Chapter 6 Function of CPU Module
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6.8 Fault Mask
1) Purpose and Operation Overview
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Fault Mask is the function to continue the program execution even if the module error occurs during
operation. The module assigned as Fault Mask shall be operated normally before error occurs.
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If the error occurs in the module where the Fault Mask is set, the corresponding module stops the operation
but the whole system continues the operation.
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If the module error occurs during operation, CPU module will set the error flag and the front “PS LED” shall
be “ON”. If connecting XG5000, you can see the error state.
2) Fault Mask Setting Method
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The Fault Mask Setting is available on the online menu of XG5000. For further information, please refer to
XG5000 user’s manual.
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The Fault Mask Setting is also available by setting the Fault Mask flag by program. (Please refer to
Appendix 1 Flag List.)
3) Release of Fault Mask
The Fault Mask is released only by the same method as the setting.
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Setting release from online menu of XG5000.
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Automatic release in case that memory backup is broken by battery voltage falling.
The Fault Mask shall not be released in the following cases. Cares should be taken.
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Power Off
Æ
On
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Change of operation mode
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Program download
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Operation of reset key
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Data clear
Notes
1) If releasing the Fault Mask in the state that error flag of CPU module is not deleted even if the
cause of error occurrence is removed, the system stops. Before releasing the Fault Mask flag,
check the state of error flag.
