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8 MAINTENANCE AND INSPECTION
8.1 Daily Inspection
8
MAINTENANCE AND INSPECTION
To keep using the PLC in the optimal condition, perform the following inspections daily or periodically.
8.1
Daily Inspection
Perform the following inspections on a daily basis.
8.2
Periodic Inspection
Perform the following inspections once or twice every 6 months to a year.
Also perform the inspections when facilities have been relocated or modified or when wiring has been changed.
*1 The operating ambient temperature is 0 to 55
for products manufactured in June 2016 or earlier.
The product life of relay contacts varies considerably depending on the load type used. Note that loads
generating reverse electromotive force or rush current may cause poor contact or welding of contacts which
may lead to considerable reduction of the contact product life.
Page 121 Product life of relay output contacts
Item
Inspection item
Description
1
Installation status
of the module
Looseness of mounting screws
Retighten the mounting screws.
Mounting status of the module
The module should be securely mounted.
Looseness of cover
The cover should not be off.
2
Connection status
Looseness of terminal screws
Retighten the terminal screws.
Proximity of crimp terminals
Check the proximity between crimp terminals and correct the clearance.
Looseness of connectors
Connect cable connectors securely.
3
LED status
Check that the LED status is normal.
User's manuals for each module
Item
Inspection item
Description
1
Ambient
environment
Operating ambient temperature
The temperature in the panel should be -20 to 55
Operating ambient humidity
The humidity in the panel should be 5 to 95%RH.
Working atmosphere
Free from corrosive or flammable gas and excessive conductive dust
2
Power supply voltage
Voltage within the specified range should be supplied.
3
Installation status
Looseness, rattling
Retighten mounting screws.
Dirt, foreign matter
Wipe away any dirt or foreign matter. Clean the module.
4
Connection status
Looseness of terminal screws
Retighten the terminal screws.
Proximity of crimp terminals
Check the proximity between crimp terminals and correct the clearance.
Looseness of connectors
Connect cable connectors securely.
5
Battery
BAT LED
The BAT LED should be turned off.
If flashing, replace the battery with new one.
Period following the battery
purchase
Replace the battery with new one if 5 years or more have passed since the battery was
purchased.
OFF status of SM51 (SM8005),
SM52 (SM8006)
SM51 (SM8005) and SM52 (SM8006) should be off.
If SM51 (SM8005) and SM52 (SM8006) are on, replace the battery with new one.
6
Module Diagnostics (CPU Diagnostics)
The normal status of the system should be checked with the Module Diagnostics (CPU
Diagnostics).
Page 161 Module diagnostics (CPU Diagnostics)
7
Relay contacts
Check the product life of relay outputs.
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