491
Description Hardware watchdog has been disabled
Possible Cause
• A runtime malfunction has disabled the hardware watchdog protective function.
• A hardware failure has disabled the hardware watchdog protective function.
Solution
• Reload the firmware and restart the I/O pack or module.
• If the problem persists, replace the I/O pack or module or the controller.
499
Description I/O pack is connected to an unknown board
Possible Cause
• The terminal board or auxiliary terminal board connected to the I/O pack or module is not recognized by this version of
firmware.
• This can occur if a new terminal board has been connected but the I/O pack is configured with firmware that does not
support the new hardware.
Solution
• Upgrade the ControlST software suite to a version that supports the new hardware.
• Download latest firmware and parameters to the I/O pack or module.
500
Description I/O pack is connected to the wrong terminal board
Possible Cause The I/O pack or module is connected to a recognized terminal board that is not supported.
Solution
• Refer to one of the following system guides for a list of supported hardware combinations: GEH-6721_Vol_II,
GEH-6855_Vol_II, GEH-6800, or GEH-6779. From the Start menu, select All Programs, GE ControlST,
Documentation.
• Verify that the I/O pack is connected to a terminal board that is supported.
• Replace the I/O pack or terminal board to create a supported combination.
• Use the ToolboxST application to reconfigure the I/O module.
Common I/O Module Functionality GEH-6855_Vol_II System Guide 473
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