Description
Hard-Numbers: Technical Specifications
Identical to base IC694MDL740—all specs carry forward:
- Rated Voltage: 12/24 VDC
- Output Voltage Range: 12 to 24 VDC (+20%, -15%)
- Output Current: 0.5A maximum per point; 2A maximum per common terminal
- Inrush Current: 4.78A for 10ms
- On Response Time: 2ms maximum
- Off Response Time: 2ms maximum
- Off-State Leakage: 1mA maximum
- Output Voltage Drop: 1V maximum
- Isolation (Field to Backplane): 250VAC continuous; 1500VAC for 1 minute (optical)
- Isolation (Group to Group): 250VAC continuous; 1500VAC for 1 minute
- Backplane Power Draw: 110mA @ 5VDC (all outputs energized)
- Operating Temperature: 0°C to +60°C (+32°F to +140°F)
- Weight: 0.69 lbs (0.31 kg)
- Hot-Swap Support: Yes (RX3i Universal Backplane)
GE IC694MDL655
The Real-World Problem It Solves
You’ve got a blown output module on a running system, and the procurement guy hands you a box labeled IC694MDL740A instead of the IC694MDL740 you ordered. The machine is down. You don’t have time to dig through revision notes. The question is simple: will this thing work, or do you need to hunt down the exact part number?
Where you’ll typically encounter it:
- Spare parts inventory carrying mixed revision stock (A, B, C variants)
- Emergency replacements where the distributor ships the current revision
- Legacy system maintenance where the original IC694MDL740 is no longer in production
Bottom line: The “A” suffix is a hardware revision marker. Functionally, it’s the same card. Plug it in and move on.
Hardware Architecture & Under-the-Hood Logic
The IC694MDL740A is a hardware revision of the base IC694MDL740. The “A” suffix indicates a Series A manufacturing update—typically driven by component sourcing changes, PCB layout optimizations, or production process improvements. GE and Emerson use this naming convention across their RX3i product line to track hardware generations without changing the base model number.
What changed in Revision A:
- Internal component updates – MOSFET output drivers, optical isolators, or supporting passives may have been sourced from different suppliers or updated to newer-generation parts with improved reliability.
- PCB layout refinements – Trace routing or thermal management improvements to reduce hot spots or improve manufacturability.
- Manufacturing process changes – Updated assembly procedures or testing protocols implemented during production.
What did NOT change:
- Output current ratings (0.5A per point, 2A per common)
- Response times (2ms on/off)
- Isolation specifications
- Terminal block wiring and pinout
- Backplane communication protocol
- LED indicator behavior
- Module ID recognized by RX3i CPU
The CPU sees the module as IC694MDL740—there is no separate firmware or configuration required for the “A” revision.
GE IC694MDL655
Field Service Pitfalls: What Rookies Get Wrong
Assuming the “A” Suffix Means a Feature Upgrade
The letter suffix trips people up. In some product lines, “A” means “enhanced” or “improved features.” Not here. In GE/Emerson RX3i discrete I/O modules, the suffix tracks hardware revisions only—no new capabilities, no additional diagnostics, no expanded ratings. It’s the same module built with different components or processes.
Field Rule: Treat IC694MDL740A as identical to IC694MDL740 for all wiring, configuration, and troubleshooting. If you wouldn’t ask questions about an , don’t ask about the A revision.
Confusing Revision A with Firmware or Software Versions
Rookies sometimes assume the “A” indicates a firmware version that requires a CPU update or Proficy project change. The module has no onboard firmware—it’s a passive output switch array controlled by the CPU. The revision applies strictly to the hardware layer.
Quick Fix: No action required. The RX3i CPU doesn’t distinguish between and IC694MDL740A. Both report the same module ID and accept the same configuration.
Mixing Revisions in the Same Rack
Some shops get nervous about mixing , IC694MDL740A, IC694MDL740B, and IC694MDL740C in the same control system. There’s no technical reason to avoid this. Each revision is backward- and forward-compatible. You can run a rack with three original modules and one IC694MDL740C without issue.
Field Rule: Replace failed modules with whatever revision is available. Don’t hold up a startup waiting for a specific suffix.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
