Description
At-A-Glance Executive Brief
- Model: IC200ALG321J-1800, base part IC200ALG321
- Brand: GE Fanuc
- Part Type: VersaMax analog voltage output I/O module
- Lifecycle status: OEM obsolescent, stocked for brownfield VersaMax control racks
- System compatibility: VersaMax CPU and I/O carrier bases
- Weight: 0.26 kg
Technical Introduction
When this analog output module fails, modulating valves, VFD setpoints and position actuators lose their control signal. This carrier-mounted 4-channel single-ended analog output converts 12-bit digital values from the VersaMax CPU into 0–10 VDC field signals. Each channel drives proportional control hardware, with outputs holding their last valid value if backplane communication drops. Front panel FLD PWR and OK LEDs give quick visual status for troubleshooting. The module draws backplane logic power and requires a separate external 18–30VDC field supply to drive the analog outputs. Process plants hold this spare to limit production downtime while reviewing legacy PLC migration.
- Best Suited For
- Analog valve positioning and variable frequency drive setpoint control
- VersaMax rack analog control loops for batch and continuous processes
- Direct drop-in replacement for existing IC200ALG321 series hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IC200ALG321J-1800 (base IC200ALG321) |
| Series | GE Fanuc VersaMax |
| Output Type | 0–10 VDC single-ended analog voltage |
| Channel Count | 4 channels |
| Resolution | 12-bit |
| Max Update Time | 0.3 ms |
| Full Scale Accuracy | 0.3% typical, 1% maximum |
| Field Supply | 18–30 VDC external DC supply |
| Backplane Draw | 125 mA @ 5VDC |
| Indicators | FLD PWR LED, Module OK LED |
| Weight | 0.26 kg |
| Environmental Details | Please refer to the OEM datasheet for complete environmental tolerances. |
Field Engineer’s Tech Notes
- Output load resistance must stay within the module’s rated range. Too low load resistance pulls down voltage levels and causes erratic control loop behaviour even with correct PLC I/O mapping.
- The external field power supply is separate from backplane power. A dead field supply will leave the module OK LED lit while all analog outputs stop responding, which can mislead troubleshooting.
Adaptive QA & Testing Protocol
Each module installs on a VersaMax carrier inside our bench test rack. We set the PLC to output stepped digital values across the full 0–10VDC span for all four channels, measuring voltage output with precision multimeter. We verify FLD PWR and OK LED behaviour under normal field power and field power loss conditions. We confirm hold-last-state function during simulated backplane communication interrupt. Full test reports or bench test video clips are available upon request.
Buyer’s FAQ
Q: What does J-1800 suffix mean for IC200ALG321J-1800? A: The suffix identifies hardware revision and manufacturing batch variant. Pinout and core 0–10VDC function match base IC200ALG321, but match the full marking against your installed unit before swap.
Q: What warranty applies for refurbished and NSFP IC200ALG321J-1800? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes damage from overvoltage, reversed field power or shorted analog output wiring.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory is depleted, lead time increases while we source available surplus analog I/O modules.
Q: Can this module output 4-20mA current signals? A: No. This is a voltage-only 0–10VDC module. Use IC200ALG320 for 4–20mA analog current outputs.
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