Mitsubishi Electric RD78G4 User Manual page 82

Error Error definition and causes
code
D840H Number of transient requests exceeded
the upper limit of simultaneously
processable requests.
D841H The request data size of memory read/
write command is out of range.
D842H • Routing information to the destination
network No. is not registered.
• In transient transmission, the number of
relays to other networks exceeded
seven.
• The communication path is being
updated.
D843H The module operation mode is set to a
mode in which transient transmission
cannot be executed.
D844H Incorrect frame was received.
• Unsupported pre-conversion protocol
• Unsupported frame type
• Application header variable part
• Application header HDS
• Application header RTP
• Read command not requiring response
D902H The online test data is incorrect.
D903H During execution of the communication
test, the test was retried.
D905H A communication monitoring timeout has
occurred in communication test.
D906H Transmission completion wait timeout has
occurred in communication test.
D909H The header information of transient
transmission is incorrect.
D90AH During execution of the communication
test, the test was retried.
D90BH The number of stations that communicate
in the network is out of the specification
range.
D90CH The communication destination specified
for the communication test is incorrect.
D912H Transient transmission sending failed.
3 TROUBLESHOOTING
80
3.5 List of Error Codes
Action
• Pause the transient transmission temporarily, and retry the operation.
• Lower the transient transmission usage frequency, and retry the operation.
Correct the read or write size specification at the transient request source,
and retry the operation.
• Correct the target network No. at the transient request source, and retry
the operation.
• Correct the communication path from the transient request source to the
destination, and retry the operation.
• When the dynamic routing is not used, or the module of the series other
than MELSEC iQ-R is included, retry the operation after correcting the
routing setting.
• Change the system configuration so that the number of relay stations is
seven or less.
• Transient transmission cannot be performed while the communication path
is being updated. Retry the operation.
After completion of the module communication test, retry the transient
transmission.
Correct the request data at the transient request source, and retry the
operation.
• Correct the data at the station that started the online test, and retry the
operation.
• If the error occurs again even after taking the above, please consult your
local Mitsubishi representative.
After completion of the communication test, retry the operation.
• Check the network status using the CC-Link IE TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action. Then, retry the
operation.
• Check if "Routing Setting" of "CPU Parameter" is correctly set, and take
action.
• Check the network status using the CC-Link IE TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action. Then, retry the
operation.
• Lower the transient transmission usage frequency, and retry the operation.
• Check if "Routing Setting" of "CPU Parameter" is correctly set, and take
action.
Correct the header information at the transient request source, and retry the
operation.
Check the network status using the CC-Link IE TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action. Then, retry the
operation.
• Check the network status using the CC-Link IE TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action.
• If the number of slave stations per network is more than 64, reduce it to 64
or less.
• Correct "Target Station" of communication test, and retry the operation.
• "Communication Test" cannot be executed for own station and relay
sending station. Set "Target Station" to other than own station and relay
transmission station.
• The communication destination is mounted on the same base unit (main
base unit and extension base unit) as the connected station (own station).
Do not execute the communication test for station on the same base unit
(main base unit and extension base unit) as the connected station (own
station).
• Lower the transient transmission usage frequency, and retry the operation.
• Check if the switching hub and the cables are connected properly.
Detailed
information
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