Self-Diagnostics - Mitsubishi Electric Melsec Q Series User Manual

5
SETTINGS AND PROCEDURES BEFORE SYSTEM
OPERATION

5.4 Self-diagnostics

The self-diagnostics of the QJ71PB92V performs a unit test on the QJ71PB92V.
It takes about 15 seconds to complete the self-diagnostics.
(1) Self-diagnostics execution procedure
5
- 7 5.4 Self-diagnostics
The following shows how to execute the self-diagnostics.
(a) When the QJ71PB92V is mounted on a redundant system, set the operation
mode of the redundant CPU to the Separate or Debug mode.
( User's manual for the redundant system for the CPU module used)
(b) Set the operation mode of the QJ71PB92V to Self-diagnostics mode (mode 2) by
either of the following methods:
1) Set 02 for Operation mode change request area (Un\G2255).
H
2) Turn on Operation mode change request signal (Y11).
(c) When the operation mode is set to Self-diagnostics mode (mode 2), the self-
diagnostics is automatically started.
During execution of self-diagnostics, the TEST LED is ON or flashing.
Upon completion of the self-diagnostics, the LEDs on the QJ71PB92V change as
shown below, storing the test result to the Offline test status area (Un\G2258).
• When normally completed: The TEST LED turns OFF.
• When failed: The TEST and FAULT LEDs are ON.
POINT
When using the QJ71PB92V in a redundant system and performing the self-
diagnostic test during system operation, set it to Self-diagnostic mode (mode 2)
according to the procedure shown in Section 9.4.3.