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RX3i ALG508 Analog

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SKU 2178069  UPC 0841134997206


Repair Service


5-10 Days

✓  2 Year PDF Supply Warranty

*What is Fast Repair?

Other Available Revisions for the IC695ALG508 IC695ALG508-AAIC695ALG508-BAIC695ALG508-CAIC695ALG508-DBIC695ALG508-LT

Common misspellings:
  • 1C695ALG508
  • IC695A1G508
  • IC695ALG5o8
  • IC695ALG50b
  • IC695ALG508

Technical Specifications for IC695ALG508

ManufacturerGE Fanuc
SeriesRX3i PACSystems
Part NumberIC695ALG508
Product TypeRTD Input Module
Number of Required Backplane Slots1
Number of Inputs8
Channel to Channel IsolationSupported
Input ImpedanceN/A
Additional I/O ModulesNot Required

Product Description

The IC695ALG508 is an 8-Channel, Isolated, Resistance Temperature Detector (RTD) Input module from the GE Fanuc RX3i Series. The IC695ALG508 provides 8 isolated differential RTD input channels.  The module must be located in an RX3i Universal Backplane.  It requires an RX3i CPU firmware version 5.5 or later. See specifications for this unit on IC695ALG508's website page.

Technical Specifications

Module Type: RTD Input Module 
No of Inputs: 8 Differential Inputs 
Internal Power: 3.3V: 400mA;  5.1V: 200 mA
Number of Slots:  1 (single slot)
Range (ohms): 250/500/1000/2000/3000/4000 
Power Dissapation:  2.5W max



The IC695ALG508 input module is an isolated RTD input module that has been designed by GE Fanuc Automation. This module has been exclusively designed to operate with the RX3i PACSystems mid-range controllers. The RTD input module's main objective is to enable the direct connection of 2-wire and 3-wire RTD temperature sensors without the need for using external signal-processing devices such as transducers and transmitters. All the processing of the RTD signals is performed by using this module. The GE Fanuc Automation IC695ALG508 isolated RTD input module comes with 8 isolated RTD input channels. Each one of these channels can be individually configured for different RTD or resistance applications.

The lifecycle status of the GE Fanuc Automation IC695ALG508 isolated RTD input module is active and the module type is also resistive, providing channel to channel isolation. The module uses a universal backplane and a PCI bus as backplane support, and it occupies one slot of the rack. The GE Fanuc Automation IC695ALG508 isolated RTD input module can perform full diagnostics for errors such as open wire and short circuit errors, and it has a positive and negative rate of change and high and low alarms. The channel to channel isolation rating is 250 Volts AC continuous and 1500 Volts AC for 1 minute. The module does not include a notch filter and it has a calibrated accuracy of 0,5% at a temperature of 25 degrees Celsius. The resolution of the module is 32 bits standard with a floating-point data format or 16 bits with an integer input data format. The module does not provide input impedance and it does not require the use of another I/O module.

Technical Information


Number of Channels


Measuring method selectable per channel

RTD/resistance: up to 4k ohms

RTD input types

â–ª          50, 100, 200, 500, and 1000 ohm Platinum 385 (IEC751 1983, Amend 2

1995; JISC 1604 1997)

â–ª          50, 100, 200, 500, and 1000 ohm Platinum 391.6  (JISC 1604: 1981)

â–ª          100 ohm, 200 ohm, 500 ohm, and 1000 ohm Nickel 618 (DIN 43760

Sept. 1987)

â–ª          120 ohm Nickel 672 (MINCO Application Aid #18, 5/90 Type Ni)

â–ª          10, 50, and 100 ohm Copper 426 (SAMA RC21-4-1966)

â–ª          604 ohm Nickel-Iron 518

Resistance Input Types

0-260, 0-525, 0-1050, 0-2100, 0-3150, 0-4200 ohms

Maximum RTD Lead Resistance

25 ohms each side, for a total of 50 ohms.

