Comparison Of Dedicated Instructions - Mitsubishi Electric MELSEC-A Series Manual

4
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)

4.6.2 Comparison of dedicated instructions

(1) A/AnSCPU
Instruction name
ZNRD instruction
ZNWR instruction
LRDP instruction
LWTP instruction
(2) QnA/QnASCPU
Instruction name
SEND instruction
RECV instruction
READ instruction, SREAD
instruction
WRITE instruction, SWRITE
instruction
REQ instruction
ZNRD instruction
ZNWR instruction
UFSET instruction
UFRST instruction
UFOUT instruction
4
- 21
Description
A/AnSCPU
MELSECNET/10 module
Reads the device data of other station.
Writes data to the device of other station.
Reads the device data of
other station only by station
number designation.
Writes data to the device of
other station only by station
number designation.
Description
QnA/QnASCPU
MELSECNET/10 module
Sends data to target station.
Reads data sent by SEND instruction to device of CPU
module.
Reads the device data of other station.
Writes data to the device of other station.
Issues "remote RUN" and "clock data read/write" requests
to other stations.
Reads the device data of other station.
Writes data to the device of other station.
Turns user-flag which is
corresponding to the host on.
Turns user-flag which is
corresponding to the host off.
Turns user-flag which is
corresponding to the host on/
off.
: Compatible, : Partial change required, ×: Incompatible
QCPU Compat-
MELSECNET/H module ibility
(MELSECNET/10 mode)
-
-
: Compatible, : Partial change required, ×: Incompatible
QCPU Compat-
MELSECNET/H module ibility
(MELSECNET/10 mode)
-
-
-
Precautions for
replacement
Instruction format differs.
Change the sequence
program.
Instruction format differs.
Change the sequence
program.
LRDP instruction cannot
be used. Change them to
ZNRD or READ
instruction.
LWTP instruction cannot
be used. Change them to
ZNWR or WRITE
instruction.
Precautions for
replacement
Change to a sequence
program that uses the link
relay and link register.
Change to a sequence
program that uses the link
relay and link register.
Change to a sequence
program that uses the link
relay and link register.