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Tech Support

GE Fanuc PLC Tech Support – FAQs – Series 90 - 70 PLC

Please click below to find the answers to our most Frequently Asked Questions (FAQ):

What software is available to program and troubleshoot Series 90-70 PLCs?

There are 3 software packages available for this purpose.

Logicmaster 90-70 – This is the original software for the Series 90-70. It is DOS-based and can run in Windows 95, 98 and 2000 environments. It is not supported by GE Fanuc in Windows XP and Vista environments. This is a mature product, meaning no further enhancements are planned.

VersaPro Professional Edition – This is a Windows-based package and can run in Windows 95, 98, 2000 and XP environments. It is not supported by GE Fanuc in the Windows Vista environment. In addition to the Series 90-70, VersaPro Professional can also program Series 90 Micros, 90-30s, and certain VersaMax Micro and modular PLCs. This is also a mature product.

Proficy Machine Edition Logic Developer PLC Professional Edition – This is a Windows-based package and can run in Windows 2000, XP and Vista environments. This is the current software package for Series 90-70 PLCs. It supports all of the same PLCs as VersaPro Professional plus the RX3i and RX7i PACs. Enhancements to this software are on-going. This is the only software that will support new PAC, Series 90-30 and VersaMax CPUs and modules as they come out.

To learn about these programming options, click here.

When I try to download the configuration to my Series 90 CPU, the download fails because passwords are disabled. How do I fix this?

This error occurs when the user tries to download a configuration where the CPU is configured for “Passwords Enabled” and the CPU being downloaded to is set for “Passwords Disabled.” Once passwords are disabled in a Series 90 CPU, the only way to download a configuration where the CPU is configured for “Passwords Enabled” is to completely erase the memory in the target CPU. This can be done by powering down the CPU, disconnecting the battery, and powering up the CPU with the battery still disconnected. This should clear the memory. In certain cases with the Series 90-30 CPUs, you may have to clear the memory by shorting out a super-capacitor on the CPU module by removing the CPU from the baseplate and shorting across two solder pads labeled “MEM CLR” for about 10 seconds. Once the memory is erased, a configuration with passwords enabled can be downloaded to the CPU.

An alternative solution would be to change the configuration being downloaded to a “Passwords Disabled” setting and then download the configuration to the CPU. Only do this when passwords are not a concern.

My Series 90 CPU stopped. How do I identify the cause?

Take note of the LEDs on the power supply and the CPU. Key LEDs are the POWER LED (power supply health) and the OK LED (CPU health).If these are OK, use one of the available programming packages (Logicmaster 90, VersaPro or Proficy Machine Edition Logic Developer PLC), connect to the Series 90’s programming port and display the PLC and I/O fault tables. These should lead you to the root cause of the stoppage. Please note that if the CPU’s OK LED is out, the software will not communicate.

I have just assembled a Series 90-70 system and the CPU’s OK LED is off. I have replaced the CPU and the problem persists. What could be wrong?

The most likely cause is that the rack that the CPU is located in is not configured with the proper rack number. The rack that contains the CPU should always be set to Rack 0. Any other setting will result in the CPU’s OK LED being off. To check the settings, disconnect power from the power supply and remove it from the rack. In the upper left-hand of the rack, there are several jumpers that are used to assign a rack number to the rack. (Refer to the manual GFK-0262 for a diagram of the jumpers.) Set the rack umber to 0.

My PC will not communicate to the programming port on my Series 90 CPU. What are the possible causes of this problem?

There are several possibilities:

Bad port on the PC – Try using the PC’s serial port to communicate to another device in order to confirm proper operation

Bad cable – Try connecting to another Series 90 PLC in order to confirm the condition of the cable.

Incorrect communication settings in the software – The default settings for the Series 90 CPU programming port is 19200 BAUD, 8 data bits, 1 stop bit and odd parity. In cases where you suspect that the setting has changed and you have a copy of the PLC configuration, compare the CPU’s port configuration to your software’s port settings.

Bad programming port – Check the +5 volt pin (pin 5) on the programming port versus pin 7 (0 volts). If the +5 volts is not present, the fuse for that port is blown and this fuse is not field-replaceable.

If none of these suggestions solves the problem, please contact our technical support specialists at 1-866-599-6507.