- The field supply establishes the positive or negative logic convention.
- Threshold and filtering networks condition each 125 VDC signal.
- Optical isolation transfers the group state to the BIU-side data buffer.
GE Fanuc IC670MDL642 125 VDC Positive/Negative Input Module
A sixteen-point 125 VDC input module for positive- or negative-logic field circuits.
Positive/negative DC input module16 in one group125 VDC0–150 VDC
Product identity
Model Profile
GE Fanuc IC670MDL642 is a sixteen-point 125 VDC discrete input module for Field Control. The module is used with high-voltage DC status circuits and accepts either positive-logic or negative-logic field wiring across its single input group.
Resistor, capacitor and zener networks establish the input thresholds before optical isolation transfers the states to module logic. The BIU reads the sixteen filtered states as two bytes of input data and supplies them to the host controller.
All points share the group’s polarity arrangement. IC670MDL642 is therefore selected by both voltage level and wiring convention, not simply by matching a sixteen-point count.
Model values
Product Data
- Product type
- Positive/negative DC input module
- Input points
- 16 in one group
- Rated voltage
- 125 VDC
- Input range
- 0–150 VDC
- Input current
- 2.5 mA per point at 125 VDC
- Field logic
- Positive or negative
- Isolation to logic
- 250 VAC continuous; 1500 VAC for 1 minute
- Input data
- 16 bits / 2 bytes
- Point indication
- One LED per input
- Logic power
- From Field Control BIU
Hardware function
High-Voltage Input Path
Selection detail
Circuit Matching
- Verify that the site circuit is 125 VDC and not a 48 VDC or 120 VAC control circuit.
- Keep all sixteen inputs on one polarity convention.
- Use the correct Field Control terminal assignment and preserve high-voltage segregation in the cabinet.
Buyer decisions
Technical Questions
Can IC670MDL642 replace a 120 VAC input module?
No. IC670MDL642 is a 125 VDC module; AC input models use different thresholds and circuitry.
Can positive and negative 125 VDC inputs share one IC670MDL642?
No. The entire sixteen-point group must use one logic convention.
What should be checked before energizing a replacement IC670MDL642?
Verify polarity, the 0–150 VDC operating range, common wiring and terminal-block assignments.
Why is the full IC670MDL642 model important when quoting?
It identifies the 125 VDC positive/negative input version rather than the 48 VDC or 5/12 VDC variants.
What station data should accompany an IC670MDL642 spare request?
Include the bus interface type, terminal-base style, module position and field-voltage polarity.
Does IC670MDL642 supply power to the field contacts?
No. An external 125 VDC source powers the input devices; the BIU supplies module logic power.
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