Mitsubishi MELSEC-A Series Reference Manual page 308

10. TROUBLESHOOTING
(3)
(4)
(5)
(6)
Error Number
Displaying loop line status of the host station
(a) Displays the forward loop line (F loop) and reverse loop line (R loop) status of
the host station.
1) OK.........Loop line is normal.
2) NG.........Loop line is faulty.
Displaying loopback execution status
(a) Displays whether loopback has been executed by the host station or not.
1) OK (executed).........Loopback has been executed by the host station.
2) NG (not executed)....Loopback has not been executed by the host station.
Displaying I/O assignment status
(a) Displays whether I/O assignment has been performed by the master station or
not.
1) YES.........I/O assignment has been performed by the master station.
2) NO...........I/O assignment has not been performed by the master station.
Displaying error numbers
(a) Displays error numbers when the following errors occur.
Error Description
A special function module other than 32-point
10
modules is loaded on a remote I/O station.
11 Special function module hardware error.
The number of words read by an RFRP
12 instruction exceeds the link register (W) range
specified with the link parameters.
The number of words to be written by the
13 RTOP instruction exceeds the link register (W)
range specified with the parameters.
The RFRP instruction was executed when a
14
special function module has a hardware failure.
The RTOP instruction was executed when a
15
special function module has a hardware failure.
20 Fuse blown in an I/O module
I/O module verification error (The I/O module
information of the remote I/O station is different
from that recognized at power-up.)
21
(1) An I/O module is not secure.
(2) An I/O module was removed, or another
I/O module was loaded during operation.
Neither inputs (X) nor outputs (Y) have been
22
specified with the parameters.
I/O assignment error in GPP,A7LMS(GPP
23
function)
24 Remote I/O station specification error.
Remove the special function module (any other
than 32-point modules) from the remote I/O
station.
Replace the special function module.
• Change the link register (W) range set with the
link parameters.
• Change the number of words to be read by the
RFRP instruction.
• Change the link register (W) range set with the
parameters.
• Change the number of words to be written by
the RTOP instruction.
• Special function module hardware failure
• Special function module hardware failure
Replace the fuse in the I/O module loaded to the
remote I/O station.
• Check and/or replace the I/O module.
• Reset the master station or the remote
I/O station.
Check the I/O modules ON the remote I/O
station and set the parameters again.
Check the link assignment for the I/O modules
and the master station and correct the I/O
assignment.
Check if local station data are set for a remote
I/O station number with link parameters, and
correct the settings.
10 - 10
Counter Measure