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RX3i APU300 Specialty

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Common misspellings:
  • 1C694APU300
  • IC69AAPU300
  • IC694APU3o0
  • IC694APU30o
  • IC694APU300

Technical Specifications for IC694APU300

ManufacturerGE Fanuc
SeriesRX3i PACSystems
Part NumberIC694APU300
Product TypeHigh-speed counter module
Maximum Pulse Signal Frequency1 Megahertz
Voltage TypeDC
Number of Positive Logic Outputs4
Number of Positive Logic InputsNumber of Positive Logic Inputs
DIP SwitchesNone
Maximum Processing Speed80 kilohertz

Product Description

 IC694APU300 is a Fanuc GE PLC output model built for high speed and processing of rapid signals of frequencies of up to 1 Mhz. The module intuitively detects inputs and processes the input’s information count without having to communicate with a CPU (Central Processing Unit). The output module can be configured to accommodate 1 complex counter, 2 identical and independent complex counters, as well as 4 identical simple counters. The module is ideal for control applications such as measurement of velocity, process control, turbine flowmeter, and meter proving.

For input memory, the High-speed counter uses 16 words, and this is inclusive of 16 bits of discrete input memory and 15 words of analog input memory. Furthermore, the high-speed counter makes use of 16 bits of discrete output memory which get transferred once for every sweep. It’s worth mentioning that there are no DIP switches on the module.

The IC694APU300 module provides two modes of operation in an RX3i system: Classic and Enhanced.

For enhanced mode, the data status of the module delivers 32 bits of diagnostic information to the CPU about module operation. Whereas in the classic mode, module Status data delivers 16 bits of diagnostic information to the CPU about module operation.

It’s worth noting that high-speed counters: IC693APU300-MA and IC694APU300-CA do not support hand held programmer configuration. LED indicators responsible for indicating the module’s operating status as well as status of other configuration parameters.

IC694APU300 output module is comprised of 4 positive logic outputs and 12 positive logic inputs delivering input voltage range of between 5V DC or 10 to 10 V.

Furthermore, the module comes packed with internal module diagnostics, and a removable terminal board that comes in handy during field wiring. These inputs are updated once per CPU sweep.

Power for operation of the module’s logic circuitry comes from the backplane’s 5 VDC bus. For the input and output devices, the power sources are supplied by the user or +24 VDC output.

During installation, it’s recommended that the product is installed in an enclosure with minimal pollution. Wiring connections should be made using Copper wires. If two wires are used, then they must be the same size. During field wiring, the shielded cable should be used for all cables connecting to the high-speed counter and must have a high frequency ground within 6 inches of the IC694APU300 PLC module.

Ensure the power is turned off during installation or replacement of any parts such as batteries, fuses or any other serviceable components to avoid any hazardous incidences.

Technical Specifications

Processing Speed: 80 kHz
Input Voltage Range:  5 VDC or 10-30 VDC (TSEL open) 
Output Voltage Range:   10-30VDC @ 500mA or 4.75-6VDC @ 20mA 
Module Type: High Speed Counter
Input/Output Type: Positive Logic
Power Consumption:  250mA from 5V bus


The IC694APU300 module from GE Fanuc is an industrial high-speed counter module. It is manufactured by GE Fanuc in the RX3i PACSystems series. The IC694APU300 high-speed counter module is designed to handle high-speed pulse signals, and it uses these high-speed pulse signals to flow rate measurement applications, speed control applications, and other dynamic industrial applications. This counter module can safely handle pulse signals that have frequency ratings of up to 1 Megahertz. It can perform complex equations within the space of a fraction of a second. The IC694APU300 high-speed counter module runs on DC power. Its input voltage ratings can be either 5 Volts DC or 10 to 30 Volts DC, and its output voltage ratings can be either 10 to 30 Volts DC with a current rating of 500 milliamps or 4.75 to 6 Volts DC with a current rating of 20 milliamps.


The GE Fanuc RX3i PACSystems IC694APU300 high-speed counter module comes with 4 positive logic outputs and either 12 positive logic inputs that are single-ended or 6 positive logic inputs that are differential. The power consumption rating of the IC694APU300 high-speed counter module is 1.25 Watts or 250 milliamps. Its maximum rated processing speed is 80 kilohertz. This counter module does not need to be connected to a programmable logic controller (PLC) or to the central processing unit (CPU) in the PLC to be able to operate. It can operate independently. There are no DIP switches on the IC694APU300 high-speed counter module. All of its wiring should be done with copper wires.