RTD and Resistance Input Types

Input Type

Ohms Supported

Excitation Current


0-260, 0-525

0.717 mA

0-1050, 0-2100, 0-3150,


0.238 mA

Platinum 385


1.175 mA


0.717 mA

200, 500, 1000

0.238 mA

Platinum 391.6


1.175 mA

100, 200

0.717 mA

500, 1000


Nickel 672


0.717 mA

Nickel 618


0.717 mA


0.238 mA

Nickel-Iron 518


0.238 mA

Copper 426


1.654 mA

50, 100

1.175 mA

RTD Ranges

RTD Type

Low temp (ï‚°C)

High temp (ï‚°C)

Copper 426



Nickel 618



Nickel 672



Nickel-Iron 518



Platinum 385



Platinum 391.6



Temperature accuracy for inputs from 4-wire RTDs over temperature span (2.3, 4, and 4.7 Hz filters). This data does do not include the RTD sensor accuracy, which must be included when determining the overall system performance.


Three-wire RTDs have similar accuracies, but depend on the lead resistances being balanced.


For 2-wire RTDs, the lead resistance of the RTD contributes to the temperature error.

All tolerances double when 24Hz or 28Hz filters are used.

RTD Type


0°C to +60°C

50 Ω Platinum 385

+/- 1.0°C

+/- 1.7°C

100 Ω Platinum 385

+/- 0.7°C

+/- 1.2°C

200 Ω Platinum 385

+/- 0.6°C

+/- 1.0°C

500 Ω Platinum 385

+/- 0.5°C

+/- 0.9°C

1000 Ω Platinum 385

+/- 0.5°C

+/- 0.9°C

100 Ω Platinum 391.6

+/- 0.6°C

+/- 1.1°C

200 Ω Platinum 391.6

+/- 0.5°C

+/- 0.9°C

500 Ω Platinum 391.6

+/- 0.4°C

+/- 0.8°C

1000 Ω Platinum 391.6

+/- 0.4°C

+/- 0.8°C

Nickel 672

+/- 0.3°C

+/- 0.5°C

Nickel 618:

+/- 0.3°C

+/- 0.5°C

Nickel-Iron 518

+/- 0.4°C

+/- 0.7°C

10 Ω Copper 426

+/- 1.0°C

+/- 2.4°C

50 Ω Copper 426

+/- 0.8°C

+/- 1.9°C

100 Ω Copper 426

+/- 0.8°C

+/- 1.9°C


Temperature accuracy for Resistance inputs



0°C to +60°C

250 ohms

+/- 0.25 Ω

+/- 0.35 Ω

500 ohms

+/- 0.3 Ω

+/- 0.45 Ω

1000 ohms

+/- 0.5 Ω

+/- 0.8 Ω

2000 ohms

+/- 0.9 Ω

+/- 1.5 Ω

3000 ohms

+/- 1.3 Ω

+/- 2.2 Ω

4000 ohms

+/- 1.7 Ω

+/- 2.9 Ω

Measurement Units

Degrees C or F, or Ohms


0.05% of span at a constant temperature over a 30-second period (0.1% for 10-ohm copper, 28Hz filter)

Diagnostics reported to the controller

User configurable for Over Range, Under Range, High and Low Alarm, High- high and Low-low alarm, Open Circuit Detection, Positive and Negative Rate of change alarm

Service Requests

Report module firmware revision


Supports removal and replacement under power as described in the RX3i System Manual (GFK-2314).


Module should be field calibrated via the configuration software.

Channel-to-channel crosstalk

70 dB minimum at 120mS update rate for all channels

Common Mode Rejection

2.3 Hz filter, 50/60Hz: 100 dB for 4-wire, 90 dB for 2 and 3 wire 4 Hz filter, 50/60Hz: 100 dB

4.7 Hz filter, 50/60Hz: 100 dB

24 Hz, 28 Hz filter 50/60 Hz: 80 dB

Default or Hold Last State

For each of fault and disabled modes, the configuration will specify either to default a channel input to 0 or hold the last state of the input

Fault Reporting

The configuration can enable or disable fault reporting for either of under or over range alarm, open circuit, and rate of change alarm.

