Mewtocol-Com Master Communication (Recv); Read Data From An External Device - Panasonic AFP7CPS4E User Manual

MEWTOCOL
Master/Slave Communication

7.3 MEWTOCOL-COM Master Communication (RECV)

7.3.1 Read Data from an External Device

 Instructions
In master communication, PLC has the sending right, and executes communication by
sending commands to devices that support MEWTOCOL, and receiving responses.
Messages in accordance with the protocol are automatically generated by PLC. In the user
program, reading and writing can be done simply by specifying the station no. and memory
address and executing SEND/RECV instructions.
PLC
DT100 100
DT101 0
・・・・・・ ・・・・・・・・
・・・・・・ ・・・・・・・・
 Sample program
 Send commands from the COM1 port of the CPU unit, read data from the data area of an
external device (station no. 1) DT400 - DT401, and write the content into PLC's data register
DT100 - DT101.
 Confirm that the unit is in the master mode (XC), and that the sending process is not in
progress for the same port (YC), and start up the SEND instruction.
 In the UNITSEL instruction, specify the slot No. (U0) and the COM. port No. (U1).
 In the RECV instruction, specify and execute the partner station no. (U1), initial address
(DT400), No. of data (U2), and initial address on the PLC side to save data (DT100).
R0
（ ）
DF
Master
communication
Clear to send flag
R100
RECV.US
(Note) The unit number and COM port number in the above program is applied when the COM.1 port of the CPU unit
is used.
7-4
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Command message
%01#RD0040000401 (BCC) C
%01$RD64000000 (BCC) C
Response message
Specify and read station no. and address based on RECV instruction
XC YC
Master
communication
Sending active flag
UNITSEL
U1 DT400
S1 S2
R
R
R100
Execute
RECV
U0 U1
S1 S2
U2 DT100 DT0
n D1 D2
External device supporting
MEWTOCOL-COM
DT00400 100
DT00401 0
・・・・・・ ・・・・・・・・
・・・・・・ ・・・・・・・・
Starting conditions for RECV
execution
Clear to send flag: ON
Sending active flag: OFF
Settings for communication port
S1: Slot 0
S2: COM1
RECV processing
S1: Partner station no. (U1)
S2: Data address (DT400)
n: No. of data (U2)
D1: Data saving area (DT100)
D2: Execution result code (DT0)