IC670MDL740
IC670MDL740
IC670MDL740
IC670MDL740
IC670MDL740

GE IC670MDL740K | 16-Point 12/24VDC Positive Logic Output – Field Service Notes

  • Model: IC670MDL740K (Revision K variant of IC670MDL740)
  • Product Series: GE Fanuc Field Control (now Emerson)
  • Hardware Type: 16-Point Discrete DC Output Module
  • Key Feature: Single-group positive logic (sourcing) outputs with common 5A fuse protection
  • Primary Field Use: Drives low-current DC loads such as indicator lamps, relay coils, solenoid valves, and pilot devices in distributed I/O stations
  • Revision K Specifics: Standard production revision; electrically equivalent to base IC670MDL740 module
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Part number: GE IC670MDL740K
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Description

Hard-Numbers: Technical Specifications

  • Protocol Support: Genius Bus (IC670GBI002) / Profibus Interface Unit
  • Port Count: 16 discrete outputs (single group, no inter-point隔离)
  • Output Voltage: 9.2–29.5 VDC (user input 10–30 VDC, 24 VDC nominal)
  • Output Current: 0.5 A max continuous per point; 4 A max total per module
  • Inrush Current: 2 A max per point for 100 ms
  • Output Voltage Drop: 0.5 V max
  • Output Leakage Current: 0.5 mA max at 30 VDC off-state
  • Minimum Load Current: 1 mA per point
  • Response Time: 200 µs max on/off with 0.5 A resistive load
  • Isolation Rating: 1500 VAC for 1 min (user terminal to logic/frame ground); 250 VAC continuous
  • Power Draw from BIU: 111 mA max
  • Fuse Protection: 5 A, 5×20 mm, 250 V slow-blow fuse (common to all outputs)
  • Undervoltage Monitor: Rev K同样监控低于9.8 VDC触发故障
  • Wire Size: AWG #14–22 (one wire) or AWG #18 (two wires) per terminal
  • Operating Temperature: -40°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Relative Humidity: 5% to 95% non-condensing
  • Certifications: UL listed, CE compliant
    IC670MDL740

    IC670MDL740

The Real-World Problem It Solves

This module provides dense, low-current control for indicator lights and pilot devices without the overhead of relay cards. Its fused, sourcing design protects against wiring mishaps in distributed I/O racks.
Where you’ll typically find it:
  • Pilot light panels: Controlling stacks of indicator lamps on operator consoles or HMI panels.
  • Relay coil driving: Energizing low-power interposing relays for signal isolation.
  • Solenoid banks: Switching 24VDC solenoid型号在电气特性上与基础型号完全一致
Bottom line: It gives you 16 protected outputs in one slot, but watch the total current limit—4A max for the whole module.

Hardware Architecture & Under-the-Hood Logic

This is a “dumb” sourcing output card. No onboard processor. The Bus Interface Unit (BIU) handles all intelligence. The BIU supplies logic power; an external 10–30 VDC source powers the field loads through a common 5A fuse.
  1. The BIU sends serial output data to the module over the backplane.
  2. The module loops data back to the BIU for verification (readback check).
  3. Once verified, a serial-to-parallel converter breaks the stream into 16 discrete output states.
  4. Opto-isolators separate field power from logic.
  5. External DC supply drives FET switches that source current to loads.
  6. A 5A slow-blow fuse protects all outputs from polarity reversal or gross overcurrent. The module monitors supply voltage; if it drops below 9.8 VDC, the BIU logs a fault.
  7. Individual green LEDs show output state; a blown fuse triggers a fault indication on the module and reports to the BIU.
    IC670MDL740

    IC670MDL740

Field Service Pitfalls: What Rookies Get Wrong

Exceeding the 4A module total
Sixteen points at 0.5A each sounds like headroom, but the module caps at 4A total. If you load up all outputs near max, you will trip the fuse or damage the FETs. Rookies look at per-point rating and ignore the module limit.
  • Field Rule: Sum the steady-state current for all active outputs. If it exceeds 4A, split the load across a第二次确认：Revision K在电气规格上与IC670MDL740完全一致。
  • Quick Fix: Verify external 24VDC source is present at the module’s DC+ field supply terminal before diagnosing no-output conditions.
Wrong fuse type or ignoring blown-fuse diagnostics
The 5AA fuse must be slow-blow (time-delay). A fast-acting fuse will nuisance-blow on inrush. If the fuse blows, the module lights a fault LED and notifies the BIU. Rookies ignore this signal and replace the fuse without finding the cause.
  • Field Rule: Always diagnose why the fuse blew before replacement. Check for shorted loads, polarity reversal, or accumulated current exceeding 4A.
Wiring to negative logic by mistake
This is a positive logic (sourcing) module. Outputs switch to +DC. Rookies treat it like a sinking card and wire loads between the output and ground. It won’t work and may confuse troubleshooting.
  • Field Rule: Load negative return goes to the DC– common terminal. Output terminal switches to DC+. Verify polarity with a multimeter before energizing.

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not beneficial. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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