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Check code
Check code name
Possible causes
Duplication of central control address
Central control address is duplicated.
[L20]
(New code)
YES
NO
YES
NO
YES
NO
YES
NO
Are U3/U4
communication
cables connected
normally?
When a unit
connected to U3/U4
is in a group, is it set
to header unit?
Check and correct I/U address,
central control address.
Correct cable connection.
Set the connected unit to
header unit.
Check code
Check code name
Possible causes
I/U external interlock
When an external alarm is input
[L30]
(New code)
Is external device
connected to CN80?
Is external device
working normally?
Check possible error
causes.
Check I/U boards.
→ Replace defective board.
Check external device.
→ Replace it if necessary.
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