Toshiba T2N - Manual (Page 95)

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