Total Solution for Industrial Automation
26
CH 6. Maintenance work and Repair
6
Maintenance work and repair
It is recommended to have the PLC checked and diagnosed regularly to maintain its
ideal performance. The following describes what is to be done in a maintenance
work.
6.1
Maintenance work
Daily checkup
There are two items that should be checked daily.
(1)
LED status of module
LED of module
Item to check
Output module
Lighting when output On, lights out when output Off (Problems on
besides states)
(2)
Link status of cable
Check if the screws are tightly attached to the terminal of I/O modules.
Maintenance
There are items that should be checked once for twice every six months or a year.
Also, it is required to do a maintenance work if there is a relocation of devices or
shifts in wiring.
(1)
General standard items
Item
Item to check
Operating temperature
-10 ~ 55℃ (14 ~ 131℉)
Operating humidity
5 ~ 95% RH
Ambient conditions
Avoid corrosive gases and dusts
(2)
Power supply voltage checkup
Check if the standard has conformity by measuring DC input voltage (DC 10~26V).
(3)
Installation status of module
Check if the module is solidly mounted and debris-free.