Mitsubishi Q Series User Manual page 233

8 TROUBLESHOOTING
bit Condition on which bit turns on
Unused
b0
When CH2 loop disconnection is detected
b1
When CH2 alert 4 is on
b2
When CH2 alert 3 is on
b3
When CH2 alert 2 is on
b4
When CH2 alert 1 is on
b5
When CH2 PID control is exercised
b6
Unused
b7
8 - 10
(3) H/W Information
(a) Hardware LED information
The hardware LED information gives the following information.
1) Actual LED information
b15
2) LED1 information
b15
bit Condition on which bit turns on
When CH1 loop disconnection is detected
b8
When CH1 alert 4 is on
b9
When CH1 alert 3 is on
b10
When CH1 alert 2 is on
b11
When CH1 alert 1 is on
b12
When CH1 PID control is exercised
b13
At write data error occurrence (Refer to 8.1)
b14
Same as the one of the actual RUN LED
b15
MELSEC-Q
b2
b0
ALM
ERR
RUN
b0
8 - 10