6.Troubleshooting
80 PROSEC T2N
When unable to read the input signal correctly although the program is being
executed, check the following items.
Is the problem only the
allocation of a certain input
module?
Check the installation of input
modules. A problem with input
module can also be suspected.
Is there an allocation
problem with all
the
I/O on
the expansion units?
Check the connections of the
expansion cables and unit number
settings. A problem with the
expansion cables or the expansion
units can be suspected.
Is there an allocation
problem with all the I/O on
the basic unit?
NO
NO
NO
YES
YES
YES
The problem lies in the CPU module
or the rack.
Does the actual I/O module
mounting state agree with
the input/output allocation
information monitored by
the programmer?
Does the LED on the input
module go ON/OFF when
external equipment is
switched ON/OFF?
When there is a problem with the
state of the LED, check the input
voltage when ON/OFF and check
the terminal block for slack.
When it agrees, it is functionally
normal. Error input due to noise is
suspected.
Try executing Automatic
I/O allocation.
Was the allocation
normal?
YES
NO
Normal
YES
YES
NO
NO
6.5
Input Check
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