- Each 120 VAC field circuit passes through its own input network and optoisolator.
- Filtered states are loaded into an eight-bit data buffer.
- The BIU reads that byte and supplies it to the host controller.
GE Fanuc · FIELD CONTROL DISCRETE INPUT
GE Fanuc IC670MDL233 120 VAC Isolated Input Module
An eight-point 120 VAC input module with point-to-point isolation for Field Control stations.
8 ISOLATED120 VACINPUT POINTS
Product Overview
GE Fanuc IC670MDL233 is an eight-point 120 VAC discrete input module for Field Control. Each field input is isolated from the other points, allowing separate AC input circuits to be monitored without placing all eight signals in one common group.
The module uses optical isolation and input filtering to convert 120 VAC field states into one byte of discrete input data. Point LEDs display the buffered state of each input, while the PWR indicator confirms that backplane logic power is present.
An external 120 VAC source powers the field devices; operating power for module electronics comes from the bus interface unit. Input thresholds and response times are defined for industrial 47–63 Hz control circuits.
Technical Specifications
| Product type | Isolated discrete input module |
|---|---|
| Input points | 8 isolated |
| Rated voltage | 120 VAC |
| Input range | 0–132 VAC, 47–63 Hz |
| Typical input current | 13 mA per point at rated voltage |
| On-state voltage | 70–120 VAC |
| Off-state voltage | 0–20 VAC |
| On response | 10 ms typical; 20 ms maximum |
| Off response | 20 ms typical; 40 ms maximum |
| Point isolation | 300 VAC continuous |
| BIU current draw | 40 mA maximum |
Isolated Input Path
Terminal Planning
- Select box, barrier or connector-style Field Control bases to suit the cabinet wiring method.
- Keep the neutral assignment paired with each isolated point.
- Use the module’s keying positions to prevent installation of an incompatible I/O type.
Buyer Questions
When is IC670MDL233 preferable to IC670MDL240?
Choose IC670MDL233 when eight 120 VAC inputs require point-to-point isolation; IC670MDL240 has sixteen grouped inputs.
Why does an IC670MDL233 input LED remain off at 50 VAC?
The specified on-state range begins at 70 VAC, so 50 VAC is not a guaranteed ON level.
Can the eight IC670MDL233 inputs use separate neutrals?
Yes. The isolated-point design provides individual field-circuit separation.
What should be checked if IC670MDL233 has PWR on but reports no input states?
Verify the external 120 VAC field supply, neutral wiring, terminal assignment and the BIU configuration.
Which wiring data should accompany an IC670MDL233 order?
State the terminal-block style, number of isolated circuits, field frequency and required revision.
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