Technical Information



Power Consumption Output Points Maximum Count Rate LEDs


Field to Backplane (optical) and to Frame Ground (FG)

Group to Group


250 mA (1.25 watts) from 5 V bus on the backplane Powered by user supplied 4.7 to 40 V dc

1 MHz, (Duty Cycle 25% to  87%)

BOARD OK, CONFIG OK, Field Power OK, Input Status, Output Status


250 V ac continuous, 1500 V ac for one minute

250 V ac continuous, 1500  V ac for one  minute



Voltage Range

5 V dc (TSEL jumpered to INCOM)


10 to 30 V dc (TSEL open)

Number of  Positive  Logic Inputs

12 (Single Ended) or 6 (Differential)

Input Thresholds (I1 to I12)

5 V dc Range 10 – 30 V dc Range

Von (minimum)

3.55 V 8.35 V

Ion (minimum)

3.2 mA 3.2 mA

Voff (maximum)

1.5 V 2.4 V

Ioff (maximum)

0.8 mA 0.8 mA

Survivable Peak Voltage

± 500 V for 1μSec

Transient Common Mode Noise

1000 V/ μSec  minimum



Input  Impedance

Refer to the section Input Impedance for V-I  characteristics.



Voltage Range

4.7 to 40 V dc at 1.5A maximum resistive load,  0.5A maximum pilot duty

Off  State  Leakage Current

10 μA  maximum per point

Output  Voltage Drop

0.5  V  maximum at 500 mA


1.5 V maximum at 1.5 A†

Inrush Current

1.6A without ESCP tripping

CMOS Load  Drive Capability


Positive  Logic Outputs


Output Protection

Outputs are protected for overcurrent (ESCP) with self-healing capability

Reverse  Polarity Protection

Outputs protected from reverse wiring between OUTPWR and OUTCOM terminals

Note: The output voltage drop should be considered while driving full load (> 1 A) at low voltage below 6 V.

For product standards, general operating specifications and installation requirements, refer to the following documents:

  • Series 90-30 PLC Installation and Hardware Manual (GFK-0356)



Troubleshooting IC694APU300

Troubleshooting information is available on IC694APU300's website page; it also includes a datasheet user-manual and a wiring diagram.


Repair your IC694APU300

PDF Supply can repair your IC694APU300 in 3-5 business days. And PDF Supply stands by all of its repairs with a 1 year customer satisfaction warranty.

Changes in APU300 behavior


The redesigned IC693APU300-MA and IC694APU300-CA are supposed to behave identically to previous versions, but parameter validation has been made stricter. On older units, attempting to load the accumulator with a value outside of the high or low limits would result in the accumulator being set to the limit value. The setpoints operate in a similar way. Also, the unit would allow you to change the limits such that the present values of the accumulator and setpoints were outside of the limits. On the new model APU300s, attempting to create any of these circumstances will result in a module fault and an invalid parameter error.


When changing module settings in logic, this is the safest process:

  1. Set high and low limits to very high and very low values.
  2. Load accumulator and setpoints.
  3. Reset limits to values that encompass the setpoints and accumulator.


Customer Questions and Answers

  • Question:  What is an IC694APU300?  Answer:  The IC694APU300 is a High-Speed Counter module from the GE Fanuc RX3i Series. 
  • Question:   What does IC694APU300 provide?  Answer:  This module provides direct processing of rapid pulse signals up to 80 kHz.
  • Question:   What can IC694APU300 do?   Answer:  This module can sense inputs, process the input count information, and control the outputs without having to communicate with a CPU.
  • Question:   How many bits of discrete input memory (%I) does IC694APU300 use?  Answer:  16 bits
  • Question:   How many words of analog input memory (%AI) does IC694APU300 use?  Answer:  15 words
  • Question:   How many bits of discrete output memory (%Q) does IC694APU300 use?  Answer:  16 bits
  • Question:   The configuration for this module can be set up for IC694APU300 to have:  Answer:  
    • 4 identical, independent simple counters
    • 2 identical, independent more complex counters
    • 1 complex counter
  • Question:   What do the 2 green LEDs indicate?  Answer:  They indicate the operating status of the module and the status of configuration parameters.
  • Question:   What do some of the features of IC694APU300 include?  Answer:  
    • 12 positive logic (source) inputs with input voltage range selection of either 5 VDC or 10 to 30 VDC
    • 4 positive logic (source) outputs
    • Counts per timebase register for each counter
    • Internal module diagnostics
    • A removable terminal board for field wiring
  • Question:  Into what slot can IC694APU300 be installed?  Answer:  This module can be installed in any I/O slot of an RX3i system.
  • Question:   What should I do if my IC694APU300 is not working properly?  Answer:  Your IC694APU300 may need repair

For more information on the IC694APU300 High-Speed Counter Module of the GE Fanuc RX3i Series, please see the Datasheet User-Manual.


Release History


Firmware Release








Nov 2015

Hardware release only. New hardware replaces the existing hardware revision in production after full consumption of previous revision FAB boards (C0 rev). This is applicable for both Rx3i and 90-30 systems.



Oct 2014

Resolves issue of reading counter value incorrectly.






July 2014

Hardware upgrade only. Addresses issues related to output behaviour at elevated temperatures. Field modification cannot be performed in the field.



June 2013

Resolves an issue where using the internal oscillator in Classic mode generated a measurement error.



Aug 2012

Adds Enhanced mode features for use in RX3i systems. Hardware update to resolve component obsolescence issues.


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