Mitsubishi Electric MELSEC iQ-R Series User Manual page 198

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.
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
D850H Startup of the Motion module is in
progress, and the communication failed.
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.
D90DH An error was detected in the network
module.
4 TROUBLESHOOTING
196
4.5 List of Error Codes
Action
• Execute the instruction again after pausing the transient transmission
temporarily.
• Execute the instruction again after lower the transient transmission usage
frequency.
Execute the instruction again after correcting the read or write size
specification at the transient request source.
• Execute the instruction again after correcting the target network No. at the
transient request source.
• Execute the instruction again after correcting the communication path from
the transient request source to the destination.
• 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.
Execute the instruction again after correcting the request data at the
transient request source.
Retry the operation after a while.
• 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.
• Execute the instruction again after lower the transient transmission usage
frequency.
• Check if "Routing Setting" of "CPU Parameter" is correctly set, and take
action.
Execute the instruction again after correcting the header information at the
transient request source.
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 device stations per network exceeds 120, reduce it to 120
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 target station 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).
Please consult your local Mitsubishi representative.
Detailed
information 1
Detailed
information 2
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