Output Diagnostic Function; Output Dark Test Function - Mitsubishi Electric NZ2GFSS2 32D S1 User Manual

8.4

Output Diagnostic Function

Output dark test function

This function outputs test pulses to turn off the external output signal Y that is on and diagnoses the internal circuit for
failure. The read-back circuit checks the test pulse and output circuit fixing can be detected. The OFF time for test pulses and
the number of pulse outputs used in one diagnostic can be set depending on the usage environment.
IO24V
External power supply
IO24G
Operation at error detection
When the module detects an error in a diagnostic of the output dark test, the error (output dark test error) state is applied and
all output points are turned off. For details on the error state, refer to the following.
Page 138 Error codes related to the safety remote I/O module
For the NZ2GFSS2-32D-S1, when an error is detected in the input dark test, output dark test, or output read-
back diagnostic, the minor error state is applied to the module. However, when multiple errors are detected
and all I/O points of the module are turned off, the error state of Self-diagnostic error (error code: 0101H) is
applied.
Output circuit
Safety remote I/O
module
Read-back
circuit
Y0
Test pulse
Y1
MC
Load
COM-
Test pulse
MC Load
8 FUNCTIONS
8.4 Output Diagnostic Function
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