The Cprtcl Instruction Execution Is Not Completed Although The Rd Led Flashes - Mitsubishi Electric MELSEC iQ-R Series User Manual

The CPRTCL instruction execution is not completed although the
RD LED flashes
Symptom
When the CPRTCL
instruction was executed for
the protocol with the
communication type set to
"Receive Only" or "Send &
Receive", RD LED flashes,
but the instruction execution
is not completed.
27 TROUBLESHOOTING
462
27.3 Troubleshooting by Symptom
Cause Corrective action
Incorrect protocol number is
specified in the control data.
The CD terminal has been
turned OFF when the CD
terminal check is enabled.
The user-edited protocol Check the packet format of the target device, and review the
setting with the Predefined protocol setting.
protocol support function of
Engineering tool is
inconsistent with the packet
format of the target device.
C24 has not received the Check the data transmitted from the target device with the
expected packet. Circuit Trace function of Engineering tool, and correct the
message if it's incorrect.
When proper data are being transmitted from the target
device, take the corrective action by referring to the
troubleshooting below.
C24 has cleared the data
received before the protocol
execution. (On the "Protocol
Detailed Setting" screen of
Engineering tool predefined
protocol support function,
"Clear receive data before
protocol execution" is
designated.)
The C24 data
communications monitoring
time is set to "Unlimited wait",
or the monitoring time is too
long.
■Remarks
In the cases below, errors can be detected by setting the
receive wait time for the "Receive Setting" on the "Protocol
Detailed Setting" screen of Engineering tool predefined
protocol support function.
• Review the protocol number specified in the control data for
the CPRTCL instruction.
• Change the wiring so that the CD terminal remains ON all
the time since a message is skipped if the CD terminal is
OFF when the CD terminal check is set to be enabled.
• In the packet setting, are the element type and element
order incorrect?
• Is each element setting item (Code type, Data length, Data
flow, Calculating range, etc.) incorrect?
• Page 463 ERR LED flashes
• Page 469 Communication is intermittent
• When data may be received before protocol execution,
unselect the checkbox for "Clear OS area (receive data
area) before protocol execution" on the "Protocol Detailed
Setting" screen of Engineering tool predefined protocol
support function.
• Perform cancel processing to complete the CPRTCL
instruction execution.
• Set or shorten the monitoring time and retransmit the
message from the external device and determine the trouble
from the contents of the time-out error.
• When part of a message is skipped.
• When transmission from the target device is interrupted.
MC Non Bi Pd
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