When Mixed High-Voltage Loads Stall a Control Cabinet Upgrade
A system integrator was retrofitting a legacy packaging line. The existing relay panel had grown into a tangle of interposing relays, each one a potential point of failure. The goal was simple: drive sixteen mixed AC and DC field loads directly from a VersaMax rack without adding external relay banks. The missing piece was a module that could switch high-voltage circuits while keeping each channel electrically separate.
The GE IC200MDL940B answers that challenge. This VersaMax 16-point isolated Form A relay discrete output module gives engineers sixteen independently isolated outputs in a single slot. Originally developed by GE Fanuc / GE Intelligent Platforms and now owned by Emerson, it remains a practical building block for oil, gas, and industrial automation panels that need robust discrete control.
What the IC200MDL940B Delivers
Each of the sixteen Form A relay outputs is channel-to-channel isolated. That isolation matters in real panels: a fault on one field circuit cannot cascade into adjacent channels. The module accepts output voltages from 0-125 VDC (5/24/125 VDC nominal) and 0-265 VAC (120/240 VAC nominal), so one part number covers a wide range of pilot devices, solenoids, and indicator circuits.
Load capacity is 2.0 A per point for 5-265 VAC and 2.0 A for 5-30 VDC, dropping to 0.2 A for 31-125 VDC. Response time is 10.0 ms on and 10.0 ms off maximum, which suits general discrete control rather than high-speed pulse duties. The module draws 490 mA max at 5 V DC from the backplane and carries an IP20 protection rating.
Technical Specifications
| Parameter | Value |
|---|---|
| Channels | 16 relay outputs, Form A, isolated |
| Output voltage | 0-125 VDC (5/24/125 VDC nominal); 0-265 VAC (120/240 VAC nominal) |
| Load current per point | 2.0 A for 5-265 VAC; 2.0 A for 5-30 VDC; 0.2 A for 31-125 VDC |
| Isolation | Channel-to-channel, isolated points |
| Response time | 10.0 ms on / 10.0 ms off (maximum) |
| Backplane supply | 5 V DC |
| Backplane current | 490 mA max @ 5 V DC |
| Operating temperature | 0 to +60°C ambient |
| Storage temperature | -40 to +85°C |
| Relative humidity | 5 to 95% non-condensing |
| Protection rating | IP20 |
| Protection | No internal fuses or snubbers |
| Dimensions (H×W×D) | 66.8 × 110 × 50 mm (module body, excluding carrier) |
| Weight | ~0.18 kg |
Where It Fits in Oil, Gas, and Automation
In upstream oil and gas, this module can drive remote valve pilot solenoids and status lamps where AC and DC circuits share a cabinet. In midstream compressor stations, the isolated outputs help separate field wiring from control electronics, reducing noise coupling. In factory automation, the 16-point density saves rack space compared with discrete relay banks.
Because the outputs are isolated, maintenance teams can troubleshoot one channel without shutting down the whole card. That practical benefit keeps production moving and lowers the cost of every fault event.
Integration and Selection Notes
The IC200MDL940B mounts in a VersaMax rack and communicates through the backplane, so no separate fieldbus wiring is required at the module level. Before ordering, confirm your rack series, slot count, and carrier compatibility. The module has no internal fuses or snubbers, so external circuit protection should be planned according to your field load characteristics.
For hands-on technical selection help, Oil AutoTech supplies ready-to-ship spares for oil, gas, and industrial automation. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Official Emerson production status is unverified; the module is currently available in aftermarket channels (last verified: 2026-09).
