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Toshiba nv Series
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7.1 If a Trouble is Suspected
Unified Controller nv series type2 light Controller Unit Instruction Manual
69
Input signal check
If the input signal cannot be read normally although the program is running, check the
following:
ON/ OFF
LEDON/ OFF
I/ O
I/ O
I/ O
Y ES
NO
Y ES
Y ES
NO
LED ON / OFF
OF F
DSW - 1, DSW - 2 ON
NO
TC- ne tI/ O I/ O
TC- ne t I/ O
NO
Y ES
Y ES
Figure 7-4 Input signal check procedure
Is LED of input module turned ON and
OFF when external equipment is
powered ON and OFF?
If LED indication is faulty, check the input
voltage generated at ON/OFF time and the
looseness of the terminal block.
Does actual I/O module installed
condition match I/O assignment
information monitored with nV-Tool?
Is I/O status checked on System View?
Is assignment faulty only for specific
input module?
Does this failure occur for all I/O
signals
of I/O unit?
Functionally normal if they match.
Noise may cause an erroneous input.
Check that the input module is mounted.
Also check the failure of the input module
which may cause an error.
By default, all dip switches are OFF. If
DSW-7 or -8 is kept on when power is
turned on, memory is cleared. Before
clearing memory, check that the master
program is backed up with media.
Check cable connections. A failure might
have occurred on a cable or the I/O
interface.

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