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4 Safety Control Unit Operation
Single/Dual
Dual Channel Equivalent 0
Dual Channel Comple-
mentary
*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
Single/Dual
Safety Mat/Safety Edge
*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)
• Operation for Single Channel: Test Pulse Evaluation Error by Stuck-at-high Error
4 - 26
Input signals on the safe-
ty input terminals
Si (n)
Si (n+1)
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
Safety mat/safety
edge status
Si (n)
Without load
1
With load
0
OFF
ON
Safety input data
Si (n)
Si (n+1)
0
*1
0
0
*1
0
0
*1
0
1
*1
0
0
*1
0
0
*1
0
1
*1
0
0
*1
0
Safety input data
Si (n+1)
*1
0
*1
0
OFF
NX-series Safety Control Unit User's Manual (Z930)
Meaning of status
Inactive (OFF)
Discrepant status
Discrepant status
Active (ON)
Discrepant status
Inactive (OFF)
Active (ON)
Discrepant status
n = Even number
Meaning of status
Active (ON)
Inactive (OFF)
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Table of Contents
Troubleshooting
