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10
DEDICATED INSTRUCTIONS
10 DEDICATED INSTRUCTIONS
10.1 Dedicated Instruction List and Available Devices
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The dedicated instructions make programming easy for use of the intelligent function
module functions.
(1) Dedicated instruction list
The following table indicates a list of dedicated instructions supported by the
QJ71MT91.
Dedicated
Instruction
Reads and writes the MODBUS device data from and to the
MBRW
slave.
Communicates with the slave in the request message
MBREQ
format of any PDU (protocol data unit).
Interlock for dedicated instruction execution
Execute the dedicated instruction with the I/O signals in the following status.
X0
X3
POINT
Until completion of the dedicated instruction execution, do not change the data
(such as control data, argument) specified for the dedicated instruction.
(2) Available devices
The following devices are available for the dedicated instructions:
1
Bit
X, Y, M, L, F, V, B
1: Word device bit designation can be used as bit data.
Word device bit designation is done by designating Word device . Bit No. .
(Designation of bit numbers is done in hexadecimal.)
For example, bit 10 of D0 is designated as D0.A .
However, there can be no bit designation for timers (T), retentive timers (ST) and
counters (C).
Description
Dedicated
instruction
Internal devices
Word
T, ST, C, D, W
MELSEC-Q
Reference
Section 10.2
Section 10.3
X0 :
Module READY
X3 :
Basic parameter setting
existence
File register
R, ZR
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