3 Part Names and Functions
3 - 30
NX-series Safety Control Unit User’s Manual (Z930)
• Operation for Single Channel: Test Pulse Evaluation Error for Stuck-at-high Error
*1. This is the time that the error status (control data, status data, and indicator status) is held (1 s min.).
• Operation for Dual-channel Equivalent Inputs: Normal Operation
Safety input terminal
Safety input data
I/O indicator (yellow)
I/O indicator (red)
OFF ON
Error
detected.
Cause of
error
removed.
OFF
*1
Safety input terminal 0
Safety input terminal 1
Safety input data 0 before
dual evaluation
Safety input data 0
Safety input data 1 before
dual evaluation
I/O indicator (yellow) 0
I/O indicator (yellow) 1
I/O indicator (red) 0
I/O indicator (red) 1
OFF ON
Discrepancy
time
OFF
OFF ON OFF
Discrepancy
time
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