Rate of change

For each channel, the configuration can enable/disable and specify positive and negative rate of change alarms.

Channel Value Format

16-bit integer (in a 32-bit field) or 32-bit real number data for each channel.

Current Consumption

3.3V: 400mA; 5V: 200mA

Excitation Current

0.238mA-1.654 mA, depending on the input range.

Power Dissipation

2.5W max

Isolation Voltage

(Field to Backplane and Channel to Channel)

250VAC Continuous 1500VAC 1 minute

2550VDC 1 second

Normal Mode Noise Rejection

2.3 Hz filter, 50Hz: 67dB

2.3 Hz filter, 60Hz: 67dB

4 Hz filter, 50Hz: 80dB

4.7 Hz filter, 60Hz: 80dB

24 Hz filter, 50Hz: 25dB

28 Hz filter, 60Hz: 25dB

Filter Settings, Update Times, Rejection, and Resolution

Filter Frequency (-3dB frequency)

Update Time (milliseconds)

Normal Mode Rejection at  50/60 Hz

2.3 Hz

120 (130 max)

67dB @ 50/60 Hz

4 Hz

70 (80 max)

80dB @ 50 Hz

4.7 Hz

60 (70 max)

80dB @ 60 Hz

24 Hz

20 (30 max)

25dB @ 50 Hz

28 Hz

15 (25 max)

25dB @ 60 Hz



Troubleshooting IC695ALG508

Troubleshooting information is available on IC695ALG508's website page; it also includes a datasheet user-manual and a wiring diagram.


Repair your IC695ALG508

PDF Supply can repair your IC695ALG508 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 IC695ALG508?  Answer:  The IC695ALG508 is an 8-Channel, Isolated, Resistance Temperature Detector Input module from the GE Fanuc RX3i Series.
  • Question:  What does IC695ALG508 do?   Answer:  This module provides 8, isolated differential RTD input channels. 
  • Question:  The configuration for each channel can be what?   Answer:
    • RTD Inputs:
      • 50, 100, 200, 500, and 1000 ohm Pt 385
      • 50, 100, 200, 500, and 1000 ohm Pt 391.6
      • 100, 200, 500, and 1000 ohm Ni 618
      • 120 ohm Ni 672
      • 604 ohm NiFe 518
      • 10, 50, and 100 ohm Cu 426
    • Resistance Inputs:
      • 250, 500, 1000, 2000, 3000, and 4000 Ohms
  • Question:  What is one thing you will need to test IC695ALG508?   Answer:  You will need a high-density terminal strip (IC694TBB032). 
  • Question:  What do I need to know about the high-density terminal strip?   Answer:  You should make sure the lever on it is in the upright-most position, which will turn the LED green to let you know you are fully connected. If it is red or you don't have a light, then you know something is wrong. 
  • Question:  What am I expecting to see when I probe each channel with the resistor?   Answer:  You should expect to see the same number because you should have set them all up with the same configuration. 
  • Question:  Why is this important?   Answer:  It is important because if there is an issue with a channel not reading the same number, then you will know and be able to check into that channel. 
  • Question: What should I do if my IC695ALG508 is not working properly?   Answer:  Your IC695ALG508 may need repair

For more information on the IC695ALG508 8-Channel, Isolated, Resistance Temperature Detector Input Module of the GE Fanuc RX3i Series, please see the Datasheet User-Manual.

Release History



Firmware Revision




New HW and FW design to address obsolescence issue and meet RoHS compliance.



Label change only. No change in functionality, performance or compatibility.





Modified the terminal block detector switch to increase the size of the switch lever. The increased size of the switch lever allows additional tolerance to assure contact with the terminal block actuator.



Initial Release


ST. LOUIS, Feb. 1, 2019 – Emerson today announced it has completed the purchase of Intelligent Platforms from General Electric.
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