Mitsubishi Electric MELSEC iQ-R Series User Manual page 279

Symptom
The reception notification trigger
does not switch ON even when
receiving an SECS message.
Communication erroneously stops
during SECS communication.
The sending and receiving of SECS
messages are delayed.
An SECS message is sent twice
erroneously by a single sending
request.
Check item
Has an S9 related error occurred?
The transaction created with the
settings tool does not match the list
structure of the receiving message.
Is the Mode switch of the MELSEC-Q
series SECS/GEM communication
software pre-installed model module
set to RUN?
Are there incorrect device
assignment settings in SECS/GEM
communication software?
Has a line disconnection request
been received from the
Programmable Controller CPU?
Has a line disconnection request
been received from the
correspondence destination?
Check for physical problems with the
LAN cable.
Are IP addresses conflicting?
Is CIM Control READY OFF?
Are the cache settings of the referent
device set?
Is the trigger hold time of the sending
request trigger inappropriate?
Is "Shared Memory Synch Waiting
Timer" setting inappropriate?
Corrective action
Check whether an S9 related error has occurred in the SECS communication
log.
If an error has occurred, remove the cause of the error.
For the log reference method, refer to the following:
Page 154 Log Output
When the message received from the correspondence destination is different
from the list structure, item type, and data length of the transaction created
with the setting tool, an S9 related error message is sent, and the
corresponding reception notification trigger is not switched ON.
Review the structure of the transaction.
For the transaction creation method, refer to the following:
Page 59 Transaction List
If the Mode switch of the MELSEC-Q series SECS/GEM communication
software pre-installed model module set to "STOP", device control to the
programmable controller CPU is not possible.
When SECS/GEM communication is used, always set the switch to "RUN".
Define all device assignment settings for devices used by SECS/GEM
communication software.
If devices not defined by the device assignment settings are configured by
various functions, access is not authorized.
For details on device assignment settings, refer to the following:
Page 78 Device Assignment
When the MELSEC-Q series SECS/GEM communication software pre-
installed model module will be used, the multi-CPU settings of the
programmable controller CPU unit and MELSEC-Q series SECS/GEM
communication software pre-installed model module must also be defined in
the range settings of shared memory. For the multi-CPU settings, refer to the
manual of each module.
Check the PLC log and check whether a line disconnection request has been
received.
If an unintentional request has been received, remove the cause.
Check the SECS log, and then check whether a line disconnection request
has been received.
If an unintentional request has been received, remove the cause.
Check whether the LAN cable has been unplugged or disconnected.
If the IP address of the C Controller module is conflicting, the line may be
disconnected.
If the IP address was conflicting, remove the cause.
If the CIM Control READY is set to off in the program of the Programmable
Controller CPU, SECS/GEM communication software no longer operates.
Do not operate by the program of the Programmable Controller CPU.
When a device defined in the CA-SECS device assignment (I/O assignment)
of device assignment settings is configured as the data referent of the
transaction item, the speed performance can be improved by setting the
cache settings of the corresponding transaction.
For the transaction cache settings, refer to the following:
Page 63 Cache settings
The detection time of the sending request trigger can be adjusted by the
settings of the trigger hold time. Configure an appropriate time.
For the settings of the trigger hold time, refer to the following:
Page 65 Message information
SECS/GEM communication software performs a synchronization check to
confirm the handshake with the Programmable Controller CPU.
By default, the "Shared Memory Synch. Waiting Timer" is configured to 10 ms.
Adjust the shared memory synch. waiting timer according to the scan time of
the programmable controller CPU.
For the settings of the Shared Memory Synch. Waiting Timer, refer to the
following:
Page 94 Control detail
10.1 Troubleshooting by Symptom
10 TROUBLESHOOTING
277
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