IC694ALG392 Analog Output Module for Precision Control

IC694ALG392: Precision Analog Output on PACSystem RX3i

The IC694ALG392 is an analog output module for the PACSystem RX3i platform, and its role is the inverse of an analog input module: where an input converts a 4-20 mA measurement into a process value, an analog output converts a controller value back into a driveable analog signal.

In practice that means it is the module that holds a control output steady when the process is otherwise steady — a control valve position, a variable speed drive reference, a heater or mixer output. On a process with slow dynamics, the module has to hold its output without drift, because drift in the output path appears directly as process drift.

The GE Fanuc IC694ALG392 is an 8-channel analog output module for PACSystem RX3i. It provides voltage (0-10V, -10-10V) and current (0-20mA, 4-20mA) outputs with 15/16-bit resolution. Features 8ms update rate, open wire fault detection, and compatibility with Series 90-30/90-70 PLCs.

Feature	Specification
Manufacturer	GE Fanuc / GE Intelligent Platforms
Brand	GE
Part Number	IC694ALG392
Number of Output Channels	1 to 8 selectable, single-ended outputs Output Current Range: 4 to 20 mA and 0 to 20 mA Output Voltage Range: 0 to 10V and -10 V to +10V Update Rate: 8 Milliseconds Calibration: Factory calibrated to .625 µA for 0 to 20 mA
and .3125 mV for voltage (per count) Resolution	4 to 20mA: 0.5 µA (1 LSB = 0.5 µA)
0 to 20mA	0.625 µA (1 LSB = 0.625 µA)
0 to 10V	0.3125 mV (1 LSB = 0.3125 mV)
-10 to +10V	0.3125 mV (1 LSB = 0.3125 mV) Absolute Accuracy, Voltage mode: +/-0.25% of full scale @ 25°C (77°F), typical
+/-1.0% of full scale over operating temperature range (maximum) Power Consumption	110 mA from +5 VDC PLC backplane supply
315 mA from +24 VDC user supply External Supply Voltage Range	20 VDC to 30 VDC External Power Supply Voltage Ripple: 10% (maximum) Compatible Actuators: Valves, motors, pistons, and agitators

RX3i Analog and Related I/O Modules

RX3i analog modules differ in signal direction, signal type and channel count. All three have to match the field devices and the control loop the module is being fitted into:

PACSystem Part Number	Analog Module Function
IC694ALG223	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG106	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG112	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG306	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG312	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG412	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG508	PACSystem RX3i analog module — confirm signal direction and type against the loop
IC695ALG600	PACSystem RX3i analog module — confirm signal direction and type against the loop

PACSystem Part Number	Module Function
IC694ALG223	PACSystem RX3i I/O module — confirm signal type and direction against the field devices
IC694MDL660	PACSystem RX3i I/O module — confirm signal type and direction against the field devices
IC694MDL930	PACSystem RX3i I/O module — confirm signal type and direction against the field devices
IC694MDL940	PACSystem RX3i I/O module — confirm signal type and direction against the field devices

All GE parts · I/O Modules · PLC & I/O Modules

Output Resolution and Process Resolution

Analog output resolution determines the smallest change the module can produce. On a control loop with a narrow deadband, a coarse output step can be larger than the loop can act on — the controller keeps writing new values, the output does not move, and the loop hunts or oscillates for reasons that look like a tuning problem.

Check the module resolution against the resolution the loop needs before ordering, not after commissioning.

Loop Calibration After Replacement

After replacing an analog output module, verify the loop end to end rather than trusting the module report. The useful check is a manual command at a few points across the output range, measuring the actual signal at the field device. That confirms the output, the wiring and the field device together, and separates a module problem from a field-side one in a single pass.

Output Isolation and Shared-Return Risk

Where multiple analog outputs share a return path, a fault on one output circuit can appear across the others. Confirm the isolation arrangement of the module being fitted against the field wiring, and avoid sharing returns between outputs that drive independent control loops.

Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: US. Listed by AutoDCS Tech Parts Team · Last updated 2026-10-07.