The Cprtcl Instruction Execution Is Not Completed Although The "Rd" Led Blinked - Mitsubishi Melsec-L Series User Manual

15.3.6 The CPRTCL instruction execution is not completed although the "RD" LED blinked

Symptom
• Incorrect protocol No. is
specified in the control
data.
• The CD terminal is OFF
when "CD terminal check
enabled" is set.
• The user-edited protocol
setting in the predefined
protocol support function
of GX Works2 is
inconsistent with the
packet format of the
external device.
• When the CPRTCL
instruction was
executed for the
• The C24 has not received
protocol with
the expected packet.
Communication type
set to "Receive Only"
or "Send and
• The C24 has cleared the
Receive", "RD"
data received before the
blinked, but the
protocol execution. (In the
instruction execution
"Protocol Detailed
was not completed.
Setting" screen of GX
Works2 predefined
protocol support function,
"Clear OS area (receive
data area) before protocol
execution" is enabled.)
• The C24 data
communications
monitoring time is set to
"Infinite Wait", or the
monitoring time is too
long.
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Cause
• Check the protocol No. specified in the control data for the
CPRTCL instruction for an error.
• If the CD terminal is OFF with "CD terminal check
enabled" set, messages will not be read. Change the
wiring so that the terminal status is always ON.
• Check the packet format of the external device, and
correct the protocol setting.
(1) Check for an error in the element type or element order
in the packet setting.
(2) Check for an error in each element setting item (Code
type, Data length, Data flow, Calculating range, etc.)
• Using the circuit trace of the predefined protocol support
function of GX Works2, check for the data being
transmitted from the external device.
• When proper data are being transmitted from the external
device, take action according to Section 15.3.12 or
15.3.13.
• If data could be received before protocol execution,
disable the "Clear OS area (receive data area) before
protocol execution" setting in the "Protocol Detailed
Setting" screen of GX Works2 predefined protocol support
function.
• Set monitoring time or shorten the specified time, and
then transmit data from the external device to find a cause
from the timeout error.
• Part of the messages is not read.
• Transmission from the external device is interrupted.
• Perform cancel processing to complete the CPRTCL
instruction execution.
Corrective action
15 TROUBLESHOOTING
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