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4 Safety Control Unit Operation
Safety input data 0 before dual evaluation
Safety input data 1 before dual evaluation
*1. This is the time that the error status (control data, status data, and indicator status) is held (1 s min.).
Errors Detected during Self-diagnosis
The errors that can be detected for safety input terminals are determined by the parameter settings.
The following table gives the errors that are detected for each parameter setting.
l Devices with Mechanical Contacts and Devices with Semiconductor Out-
puts
Single/Dual
Single Channel
4 - 28
Safety input terminal 0
Safety input terminal 1
Safety input data 0
I/O indicator (yellow) 0
I/O indicator (yellow) 1
I/O indicator (red) 0
I/O indicator (red) 1
Setting
Test pulse
Without Test Pulse
With Test Pulse
OFF
ON
OFF
ON
Discrepancy
time
*1
Error detection
Contact
with posi-
Ground fault
tive side of
power line
Not detecta-
Not detectable.
ble.
Detectable.
Detectable
when input
turns ON.
NX-series Safety Control Unit User's Manual (Z930)
OFF
OFF
Short
circuits
*1
Disconnection
in input
wiring
Not detectable.
---
Not detectable.
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Troubleshooting
