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Output Diagnostic Function; Output Dark Test Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Cc-link ie field network waterproof/dustproof remote i/o module (with safety functions).
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7.4

Output Diagnostic Function

Output dark test function

This function outputs test pulses to turn off the external output signals (NZ2GFS12A2-16DTE: Y0 to Y3, NZ2GFS12A2-14DT:
Y0 to Y1) that are on for a short time and diagnoses the internal circuit for failure.
When failure is detected, a minor error occurs. The module will recover from the error by eliminating its cause.
For NZ2GF12A2-16DTE, the following can be detected: Internal circuit fixing, a short circuit on the power supply caused by an
external output signal, and a short circuit caused by another safety output in one M12 connector.
For NZ2GF12A2-14DT, the following can be detected: Internal circuit fixing, a short circuit on +24V caused by a source output
signal, a short circuit on 24G caused by a sink output signal, and disconnection of an output signal.
In addition, the OFF time for test pulses can be set depending on the usage environment.
• NZ2GFS12A2-16DTE
+24V(L PW)
Load power supply
24G(L PW)
• NZ2GFS12A2-14DT
+24V(L PW)
Safety remote I/O
Load power supply
module
24G(L PW)
Depending on a timing, the output dark test pulse width may be shorter than the time set in "Output dark test
pulse time".
Output circuit
Safety remote I/O
module
Read-back
circuit
Output circuit
Read-back
circuit
Y0
Test pulse
Y1
MC
24G(L PW)
Test pulse
Y0+
MC
Load
Test pulse
Y0-
Test pulse
MC
Load
Load
MC
Load
7 FUNCTIONS
7.4 Output Diagnostic Function
7
57

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