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RX3i CRU320 CPU Processor

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SKU 2170043  UPC 0843830473282


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Technical Specifications for IC695CRU320

ManufacturerGE Fanuc
SeriesRX3i PACSystems
Part NumberIC695CRU320
Product TypeCPU
Voltage+3.3V DC: 1.0 Amp nominal, +5V DC: 1.2 Amps nominal
Operating Temperature0 to 60 degrees Celsius
Boolean Execution Speed0.047 ms per 1000 Boolean instructions
Elapsed Time Clock Accuracy+/-0.01% maximum
Embedded CommunicationsRS-232, RS-485 ports
Serial Protocols SupportedModbus RTU Slave, SNP, Serial I/O

Product Description

The IC695CRU320 is a 1 GHz CPU from the GE Fanuc RX3i PACSytems product line.  IC695CRU320  is a programmable automation controller that supports Hot Standby Redundancy. This robust design enables critical applications or processes to continue running even if an otherwise system-stopping failure occurs in any single component. The RX3i CPUs like IC695CRU320 are portable control engines, programmed and configured to control different machines, processes, and material handling systems in real time.  


The IC695CRU320 has two independent serial ports, and an Intel Celeron-M microprocessor. Its 64 MB of non-volatile flash memory supplements 64 MB of battery-backed random access memory (RAM).  IC695CRU320  also supports both local and remote expansion racks. The CPU has a serial backplane design compatible with expansion modules (but not main racks) in the Series 90-30 I/O product line. IC695CRU320 uses Proficy Machine Edition, the development environment common to all GE Fanuc controllers. Proficy Machine Edition is made specifically for creating, running and diagnosing operator interface, motion and control applications.


Eight indicator LEDs on the space-saving CPU chassis help with troubleshooting. Each LED  is associated with a separate function, except for the two LEDs labeled COM 1 and COM 2, which belong to different ports rather than to different functions. The other LEDs are CPU OK, Run, Outputs Enabled, I/O Force, Battery, and Sys Flt -- which is an abbreviation for "system fault." The I/O Force LED indicates whether Override is active on a bit reference. Other LED labels are self-explanatory.  IC695CRU320 chassis design puts all LEDs and both serial ports facing forward for the sake of easy access and visibility.

Technical Specifications

Processing Speed: 1 GHz
CPU Memory: 64 Mbytes
Floating Point: Yes
Serial Ports: 2
Serial Protocols: SNP, Serial I/O, Modbus Slave and Master 
Embedded Comms:   RS-232, RS-486


The GE Fanuc IC695CRU320 RX3i Central Processing Unit is a solid-state automation computer designed and built by GE Fanuc to be used as the logical brain of an application that is implemented by using the RX3i PACSystems platform. One of the most interesting features of this PLC CPU is its capacity to support what is known as “hot standby redundancy,” which means that the users can set up and configure 2 RX3i CPUs to perform the same function in a given application. This feature gives the GE Fanuc IC695CRU320 RX3i Central Processing Unit a great deal of flexibility, in order to guarantee processor redundancy and minimize downtime for time-critical applications. Two built-in serial communication ports, which are one RS-232 port and one RS-486 port, enable this CPU to integrate into the end user’s control algorithm.

The GE Fanuc IC695CRU320 RX3i Central Processing Unit is made of hard and durable plastic, and comes from the factory in an open-style enclosure which is not designed for operation in an industrial environment with high levels of humidity, dirt, debris, or water. For this reason, it is strongly recommended to install the GE Fanuc IC695CRU320 RX3i Central Processing Unit in a properly protected enclosure so that the environmental parameters specified by the manufacturer can be maintained at all times and so the CPU will be safe. Its operating temperature should be kept between 0 and 60 degrees Celsius (32 to 140 degrees Fahrenheit). This CPU can be installed in a GE Fanuc PLC system by means of an RX3i PCI or a Series 90-30-style serial backplane bus.

Technical Information

CPU Performance

For CRU320 performance data, refer to Appendix A of the PACSystems CPU Reference Manual, GFK-2222W or later.

