Discrete global memory (%G) | 1280 bits |
| Discrete I/O capacity | 512 inputs / 512 outputs |
| Serial ports | 1 |
| Supply voltage | 5 VDC (backplane) |
| Slot width | Single slot |
What the Numbers Mean on the Floor
The 80 KB program memory suits mid-sized logic programs — interlocking, sequencing, and moderate analog handling. The 9999 %R words give you generous register space for setpoints and data tables, while 1280 %G bits cover peer-to-peer discrete sharing. Because the CPU draws 5 VDC from the backplane, it occupies a single slot and needs no separate supply wiring.
Comparison: IC693CPU341T vs Other 90-30 CPUs
- IC693CPU341T — 80 KB user memory, 20 MHz, 9999 %R words, single slot.
- Entry-level 90-30 CPUs — smaller program memory, fewer %R words; fine for small relay-replacement logic only.
- Higher-tier 90-30 CPUs — more memory and I/O headroom, but larger footprint and higher cost.
The 341T sits in the middle: enough capacity for real process logic without paying for capacity you will never use.
Where It Fits
The single serial port and 5 VDC backplane design make this CPU a natural fit for standalone control of pumps, compressors, and packaged skids. In oil and gas service, a typical use is a mid-size wellsite panel running valve sequencing and alarm logic, where 512 discrete points cover the field devices and the %R registers hold timers and counters. Water treatment and material handling panels follow the same pattern.
Sourcing a Discontinued CPU
Because the IC693CPU341T is discontinued, availability depends on remaining stock rather than lead time. Before ordering, confirm the exact revision letter on your existing unit and verify lifecycle status with Oil AutoTech. If you are planning a longer-term fix, ask about replacement options for the rack at the same time — that avoids a second outage later.
For buyers running several 90-30 racks, holding one spare CPU is the cheapest insurance available. A single slot means it stores easily and swaps in minutes.
Practical Selection Checks
Verify these before you commit:
- Revision letter matches your application (this data covers revision T).
- Your program fits within 80 KB and your %R usage stays under 9999 words.
- Discrete point count stays within 512 in / 512 out.
- Backplane supply is the standard 5 VDC rail.
Oil AutoTech offers hands-on technical selection help, so send your rack list and program size and the team will confirm fit.
FAQ
Is the IC693CPU341T still in production?
No. It is discontinued (end of sale), last verified 2026-09. Availability depends on remaining stock.
How much program memory does it have?
80 KB of user program memory, plus 9999 %R words and 1280 %G bits.
How many I/O points can it handle?
512 discrete inputs and 512 discrete outputs.
What processor does it use?
An Intel 80C188XL running at 20 MHz.
How many slots does it take?
One single slot, powered from the 5 VDC backplane.
Contact Oil AutoTech today for pricing and availability.
