App - 27
APPENDICES
(10) Debugging and fault diagnostics instructions
Classification Symbol Description
Error check
• Executes the CHK instruction when it is executed.
• Causes a jump to the step following the step of the CHK instruction
when it is not executed.
• When normal SM80: OFF, SD80: 0
• When abnormal SM80: ON, SD80: fault No.
• Indicates the start of ladder pattern change for the ladders to be
checked with the CHK instruction.
• Indicates the end of ladder pattern change for the ladders to be
checked with the CHK instruction.
Status latch
• Executes status latch.
• Resets the status latch to enable re-execution of status latch.
Sampling trace
• Triggers sampling trace.
• Resets the sampling trace to enable re-execution of sampling trace.
Program trace
• Triggers program trace.
• Resets the program trace to enable re-execution of program trace.
• Executes program trace.
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