Battery: Memory retention

For battery selection, installation and estimated life, refer to the PACSystems RX3i and RX7i Battery  and  Energy  Pack Manual, GFK-2741

Program storage

Up to 64 MB of battery-backed RAM

64 MB of non-volatile flash user memory

Power requirements

+3.3 Vdc: 1.0 Amps nominal

+5 Vdc: 1.2 Amps nominal

Operating Temperature

0 to 60°C (32°F to 140°F)

Floating point


Time of Day Clock accuracy

Maximum drift of 2 seconds per day

Elapsed Time Clock (internal timing) accuracy

0.01% maximum

Embedded communications

RS-232, RS-485

Serial Protocols supported

Modbus RTU Slave, SNP, Serial I/O


Dual backplane bus support: RX3i PCI and high-speed serial bus

PCI compatibility

System designed to be electrically compliant with PCI 2.2 standard

Program blocks

Up to 512 program blocks. Maximum size for a block is 128KB.


%I and %Q: 32Kbits for discrete

%AI and %AQ: configurable up to 32Kwords

%W: configurable up to the maximum available user RAM Symbolic: configurable up to 64 Mbytes

Flash memory endurance rating

100,000 write/erase cycles minimum

Memory error checking and correction (ECC)

Single bit correcting and multiple bit checking.

Switchover Time1

Maximum 1 logic scan, minimum 3.133 msec.

Typical Base Sweep Time (Reference Data Transfer List Impact)2

3.66 msec: 1K Discrete I/O, 125 Analog I/O and 1K Registers

3.87 msec: 2K Discrete I/O, 250 Analog I/O and 2K Registers

4.30 msec: 4K Discrete I/O, 500 Analog I/O and 4K Registers

5.16 msec: 8K Discrete I/O, 1K Analog I/O and 8K Registers

Maximum amount of data in transfer list

Up to 2 Mbytes

Number of redundancy links supported

Up to two IC695RMX128/228 synchronization links are supported.


Troubleshooting IC695CRU320

Troubleshooting information is available on IC695CRU320's website page; it also includes a datasheet, a user manual, and a wiring diagram.


Repair your IC695CRU320

PDF Supply can repair your IC695CRU320 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 IC695CRU320?  Answer:  The IC695CRU320 is a 1 GHz Central Processing Unit with Hot Standby Redundancy from the GE Fanuc RX3i Series with an Intel Celeron-M microprocessor. 
  • Question:  What does Hot Standby CPU Redundancy in an IC695CRU320 do?  Answer:   Hot Standy CPU Redundancy allows a critical application or process to continue operating if a failure occurs in any single component. 
  • Question:  How many CPUs are required?  Answer:  A Hot Standy system uses two CPUs; and active unit that actively controls the process, and a backup unit that is synchronized with the active unit and can take over the process if it becomes necessary.
  • Question:  How does IC695CRU320 communicate with I/O and Intelligent Option modules?  Answer:  The CPU communicates over a rack-mounted backplane using the VME64 Standard format.
  • Question:  What else is required wtih the IC695CRU320 to accomplish redundancy?  Answer:  A Redundacy Memory Xchange module (IC695RMX128/228) configured as a redundancy link in each unit. 
  • Question:  What are some of the features of IC695CRU320?  Answer:
    • Contains 64 Mbytes of battery-backed user memory and 64 Mbytes of non-volatile flash user memory. 
    • Provides access to bulk memory via reference table %W. 
    • Configurable data and program memory.
    • Programming in Ladder Diagram, Structured Text, Function Block Diagram, and C.
    • Supports auto-located Symbolic Variables that can use any amount of user memory.
    • Reference table sizes include 32Kbits for discrete %I and %Q and up to 32K words for each analog %AI and %AQ. 
    • Supports most Series 90-30 modules and expansion racks.
    • Supports up to 512 program blocks. Maximum size for a block is 128KB.
    • Firmware may be upgraded in the field.
    • 2 serial ports- RS-485 serial port and RS-232 serial port.
    • Ethernet communications via the rack-based Ethernet Interface module (IC695ETM001).
    • Time Synchronization to SNTP Time Server on Ethernet network when used with Ethernet Release 5.0 or later module.
  • Question:  If I don't have any light on or the CPU is not functioning correctly - What does that mean?  Answer:  It means there is something wrong with your processor and it will need repair or maybe even replacement.


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