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MELSEC-Q
9 DEDICATED INSTRUCTIONS
9.1 Precautions
(1) Before executing Data consistency dedicated instruction
Before executing Data consistency dedicated instruction, check the following
items.
(a) Compatible
module
versions
Use the modules with the following serial numbers.
• The QJ71DN91 with the first five digits of the serial number is "13042" or
later
• The QCPU with the first five digits of the serial number is "02092" or later
(b) Setting of Data consistency dedicated instruction setting area
Enable the corresponding bit of Data consistency dedicated instruction
setting area (address: 0633
H
). (Refer to Section 3.4.16.)
POINT
When the corresponding bit of Data consistency dedicated instruction setting area
(address: 0633
H
) is disabled, Data consistency dedicated instruction cannot be
executed, and no error occurs.
(c) Data transfer between devices while Data consistency dedicated instruction
is executed
When using Data consistency dedicated instruction, do not use the
following methods for data transfer between devices.
Doing so may result in data inconsistency.
• Auto refresh
• MOV instruction
• FROM/TO instruction
(2) Transmission delay time when Data consistency dedicated
instruction is used
When Data consistency dedicated instruction is used, transmission delay time
becomes longer. (Refer to Section 3.5.3.)
(3) Execution timing of Data consistency dedicated instruction
After enabling the corresponding bit of Data consistency dedicated instruction
setting area (address: 0633
H
), execute Data consistency dedicated instruction
once per sequence scan.
(4) Operation when Data consistency dedicated instruction is not
executed
After enabling the corresponding bit of Data consistency dedicated instruction
setting area (address: 0633
H
), if the dedicated instruction is not executed in three
sequence scans, an error occurs.
• When using the master function
Error Set Signal for Master Function (X03) turns ON and the error code is stored
in Error Information for Master Function (address: 01B1
H
).
• When using the slave function
Error Set Signal for Slave Function (X08) turns ON and the error code is stored
in Error Information for Slave Function (address: 0601
H
).
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Summary of Contents for QJ71DN91
Page 1: ...DeviceNet Master Slave Module User s Manual QJ71DN91 GX Configurator DN SW1D5C QDNU E ...
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