GE IC694MDL753
GE IC694MDL753
GE IC694MDL753
GE IC694MDL753
GE IC694MDL753

GE IC694MDL758 | 32-Point ESCP Output Module for RX3i – Field Service Notes

  • Model: IC694MDL758
  • Alt. P/N: IC694MDL758-AA (Series AA, Revision AA)
  • Product Series: PACSystems RX3i (GE Fanuc / Emerson Automation)
  • Hardware Type: 32-Point DC Sourcing Output Module with Per-Group ESCP
  • Key Feature: Group-level electronic short circuit protection—trips entire group on fault, auto-recovers when cleared
  • Primary Field Use: High-density output applications where group-level fault isolation is acceptable and cost matters more than per-point protection
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Part number: GE IC694MDL758
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Description

Hard-Numbers: Technical Specifications

  • Output Points: 32 discrete outputs (2 isolated groups of 16)
  • Rated Voltage: 12/24 VDC nominal
  • Output Voltage Range: 10.2 to 28.8 VDC
  • Output Current: 0.5 A per point
  • Group Current Limit: 8 A maximum per group without ESCP trip
  • Inrush Current: 5.4 A for 10 ms without ESCP trip
  • Response Time: 0.5 ms ON, 0.5 ms OFF
  • Backplane Power: 250 mA maximum from 5V bus
  • External Power Supply: Isolated 12-24 VDC required; 33 mA/group at 24VDC, 20 mA/group at 12VDC
  • Isolation: 250 VAC continuous / 1500 VAC for 1 minute (field to backplane); 50 VAC continuous / 500 VAC for 1 minute (group to group)
  • Operating Temperature: 0°C to 60°C
  • Terminal Block: IC694TBB032 (box) or IC694TBS032 (spring), sold separately
  • CPU Requirement: RX3i CPU firmware 7.70 or greater; Proficy Machine Edition 7.50 SIM 2 or later
  • Hot Swap: Supported
GE IC694MDL753

GE IC694MDL753

The Real-World Problem It Solves

You need 32 outputs in one slot, but don’t want to pay for per-point protection. The MDL758 gives you group-level ESCP at a lower cost than the MDL754’s per-point protection. If one output shorts, the group trips—but that’s acceptable in applications where losing 16 outputs temporarily is less expensive than the premium for per-point isolation.

Where you’ll typically find it:

  • Valve manifolds where group shutdown doesn’t create safety hazards
  • Indicator light banks and non-critical discrete control
  • Packaging machinery with redundant output paths

Bottom line: It’s the budget-conscious alternative to MDL754 when group-level fault tolerance is acceptable for your process.

 

Hardware Architecture & Under-the-Hood Logic

This is a sourcing (positive logic) output module with group-level current monitoring. Unlike MDL754 which protects each output independently, MDL758 monitors current at the group common—any fault trips all 16 outputs in that group.

Signal flow and protection logic:

  1. CPU writes 32 output bits via backplane (27 MHz PCI bus)
  2. Optocouplers isolate field wiring from backplane logic
  3. Each group of 16 outputs shares a common current sensor
  4. MOSFET drivers switch positive side of load
  5. If total group current exceeds trip threshold, entire group shuts down
  6. ESCP fault LED turns red for that group; fault bit sent to CPU
  7. Other group continues operating independently
  8. When fault clears (short removed), group auto-recovers to previous state

Diagnostic data:

  • 16 input bits report status to CPU
  • Bits include: field power status per group, ESCP fault per group
  • No per-point fault reporting—only group-level

Key difference from MDL754:

  • MDL754: Per-point ESCP, 0.75A/point, Hold Last State option, higher group isolation (250VAC)
  • MDL758: Per-group ESCP, 0.5A/point, no Hold Last State, lower group isolation (50VAC), lower backplane draw (250mA vs 300mA)
GE IC694MDL753

GE IC694MDL753

Field Service Pitfalls: What Rookies Get Wrong

ESCP Trips All 16 Outputs in the Group

When one output shorts, the entire group goes down. Technicians expect only the faulted output to trip (like MDL754), but this module protects at the group level. You lose 16 outputs until you find and clear the fault.

  • Field Rule: If per-point isolation is critical for your process, use . If you’re okay with group-level shutdown, MDL758 saves money. Don’t mix expectations.

Lower Group-to-Group Isolation (50 VAC vs 250 VAC)

Group isolation on MDL758 is 50 VAC continuous (500 VAC for 1 minute). offers 250 VAC continuous. If you’re running mixed voltage groups (12V and 24V) with different ground references, the lower isolation increases cross-group interference risk.

  • Quick Fix: Use the same voltage level on both groups, or ensure both supplies share the same ground reference. Don’t mix floating and grounded supplies across groups.

Terminal Block Not Included

Same as —the terminal block (IC694TBB032 or IC694TBS032) ships separately. Technicians order the module and get stuck on commissioning day.

  • Field Rule: Add the terminal block to your purchase order. Spring clamp (TBS032) is faster; box style (TBB032) is more vibration-resistant. Stock spares.

CPU Firmware Requirement (7.70 or Later)

MDL758 requires RX3i CPU firmware 7.70 or greater and Proficy Machine Edition 7.50 SIM 2 or later. Older CPUs will detect the module but won’t configure it correctly.

  • Field Rule: Verify CPU firmware before specifying. If upgrading from MDL753 (which works with earlier firmware), confirm the CPU supports .

 

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.

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