Panasonic FP7 Series Command Reference Manual

● After it is confirmed that connection 1 is established in master mode (X90) and no
transmissions are currently being executed for the same port (Y90), the RECV instruction is
started.
● The UNITSEL instruction is used to specify a slot number (LAN port: U100) and the
connection number (U1).
● In the RECV instruction, specify and execute the type of MODBUS command and partner
station number (H0301), starting address (H0), data amount (U2), and PLC's starting
address to store the data (DT100). Check addresses of connected devices in the instruction
manuals of devices.
R0
Master
communication
clear to send flag
R100
UNITSEL U100 U1
RECV.US DT0U2 DT100H301 H0
X90 Y90
Master
communication
sending flag
R100
RECV
execution
Settings for the communication
port
S1: CPU LAN port (U100)
S2: Connection 1 (U1)
RECV execution start conditions
Clear to send flag: ON
Sending flag: OFF
RECV instruction execution
S1: MODBUS command (H03)
Partner station no. (H01)
S2: Data address (H0)
n: Data amount (U2)
D1: Data storage area (DT100)
D2: Execution result code (DT0)
（（ ））
DF
S1 S2
S1 S2 n D1 D2
■
Time chart (in the case of CPU with built-in ET-LAN)
Execute RECV
Master communication
sending flag
(Y90 - Y9F)
Master communication
sent flag
(Y70 - Y7F)
Sending data
Response reception
processing
Master communication
clear to send flag
(X90 - X9F)
Check that the
flag is ON
RECV instruction executable
conditions
Clear to send flag (X90 - X9F): ON
Sending flag (Y90 - Y9F): OFF
Sent flag (Y70 - Y7F):
Normal completion: OFF
Abnormal completion: ON
Sending flag (Y90 - Y9F):
While sending: ON
ED instruction executed following
response reception processing: OFF
Check that the
flag is OFF
■
I/O allocation (in the case of CPU with built-in ET-LAN)
I/O number Name Description
X90 to X9F
Master communication
clear to send flag
Turns ON when a connection is established in the master
communication.
Y90 to Y9F
Master communication
sending flag
Turns ON during sending data based on the SEND/RECV
instruction.
Turns OFF when the ED instruction is executed after the
completion of the response receive processing.
15.7 RECV (MODBUS Master: Function Code Specification)
WUME-FP7CPUPGR-12 15-49

Panasonic FP7 Series Specifications

General

Brand	Panasonic
Model	FP7 Series
Category	Controller
Language	English