Mitsubishi Electric Melsec WS Series, User Manual

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Procedures before operation
MELSEC-WS
118
(2) Sample program
This manual describes only devices used in sample programs and details of the
processing.
For the acquisition of sample programs, please contact your local Mitsubishi
representative.
1) Device assignment
The following tables list devices used in the sample program.
Table 43: Devices used in the sample program
W device
W0 to W18 Input data set 1 storage area
W20 to W2F Input data set 2 storage area
W30 to W4D Input data set 3 storage area
M device D device
M500 Receive execution D2 SOCRCV instruction failure error code
M501 SOCRCV instruction success device D500 and D501 SOCRCV instruction control data
M502 SOCRCV instruction failure device D520 Response command check device
M510 SOCRCV instruction normal completion D900 to D976 SOCRCV instruction receive data area
M511 SOCRCV instruction abnormal completion - -
M520 Response command verification normal
completion - -
M521 Data size error device - -
C device
*1
C20 SOCRCV instruction Number of executions
C21 Number of successes
C22 Number of failures
C31 Verification check Number of successes
C32 Number of failures
*1 C device is used to check the operation of the communication program.

If the Built-in Ethernet port QCPU stops during communications in auto update
mode, the SOCRCV instruction will not be executed even when data are
transmitted from the WS0-GETH. This may cause the receive buffer of the Built-
in Ethernet port QCPU to overflow and data transmission of the WS0-GETH to
stop.

If the scan time of the Built-in Ethernet port QCPU is longer than the
transmission interval of the WS0-GETH, update of received data delays. For this
reason, configure the auto update interval much longer than the scan time.
Note