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RX3i NIU001 Communication

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SKU 2173434  UPC 0471834121733


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Product Description

The IC695NIU001 is an Ethernet Network Interface Unit from the GE Fanuc RX3i Series.  This module makes it possible to use PACSystems RX3i and Series 90-30 I/O remotely on an Ethernet network.  See specifications for this unit on IC695NIU001's website page.

Technical Specifications

Module Type: Network Interface
Number of Slots: 1 (single slot)
Backplane Support: Dual:  RX3i PCI and 90-30 Serial  
Protocol Support: SNP, Modbus Slave, Serial I/O, Modbus Master 
Communication Ports:   (2) RS-232 and RS-485
Internal Power: 0.52A @ 3.3 VDC, 0.95A @ 5VDC


Technical Information

Specifications for IC695NIU001 PLUS


Real Time Clock battery life

Estimated 5 years. Battery must be replaced every 5 years on a regular maintenance schedule.

Note: The module is shipped with a pull-tab on the battery. The pull-tab should be removed before installing the module.

Power requirements

+3.3 VDC: 0.52 Amps nominal

+5.0 VDC: 0.95 Amps nominal

Operating Temperature

0°C to 60°C (32°F to 140°F)

Floating point


Boolean execution speed, typical

0.072 ms per 1000 Boolean instructions

Embedded communications

RS-232, RS-485

Serial Protocols supported

Modbus RTU Slave, SNP, Serial I/O, Modbus RTU Master by application “C” block


Dual backplane bus support: RX3i PCI and 90-30-style serial

PCI compatibility

System designed to be electrically compliant with PCI 2.2 standard


RS-232 Serial Port

RS-485 Serial Port

External isolation recommended. (For details, see RS-485 Port Isolator, IC690ACC903,



Troubleshooting IC695NIU001

Troubleshooting information is available on IC695NIU001's website page; it also includes a datasheet user-manual and a wiring diagram.

Repair your IC695NIU001

PDF Supply can repair your IC695NIU001 in 3-5 business days. And PDF Supply stands by all of its repairs with a 1 year customer satisfaction warranty.


How to Check the Forced Value Variable in PACSystem


Check the forced value variable in PACSysterm


  1. On all CPU modules in PACSystem, as well as the IC695NIU001 module, there is a LED named as I/O FORCE. And the LED will turn on once there is at least one forced bit in ME.
  2. In the system variable, there is one %S0011. This system bit will be set once there is at least one forced bit in ME.
  3. When ME goes online with PLC, we find a Forces in controller report in ME by right clicking target name and then choosing report. In this report, we can find out the variable list for the forced variable.
  4. In the SVC_REQ block, the command 18 can be used to find out whether there is forced value in ME.

Note: For the #OVR_PRE reference, %S00011, which indicates whether one or more overrides is active, is not supported by the Redundant CPU and should not be used. At the same time, the LED I/O FORCE on the redundant CPU is not available to show whether there is one or more override. For the redundant system, we can just refer to the method 3 and 4 to check the forced value.


How To Set Update Timeout For EGD Communication


Customer should set the proper Update Timeout value in the consumed exchange


The Update Timeout of the Consumer should be at least 3x the Produced Period + 2mSec, for RX3i and ENIU(IC695NIU001) application.

Refer to gfk-2439D page 8-10 for a table listing the suggested consumed timeout values (notice all timeout values are 3x + 2mSec of the produced period).


More detail information about EGD communication, please refer to GFK-2224 PACS_Ethernet_Manual

More detail information about Ethernet Network Interface Unit, please refer to GFK-2439 PACSystems RX3i Ethernet NIU Manual


Timeout Value for Consumed Exchange with IC695NIU001


The RX3i ENIU (IC695NIU001) has the ability to set its outputs to Defaults or to hold their last states when communications with the controller(s) is lost. This is done via the produced exchange from the controller(s) by using "Control" words. The Control Words are defined as:


Control Data Format

The first 10 words of data consumed by the Ethernet NIU are control data. They determine the behavior of outputs if communications are lost, and can be used to clear faults. In addition, if there are two controllers, the control data determines which of them will supply the I/O Station outputs. (See GFK-2439 for more info).

The NIU determines the states of the outputs based on certain bits being set in the Control Word(s) being sent from the Controller(s) once communications are lost:

The Ethernet NIU moves the discrete and analog output data to the %Q and %AQ tables after determining that data is being received from an active controller. If no active controller is available then ENIU moves zeros, hold last state, or default values to the %Q and %AQ tables as directed by the control bit from the last active controller.

