Single/Dual
Input signals on the safe-
ty input terminals
Safety input data
Meaning of status
Si (n) Si (n+1) Si (n) Si (n+1)
Dual Channel Equivalent 0 0 0
0
*1
Inactive (OFF)
0 1 0
0
*1
Discrepant status
1 0 0
0
*1
Discrepant status
1 1 1
0
*1
Active (ON)
Dual Channel Comple-
mentary
0 0 0
0
*1
Discrepant status
0 1 0
0
*1
Inactive (OFF)
1 0 1
0
*1
Active (ON)
1 1 0
0
*1
Discrepant status
*1. If the terminals are set to Dual Channel Mode, the safety program in the Safety CPU Unit must access the
safety input data for the even-numbered terminal.
• Relationship between Safety Mat Status and Safety Input Data for Safety Mat/Safety Edge Inputs
n = Even number
Single/Dual
Safety mat/safety
edge status
Safety input data
Meaning of status
Si (n) Si (n+1)
Safety Mat/Safety Edge Without load 1
0
*1
Active (ON)
With load 0
0
*1
Inactive (OFF)
*1. If the terminals are set to Dual Channel Mode, the safety program in the Safety CPU Unit must access the
safety input data for the even-numbered terminal.
• Operation for Single Channel: Normal Operation
Safety input terminals
Safety input data
I/O indicator (yellow)
I/O indicator (red)
OFF ON OFF
• Operation for Single Channel: Test Pulse Evaluation Error by Stuck-at-high Error
4 Safety Control Unit Operation
4 - 26
NX-series Safety Control Unit User's Manual (Z930)
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