- The module supplies the excitation current required by each configured RTD type.
- Three-wire and four-wire connections use separate source, sense and return terminals.
- Each channel converts the resistance measurement into configured engineering data.
GE Fanuc · FIELD CONTROL TEMPERATURE INPUT
GE Fanuc IC670ALG621 Field Control RTD Analog Input Module
A four-channel RTD input module for 3-wire and 4-wire resistance-temperature sensors.
4 RTD INPUTS3 / 4 WIRETEMPERATURE DATA
Product Overview
GE Fanuc IC670ALG621 is a four-channel RTD analog input module for Field Control stations. It excites connected resistance-temperature detectors, measures the returned resistance and converts each channel into temperature or resistance data for the bus interface unit.
The module supports both 3-wire and 4-wire RTD circuits, allowing lead-resistance compensation to be matched to the installed sensor wiring. Individual channels can be configured for different supported RTD characteristics rather than forcing one sensor type across the module.
Open-sensor, shorted-input, underrange, overrange and high/low alarm conditions are available as channel diagnostics. This makes IC670ALG621 a temperature-acquisition module rather than a general current or voltage input device.
Technical Specifications
| Product type | RTD analog input module |
|---|---|
| Product family | Field Control |
| Input channels | 4 |
| Sensor wiring | 3-wire and 4-wire RTDs |
| Digital resolution | 15 bits plus sign |
| Scan time at 60 Hz | Approximately 210 ms per point |
| Scan time at 50 Hz | Approximately 230 ms per point |
| Diagnostics | Open RTD, short, underrange, overrange, high/low alarm |
| Operating temperature | 0–55 °C |
| BIU current draw | 190 mA maximum |
RTD Channel Processing
Sensor and Wiring Review
- Confirm RTD material, nominal resistance and lead arrangement before configuration.
- Use the terminal assignment that matches 3-wire or 4-wire installation.
- Do not substitute a thermocouple module for RTD sensors; the measurement principle and termination differ.
Buyer Questions
How can a buyer confirm IC670ALG621 suits existing RTD field wiring?
Identify each sensor type and confirm whether the installed cable uses three or four conductors per RTD.
Why can IC670ALG621 report an open-wire fault after replacement?
Check the source, input and return terminals against the selected 3-wire or 4-wire diagram and verify continuity to the sensor.
Can different RTD types be connected to one IC670ALG621?
Yes. The four channels can be configured individually for supported RTD types.
What should be compared before replacing IC670ALG620 with IC670ALG621?
Review module revision, available diagnostics, configuration support and the BIU firmware used by the station.
Which data should be included in an IC670ALG621 enquiry?
Provide the complete model, RTD types, wire arrangement, channel count in use and required module revision.
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