Execution Method For Self-Diagnosis - Mitsubishi A1SJ71PB92D User Manual

5. PROCEDURES BEFORE SYSTEM OPERATION
5.4

Execution Method for Self-diagnosis

This section covers the procedure for entering the self-diagnosis mode and the LED displays
descriptions.
A self-diagnosis is automatically performed by setting the rotary switch to 2 and starting up (using the
power supply on or reset switch).
During an internal diagnosis the LED display corresponds to the B0 to B6 statuses and the test
responses being conducted are shown below.
(a) MPU test
(b) Timer test
(c) Interrupt test
(d) DRAM test
When the test results are normal, tests (a) to (d) are repeated. If an error is detected, then the
LED status at the tie the error occurs for that test will be displayed.
Meaning
During test
Error
During test
Error
During test
Error
During test
Error
5-6
B6 B5 B4 B3
MELSEC-A
B2 B1 B0 TEST
: Turned off : Turned on