Chapter 6 Led Display; Qj51Aw12D2 - Mitsubishi Electric MELSEC-Q Series User Manual

CHAPTER 6
6.1

QJ51AW12D2

Name Color
LINK
SET
ALM
M ERR.
For details on the display when M ERR. is on, see the table below.
No.
M ERR.
●
1
●
2
●
3
●
4
●
5
6 ●
7 ●
*1 These LEDs turn on, turn off, or flash according to the operating status.
No.1 to 4 are checked only at the time of the reset.
Transmission is performed only when an EEPROM error occurs.
50
LED DISPLAY
Flashing
Green
Off
On
Green Flashing
Off
On
Slow flashing (one-
second intervals)
Red
Fast flashing (0.2-
second intervals)
Off
On
Red
Off
On/Off status
ALM LINK
● ●
● ●
*1 *1
 
 ●
 

●
Meaning
Module operating status
Module failure
Automatic address detection in progress
Address write in progress
Before or after automatic address detection
D/G disconnection, no response from the slave module
D/G short circuit, D/24V short circuit
24VDC is not being supplied, or the voltage is low
Operating normally
Turns on when an error occurs in the QJ51AW12D2 or the programmable
controller. In this case, all functions are stopped.
The error LED for the applicable CPU flashes. (Excluding EEPROM errors)
Module normal
SET
●
Internal ROM error

Internal RAM error
●
EEPROM error

Module initialization error

Watchdog timer error
● Programmable controller CPU error (ITWDT)
● Software error (IORSTL)
Main Causes
●:On, :Off