Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
11 TROUBLESHOOTING
11.3.6 The CPRTCL instruction execution is not completed although the "RD" LED blinked.
Symptom Cause Corrective action
MC
B
idi
rec
tional
Non
proc
edure
P
re-def
ined
• Incorrect protocol No. is
specified in the control
data.
• Check the protocol No. specified in the control data for the
CPRTCL instruction for an error.
• The CD terminal is OFF
when "CD terminal check
enabled" is set.
• 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.
• The user-edited protocol
setting in GX
Configurator-SC (Pre-
defined protocol support
function) is inconsistent
with the packet format of
the external device.
• 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.)
• The Q series C24 has not
received the expected
packet.
• Using the circuit trace (the communication data monitoring
function) of GX Configurator-SC (Pre-defined protocol
support function), 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 11.3.12 or
11.3.13.
• The Q series C24 has
cleared the data received
before the protocol
execution. (In "Protocol
detailed setting" of GX
Configurator-SC (Pre-
defined protocol support
function), "Clear OS area
(receive data area) before
protocol execution" is
enabled.)
• If data could be received before protocol execution,
disable the "Clear OS area (receive data area) before
protocol execution" setting in "Protocol detailed setting" of
GX Configurator-SC.
• When the CPRTCL
instruction was
executed for the
protocol with
Communication type
set to "Receive only"
or "Send and
receive", "RD"
blinked, but the
instruction execution
was not completed.
• The Q series C24 data
communications
monitoring time is set to
"Infinite wait", or the
monitoring time is too
long.
• 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.