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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | IC693ALG442 |
| Product Family | GE Fanuc Series 90-30 |
| Product Type | Analog current/voltage combination I/O module |
| Analog Inputs | 4 differential channels |
| Analog Outputs | 2 single-ended channels |
| Input Voltage Ranges | 0–10 VDC and −10 to +10 VDC |
| Input Current Ranges | 0–20 mA and 4–20 mA |
| Output Voltage Ranges | 0–10 VDC and −10 to +10 VDC |
| Output Current Ranges | 0–20 mA and 4–20 mA |
| Input Resolution | 12-bit nominal; verify revision-specific data |
| Output Resolution | 12-bit nominal; verify revision-specific data |
| Input Format | 16-bit analog data in %AI registers |
| Output Format | 16-bit analog data in %AQ registers |
| Update Rate | Approximately 4 ms for the module |
| External Supply | User-supplied 24 VDC |
| External Supply Current | Approximately 129 mA for earlier IC693 versions; verify the module revision |
| Input Type | Differential |
| Output Type | Single-ended |
| Isolation | Field-to-backplane isolation; verify the applicable IC693ALG442 manual for test and continuous ratings |
| Configuration | Logicmaster 90-30/20/Micro, Hand-Held Programmer, or compatible configuration software |
| Module Family Position | Series 90-30 mixed analog module; do not assume identical specifications with IC694ALG442 |
The GE Fanuc IC693ALG442 is a Series 90-30 mixed analog module with four differential inputs and two single-ended outputs. Each channel can be configured for voltage or current operation, including 0–10 V, ±10 V, 0–20 mA, and 4–20 mA ranges.
This module is useful where a single rack slot must handle both analog measurement and actuator control. It requires a user-supplied 24 VDC source, and its terminal wiring changes with the selected signal type, so verify jumpers, commons, scaling, and the exact IC693 hardware revision before installation.
IC693ALG442
IC693ALG442
IC693ALG442
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module is not detected by the PLC | Backplane connection, rack power, slot configuration, or failed module | ✅ High | Check Series 90-30 rack status, module seating, and hardware configuration | Verify the rack and slot setup before replacing the IC693ALG442 |
| All input channels read zero | Missing 24 VDC supply, incorrect common wiring, or wrong input mode | ✅ High | Measure the user supply and apply a known signal directly across one differential input pair | Check supply, terminal wiring, and channel configuration |
| One input reads full scale | Open circuit, wrong jumper arrangement, excessive signal, or failed input channel | ✅ High | Measure the signal at the input terminals and compare it with the PLC %AI value | Test with a calibrated source and confirm the selected voltage/current range |
| Input values are unstable | Shielding problem, ground loop, transmitter fault, or loose terminal | ❌ Low | Compare the source signal at the transmitter and module terminals; inspect shield termination | Correct field wiring and grounding before replacing the module |
| Current input is incorrect | Wrong shunt or jumper configuration, incorrect signal range, or loop wiring error | ✅ High | Measure loop current with a calibrated meter and verify the input wiring against the manual | Confirm 0–20 mA versus 4–20 mA configuration before changing hardware |
| All outputs remain at zero | Missing external 24 VDC, disabled outputs, or incorrect %AQ data | ✅ High | Measure the 24 VDC supply and monitor the raw %AQ registers while issuing a test command | Check supply and PLC command data first |
| One output is stuck at a limit | Incorrect scaling, failed output channel, or output load problem | ✅ High | Command zero, midscale, and full scale; measure the output at the terminal each time | Replace the module only if known-good commands produce no corresponding output |
| Current output drops under load | Excessive load resistance, open loop, or insufficient supply voltage | ✅ High | Measure loop voltage and current with the actuator connected and disconnected | Check load, loop supply, and wiring before replacing the output channel |
| Voltage output is wrong but current output works | Channel-specific configuration or output circuit fault | ✅ Medium | Test the same channel in the alternate supported mode only if the wiring and configuration permit it | Verify configuration and terminal assignment; do not change modes while energized |
| PLC values are scaled incorrectly | Wrong range selected or incorrect %AI/%AQ engineering-unit scaling | ❌ Low | Apply a known 0%, 50%, and 100% signal and compare raw register values | Correct the PLC scaling and configuration before replacing the module |
| Several channels fail together | Shared 24 VDC supply, common terminal, or rack fault | ❌ Low | Measure supply voltage under load and inspect the common terminals | Investigate common power and wiring before condemning the module |
| New replacement behaves differently | IC693 versus IC694 revision difference, wiring mismatch, or configuration mismatch | ✅ High | Compare catalog number, suffix, revision label, terminal layout, and configuration files | Do not substitute an IC694ALG442 without confirming system compatibility |
If the fault remains unclear, contact technical support with photos of the module label, terminal wiring, jumper positions, 24 VDC measurements, raw %AI/%AQ values, PLC fault table, and selected channel ranges.
Frequently Asked Questions (FAQ)
What is the IC693ALG442 used for?
It combines four analog input channels and two analog output channels in one Series 90-30 module. The inputs and outputs can use voltage or current signal ranges, making it suitable for transmitters, control valves, drives, and analog process instruments.
Are the inputs differential?
Yes. The IC693ALG442 uses four differential analog inputs. Keep each signal pair wired according to the terminal diagram, and do not assume the input commons are interchangeable with the output common.
What signal ranges can I configure?
The module supports 0–10 VDC, −10 to +10 VDC, 0–20 mA, and 4–20 mA configurations. The exact terminal connections and jumper settings depend on the selected mode.
Does the module need an external 24 VDC supply?
Yes. The requires a user-supplied 24 VDC source for its analog circuitry and field loops. Check the supply voltage under load and provide adequate current capacity before troubleshooting individual channels.
Can I replace an with an IC694ALG442?
Do not treat them as automatic substitutes. Although the catalog numbers are similar, hardware generation, power requirements, configuration software, terminal wiring, and supported system platforms may differ. Confirm the compatibility matrix and the exact module revision before ordering.
Can I hot-swap the ?
Do not hot-swap it unless the site documentation explicitly permits the procedure. Remove rack power, isolate the analog field circuits, document the existing configuration, and observe ESD precautions before replacement.
Why is this module cheaper than a factory replacement?
The is a legacy Series 90-30 component commonly sourced through surplus, used, or refurbished inventory. Confirm the exact condition, test procedure, warranty, date code, terminal hardware, and return policy before purchase.
