Troubleshooting; Melsec-St System Troubleshooting - Mitsubishi MELESEC-ST User Manual

12 TROUBLESHOOTING

12 TROUBLESHOOTING
12

12.1 MELSEC-ST System Troubleshooting

Check whether the MELSEC-ST system is configured correctly.
Check whether the external power supplies of all power distribution
modules are on.
(Check whether the SYS. LEDs and AUX. LEDs of the power
distribution modules are on.)
The RUN LED of the head module is off.
There is a slice module whose RUN LED is off.
Communication stopped between the master station and head
module.
The ERR. LED of the head module is on or flickering.
There is a slice module whose RUN LED is flickering (1s interval).
There is a slice module whose ERR. LED is on or flickering.
12 - 1
This chapter explains the troubleshooting of the MELSEC-ST system, I/O modules and
power distribution modules.
Refer to the manuals of the corresponding modules for the troubleshooting of the head
module and intelligent function modules.
The troubleshooting of the whole MELSEC-ST system is shown below.
Error
MELSEC-ST
Refer to Section 12.1.1.
Check whether:
The external power supplies are wired correctly.
24VDC power is supplied from the external power
supplies.
Refer to the head module manual.
Refer to Section 12.1.2.
Refer to the head module manual.
Refer to the head module manual.
Refer to Section 12.1.3.
Power distribution module
Refer to Section 12.2.2.
I/O module
Refer to Section 12.3.2.
Intelligent function module
Refer to the intelligent function module manual.
12 - 1