Melsec-St System Checkup - Mitsubishi MELESEC-ST User Manual

12 TROUBLESHOOTING

12.1.1 MELSEC-ST system checkup

Before starting slice module troubleshooting, check the description below.
(1) Check that a proper number of slice modules are mounted.
(2) Check that the total number of occupied I/O points is within the
(3) Check that slice modules are mounted on base modules
(4) Check the combination of slice modules and base modules.
(5) Check that the total slot width of slice modules is within 85cm.
(6) Check that the total 5VDC internal current consumption and total
(7) Check the error in the master station.
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Check whether 63 or less slice modules are used with the head module.
When intelligent function modules are mounted, check whether the number of the
intelligent function modules is 26 or less.
If the range is exceeded, the RUN LEDs of invalid slice modules are off.
range of specifications.
Check whether the total number of occupied I/O points of the modules
comprising the MELSEC-ST system is within the range shown below.
*1
CC-Link: 252 points
PROFIBUS-DP: 256 points
If the range is exceeded, the RUN LEDs of invalid slice modules are off.
Refer to the head module manual for details.
1: The available points will decrease by two points for each additional power
distribution module.
Before switching on the external power supplies of the MELSEC-ST system,
check whether slice modules are mounted on all base modules.
Check whether the slice modules are mounted on the applicable base modules.
Module type
Power distribution module
I/O module
Intelligent function module
Check whether the total slot width of the slice modules (without the head module)
comprising the MELSEC-ST system is within 85cm.
Refer to Chapter 3 for details.
24VDC current are within the capacity of the power distribution
modules.
Calculate the total 5VDC internal current consumption and total 24VDC current,
and check whether they are within the capacity of the power distribution modules.
Refer to Section 5.2.1 for the calculation of 5VDC internal current consumption
and 24VDC current.
When an error occurs in master station, check the error to fix.
MELSEC-ST
Reference section
Chapter 5
Chapter 7
Refer to intelligent function module manual.
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