Mitsubishi Electric MELSEC iQ-RX40NC6B, Руководство пользователя приложения

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10 FUNCTIONS
10.4 Input Diagnostic Function
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Input dark test function
This function outputs test pulses to turn off external input signal (X00 to X0F) that are ON and diagnoses contacts including
external devices for failure. Such a fault as adhesion, short-circuit, and failure in a circuit can be detected. Also, the test pulse
OFF time or the number of pulses to be output that are used for one diagnosis process can be set according to the usage
environment.
To execute the input dark test function, use test pulse output terminals (T0, T1) and connect input equipment. Use the input
terminals and test pulse output terminals of the input module with diagnostic functions in the following combinations.
• For the RX40NC6B (Main) and the RX40NC6B (Sub), wire even-numbered input terminals with T0 test pulse output
terminals.
• For the RX40NC6B (Main) and the RX40NC6B (Sub), wire odd-numbered input terminals with T1 test pulse output
terminals.
When a connection is made to test pulse output terminals in an incorrect combination, it is judged that a disconnection
occurred and an input dark test error (error code: 1401H) will occur.
Operation when an error is detected
When an error is detected during input dark test diagnostics, an input dark test error (error code: 1401H) will occur. In
addition, the input point where an input dark test error was detected turns off.
For the input point where an input dark test error was detected, check it with Input dark test error detection state (Un\G1040)
because a bit of the corresponding input point in this buffer memory area turns on.
RX40NC6B(Main) RX40NC6B(Sub)
Input terminal Test pulse output terminal Input terminal Test pulse output terminal
X00 T0 X00 T0
X01 T1 X01 T1
to to
X0E T0 X0E T0
X0F T1 X0F T1
NC
NC
X0 X0
T0 T0
RX40NC6B(Main) RX40NC6B(Sub)
Test pulse Test pulse
Test pulse Test pulse