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MELSEC-Q
9 DEDICATED INSTRUCTIONS
Error
(1) When a dedicated instruction is completed abnormally, the abnormal completion
signal (D2)+1, turns on and the error code is stored in the transmission result
(S1)+1.
In case of operation errors, the error flag (SM0) turns on and the error code is
stored in SD0.
See one of the following manuals according to the error code, and check and
correct the error.
<Error code>
4FFF
H
or less : QCPU(Q Mode) User's Manual
(Hardware Design, Maintenance and Inspection)
7000
H
or more: Section 10.2 of the User's Manual (Basic)
Program example
The following example shows a program that stores data received via the non-
procedure protocol in D10 and later.
When the input/output signals of the Q series C24 are from X/Y00 to X/Y1F:
Clear the reception result and receive data count
storage device to 0.
Designate the allowable receive data count.
With normal completion, the receive data within the
allowable receive data count (user designated) is read
from the receive data storage area in the buffer memory.
Once the INPUT instruction is executed, the user
designated read completion signal (M0) turns ON for
1 scan.
The reading of receive data and switching of the
ON/OFF status are performed by the PLC CPU.
•
•
The abnormal completion flag is reset by an external
command.
Designate the receive channel.