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MELSEC-Q
8 TROUBLESHOOTING
(3) H/W Information
(a) Hardware LED information
The hardware LED information gives the following information.
1) Actual LED information
b15 b0
b2
ALM
ERR
RUN
2) LED1 information
b15 b0
bit Condition on which bit turns on bit Condition on which bit turns on
b0
Unused
b8
When CH1 loop disconnection is detected
b1
When CH2 loop disconnection is detected
b9
When CH1 alert 4 is on
b2
When CH2 alert 4 is on
b10
When CH1 alert 3 is on
b3
When CH2 alert 3 is on
b11
When CH1 alert 2 is on
b4
When CH2 alert 2 is on
b12
When CH1 alert 1 is on
b5
When CH2 alert 1 is on
b13
When CH1 PID control is exercised
b6
When CH2 PID control is exercised
b14
At write data error occurrence (Refer to 8.1)
b7
Unused
b15
Same as the one of the actual RUN LED
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