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The GE Fanuc IC694ALG221, also cataloged as the IC694ALG221 Analog Input Module, operates as a dedicated hardware component for analog current signal acquisition within PACSystem RX3i platforms.

Hardware Specifications

Parameter Specification
Model IC694ALG221
Brand GE Fanuc / Emerson
Origin USA
Weight 0.40 kg (0.88 lbs)
Dimensions Standard RX3i single-slot module
Operating Temp 0 to 60 deg C
Power Consumption 25 mA at 5 VDC (backplane), 100 mA at 24 VDC (isolated)
Number of Channels Four (4) analog current input channels
Analog Signal Ranges 0 to 20 mA, 4 to 20 mA
Resolution 12 bit (5 uA/bit at 0-20 mA, 4 uA/bit at 4-20 mA)
Channel Update Rate 2 ms across all four channels
Input Impedance 250 ohms
Accuracy 0.1% full scale (Absolute: 0.1% full scale + 0.1% reading)
Input Filter Response 325 Hz
Common Mode Voltage 200 V
Hot-Swapping Capability Not Supported
Connector Type 20-screw terminal block
Status Indicator 1 Green "Module OK" LED

Backplane Bus Communication Velocity & I/O Density Scaling

The IC694ALG221 interfaced directly to the PACSystem RX3i universal backplane transfers digitized loop data into CPU memory registers across each 2 ms scan interval. Designed to support four high-density current loops, the unit uses internal 12-bit analog-to-digital converters to translate 0-20 mA and 4-20 mA field signals with 250-ohm input termination. Onboard firmware flash compatibility ensures synchronized parameter configuration and factory-calibrated scaling offsets across all RX3i backplane rack slots without drift over operating temperature gradients.

Frequently Asked Questions

Q: Does the IC694ALG221 analog input module support hot-swapping during backplane operation?

A: No, hot-swapping is not supported. Power to the baseplate rack and field terminal connections must be isolated before insertion or removal of the module.

Q: What are the backplane internal power consumption requirements for this module?

A: The module draws 25 mA from the +5 VDC backplane logic supply and 100 mA from the isolated +24 VDC external power bus.

Q: What is the input conversion rate and response time for processing all analog channels?

A: The module features a 2 ms update time to evaluate and update digital values for all four input channels concurrently.

Field Installation Guidelines

  1. Disconnect backplane main power and field circuit wiring before seating the module into the baseplate slot.
  2. Align the module card edges with the RX3i backplane guide rails and press firmly until top and bottom latches secure the chassis.
  3. Wire 0-20 mA or 4-20 mA process loops to the removable 20-screw terminal block using shielded twisted-pair cabling.
  4. Connect the signal cable drain shield strictly to a single panel chassis ground point to prevent ground loop currents across the 200 V common mode voltage barrier.

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