Toshiba T2N - Manual (Page 96)

6.Troubleshooting
User’s manual 81
When there is a problem with the actual operation of output equipment although
correctly outputting to registers and devices on the program, carry out the
following in preparation for checks.
(1) Save the program. (In a floppy disk, EEPROM, etc)
(2) Clear the CPU memory.
(3) Put the ROM/RAM shift switch to RAM (ON).
After making the above preparations, carry out checks in the following
sequence.
A fuse
has blown
The problem lies in the output
element.
Replace the module.
Apply power and operate
automatic I/O allocation.
A problem with the unit, CPU, I/O
module expansion cables can be
suspected. (See the paragraph on
input checks) Does the I/O allocation
information agree with the
module mounting state? NO
Write the END command
only and turn to RUN.
Does the output module
LED go ON/OFF when the
output from the data
setting of the programmer
is ON/OFF?
NO
The problem lies in the output
module.
Replace the module.
Is the external power
supply voltage of the
output module normal?
Adjust the external power supply
voltage to the
specified voltages
of the respective output modules.
Abnormal
Normal
YES
Has a fuse blown?
(When there is no fuse,
proceed as if fuse not
blown)
Note: After eliminating the cause
of the blown fuse, replace the
fuse.
Fuse not
blown.
YES
6.6
Output Check
When a fuse blows, always investigate and eliminate the cause. If the fuse
is replaced without eliminating the cause and the power supply is switched
ON again, there is a risk of progressive damage to the module. When the
cause of the blown fuse cannot be determined, consult Toshiba without
replacing the fuse.
NOTE