GE Fanuc IC670ALG620 Field Control I/O
Configured for Resistance Temperature Detector (RTD) acquisition in Field Control I/O systems, the GE Fanuc IC670ALG620 (IC670ALG620 Analog Input Module) provides direct physical/electrical execution. This hardware component interfaces four independent RTD sensors to a central controller, eliminating external signal transmitters. The unit supports 3-wire and 4-wire configurations and executes automatic lead resistance compensation across all channels. Operating with a 15-bit plus sign resolution, the device transmits diagnostic data to the Bus Interface Unit (BIU) during open sensor, short circuit, and out-of-range anomalies.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC670ALG620 |
| Brand | GE Fanuc |
| Origin | USA |
| Weight | 0.45 kg |
| Dimensions | Standard Field Control footprint |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 190 mA maximum from BIU |
| Number of Channels | 4 independent channels |
| Supported RTD Types | Platinum, Nickel, Copper |
| Digital Resolution | 15 bits plus sign |
| Conversion Time | 210 ms at 60 Hz / 230 ms at 50 Hz |
| Isolation | 1500 VAC (1 minute), 250 VAC (Continuous) |
| Normal Mode Rejection | 60 dB at 50/60 Hz |
| Common Mode Rejection | 120 dB at 50/60 Hz |
| Maximum Lead Resistance | 5 ohms per lead |
Industrial Control Backplane and Network Integration
The hardware utilizes high-velocity backplane bus communication to transfer process variables and diagnostic bits to the head-end Bus Interface Unit. The determinism of the industrial network relies on the fixed conversion timings of the internal analog-to-digital matrix, executing at 210 ms on 60 Hz networks and 230 ms on 50 Hz networks. Scaling of the multi-channel I/O density occurs directly via the modular backplane structure. Digital filtering routines achieve a common mode rejection factor of 120 dB, suppressing industrial electromagnetic interference and preventing firmware execution calculation errors.
Frequently Asked Questions
Q: What is the maximum distance or line resistance allowed for the sensor connections?
A: The hardware supports a maximum lead resistance of 5 ohms per wire. Exceeding this limit degrades the accuracy of the internal compensation circuit.
Q: How does the module handle a completely severed sensor wire?
A: The hardware triggers an open circuit diagnostic bit. The module immediately updates the status register and transmits a fault signal to the Bus Interface Unit.
Q: Can 3-wire and 4-wire RTD sensors be mixed on the same module?
A: Yes, the four input channels operate independently. Terminal block wiring configurations determine the compensation loop structure for each channel.
Field Installation Guidelines
- Mount the module vertically on the standard Field Control I/O chassis to ensure optimal natural convection cooling.
- Terminate all sensor shields at the designated chassis ground bar. Maintain a single-point grounding topology to eliminate ground loops.
- Route low-voltage analog RTD wiring through dedicated conduits separate from high-voltage AC power distribution lines.
- Verify that the terminal block screws are torqued to factory specifications before powering the backplane bus.
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