5. PROCEDURES BEFORE SYSTEM OPERATION
MELSEC-A
5-6
5.4 Self-diagnosis
Execution
Method
(1) Self-diagnosis
method
The AJ71PB96F/A1SJ71PB96F self-diagnosis method is conducted using the following
procedure.
(a) Set the mode setting switch to “2.”
(b) The PC CPU will stop.
(c) The PC power will turn on. In addition, the PC CPU will be reset.
(d) The AJ71PB96F/A1SJ71PB96F self-diagnosis will be executed, and results will be displayed
using the LEDs (B0 to B6).
(2) Test results
The results of the executed test are displayed as shown below (LED B0 to B6 display status).
Test item
LED
B6 B5 B4 B3 B2 B1 B0
TEST
(a) MPU test
During test
Error
(b) Timer test
During test
Error
(c) Interrupt test
During test
Error
(d) DRAM test
During test
Error
: Turned off
: Turned on
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.