If the Timeout value for the consumed exchange(S) at the NIU are set to a value of 0, this means that the exchange never times out then the state as determined by the Control Word does not take effect at the NIU.


Customer Questions and Answers

  • Question:  What is an IC695NIU001?  Answer:  The IC695NIU001 is an Ethernet Network Interface Unit from the GE Fanuc RX3i Series.
  • Question:   What does IC695NIU001 do?   Answer:  This unit makes it possible to use PACSystems RX3i and Series 90-30 I/O, remotely, on an Ethernet network.
  • Question:  What happens after IC695NIU001 is set up by configuration?   Answer:  After configuration, data exchange is completely automatic. System control can be provided by any master device capable of exchanging Ethernet Global Data (EGD). 
  • Question:  What does IC695NIU001 provide?   Answer:  IC695NIU001 automatically provides the controller with status information in each exchange. The application program logic in the controller can monitor this status data and issue appropriate commands to this unit.
  • Question:  Of what does IC695NIU001 consist?   Answer:
    • an RX3i Universal Backplane (IC695CHS0xx)
    • an RX3i power supply (IC695PSxxxx)
    • the RX3i Ethernet NIU (IC695NIU001)
    • 1 or more RX3i Ethernet modules (IC695ETM001)
    • proprietary application software
    • optional Series 90-30 expansion backplanes
    • PACSystems RX3i and/or Series 90-30 modules, as appropriate for the application
  • Question:  What are some of the features of IC695NIU001?   Answer:
    • 20 Kbytes of optional local logic. Supports all languages except C programming.
    • 10 Mbytes of built-in flash memory for local user data storage.
    • Battery-backed Real Time Clock.
    • In-system upgradeable firmware.
    • 2 serial ports: an RS-485 serial port and an RS-232 serial port
    • Supports Ethernet communications via the backplane-based Ethernet Interface module (IC695ETM001)
    • Data exchange using EGD
    • TCP/IP communication services using SRTP
    • Comprehensive station management/diagnostic tools
    • Supports operation with redundant controllers
    • PACSystems RX7i and RX3i controllers can send selected COMMREQs to the RX3i ENIU via EGD. The ENIU executes the COMMREQs and returns the results to the controller. 
    • During EGD configuration, RX3i Ethernet interfaces are identified by their Backplane/Slot locations.
    • Supports display of module hardware revision, serial number, and date code in Machine Edition Logic Developer software.
  • Question:  What should I do if my IC695NIU001 is not working properly?  Answer:  Your IC695NIU001 may need repair.

For more information on the IC695NIU001 Ethernet Network Interface Unit of the GE Fanuc RX3i Series, please see the Datasheet User-Manual.


Release History

Catalog Number





The internal FLASH drive that holds the firmware and backs up user data updated to a new vendor. This change address an issue in which a small percentage of IC695NIU001 units may not properly power up after a power cycle. Revision ADAD resolves this issue.



Adds native support for the new Power Sync and Measurement module (IC694PSM001) and resolves several issues. Also introduces new features to augment security in the CPU firmware and Proficy Machine Edition software. For details, see “New Features and Enhancements” on page 6 and “Problems Resolved in Release 7.15” on page 8.



Corrects an issue where executing a Run Mode Store, displaying the Proficy Machine Edition Show Status window, or requesting data using the PACSAnalyzer tool could cause discrete output modules to unexpectedly change state momentarily (up to one PLC scan).

Corrects an issue that was introduced in release 7.13, which prevented configuration of Modbus TCP on Ethernet modules.



Corrects issues with Logic Write to Flash (Service Request 57).



Corrects an issue that occurred when using half duplex (Modbus 2 wire) communications. For details, see GFK-2598C.



Agency requirement.

The new hardware is EU-ROHS compliant. For details, see GFK-2598B.



Initial release of NIU001 PLUS with 1.1GHz processor



Provides OEM protection in flash-based systems that do not use a battery. See GFK-2419P for details and problems resolved.



See GFK-2419N for new features and problems resolved.



Enables support that is functionally identical to the IC695CMX128 for the IC695RMX128.



Corrects the problem described in GFK-2419L.



corrects the problems listed in GFK-2419L.



Supports Run-mode store of EGD. Adds support for LREAL data type.



See GFK-2419H for issues resolved.



Refer to GFK-2419G for issues resolved.



Refer to GFK-2419F for new features and issues resolved.



Refer to GFK-2419E for new features and issues resolved.



Refer to GFK-2419D for new features and issues resolved.



Supports eight ETM modules in the main backplane.



Refer to GFK-2419B for issues resolved.



Refer to GFK-2419A for issues resolved.



Initial release of NIU001.


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