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IC694ALG221 Wiring

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  • IC694ALG221
  • IC694ALG221 Wiring

Product Description

The IC694ALG221 is an Analog Current Input Module manufactured by GE Fanuc for the RX3i PacS
ystem. The module has two input ranges, 4 to 20mA (default) or 0 to 20 mA. The module is equipped with two range jumpers, one for the first and second channels and the other for the third and fourth channels. When a range jumper is connected to the I/O terminal panel, the input range deviates to 0-20mA.

All four channels possess a conversion speed of one-half of a millisecond. The channels’ conversion speed allows a 2-millisecond update rate. This occurs because there are two channels on each jumper with a conversion speed of one-half millisecond per channel.

Input protection for IC694ALG221 will suffice for operation with reduced performance with up to 200 V common-mode. The module provides electrical isolation of external noise between the field wiring and backplane by utilizing optical isolation.

IC694ALG221 can be installed in any I/O slot of an RX3i system. Location of the module helps identify the power source. If the module’s location is in the universal backplane, an external source of remote power accompanied by the 24VDC is needed to provide power. If it is in the expansion or remote backplane, remote power is distributed by the backplane itself. The module’s power supply is functioning when the Module’s LED OK is ON.

To help in the reduction of noise and capacitive issues, ground connections to the IC694AGL221 module need to be wired with a high grade of twisted, protected instrumentation cable. Shields can be connected to either the COM or GND. 

Technical Specifications

No. of channels: 4 Inputs
Current Range: 4 - 20 mA, 0 - 20 mA 
Calibration: Factory (to 4 μA per count)
Update Rate: 2 msec
Input Filter Response:   325 Hz
Power Consumption: 25 mA @ +5VDC, 100 mA @ +24VDC Isolated



GE Intelligent Platforms / GE Fanuc GE RX3i PacSystem

SKU 2174315  UPC 0799705802445

Part Number: IC694ALG221 / ic694alg221
Mfr/Brand Name: GE Automation
Mfr Number: IC694ALG221 / ic694alg221
Type: Analog Input Module, 4 Channel Differential Current

Troubleshooting and Product Information for IC694ALG221

Download product information, troubleshooting guides and operation manuals to get your PLC operational.

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Other IC694ALG221

Available Revisions:

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1C694ALG221 , GEFIC694ALG221 , CIMIC694ALG221


Input  Current Ranges

4 to 20 mA and 0 to 20 mA


Factory calibrated to 4 µA per count

Update Rate

2 milliseconds (all four  channels)

Resolution at 420 mA

4 µA (1 LSB = 4 µA)

Resolution at 020 mA

5 µA (1 LSB = 5 µA)

Absolute Accuracy43

0.1% full scale + 0.1% reading

Common  Mode Voltage

200 volts


< 1 Least Significant Bit

Isolation, Field to Backplane (optical) and to frame  ground

250 V ac continuous; 1500 V ac for 1 minute

Common Mode Rejection

> 70dB at DC; >70dB at 60Hz

CrossChannel  Rejection

> 80dB from DC to 1kHz

Input  Impedance


Input Filter Response

325 Hz

Internal  Power Consumption

100 mA from the isolated +24Vdc supply 25 mA from +5Vdc bus on the backplane


Troubleshooting IC694ALG221

Troubleshooting information is available on IC694ALG221's website page; it also includes a datasheet user-manual and a wiring diagram.


Repair your IC694ALG221

PDF Supply can repair your IC694ALG221 in 3-5 business days. And PDF Supply stands by all of its repairs with a 1 year customer satisfaction warranty.

Customer Questions and Answers

  • Question:  What is an IC694ALG221?  Answer:  The IC694ALG221 is a 4-Channel, Differential, Analog Input module from the GE Fanuc RX3i Series. 
  • Question:  What range of inputs does IC694ALG221 provide?   Answer:  IC694ALG221 has 2 possible input ranges. The first is 4 to 20 mA and the second is 0 to 20 mA. 
  • Question: For what are the 2 range jumpers provided?  Answer:  One is for channels 1 and 2 and the second is for channels 3 and 4. 
  • Question:  What is the conversion speed for each of the 4 channels?  Answer:  The conversion speed is one-half millisecond. 
  • Question:  What does this provide?  Answer:  This provides an update rate of 2 milliseconds for any channel.
  • Question:  What is the resolution of the converted signals over either range?  Answer:  12 bits binary (1 part in 4096)
  • Question:  What should I do if my IC694ALG221 is not working properly?  Answer:  Your IC694ALG221 may need repair

For more information on the IC694ALG221 4-Channel, Differential, Analog Input Module of the GE Fanuc RX3i Series, please see the Datasheet User-Manual.

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