Panasonic FP7 Series User Manual page 125

R0
DF
（ （ ） ）
R100
SEND.US
■
Time chart (in the case of CPU with built-in ET-LAN)
Master communication
clear to send flag
(X90 - X9F)
Master communication
sending flag
(Y90 - Y9F)
Execute SEND
Master communication
sent flag
(Y70 - Y7F)
Sending data
Response reception
processing
■
I/O allocation (in the case of CPU with built-in ET-LAN)
I/O number
Master communication
X90 to X9F
clear to send flag
Master communication
Y90 to Y9F
sending flag
Y70 to Y7F Sent flag
(Note 1) Each contact is used for reading the operation state. Do not write over it with a user program.
■
Precautions during programming (in the case of CPU with built-in ET-LAN)
● Use the UNITSEL instruction immediately before the SEND/RECV instruction to specify a
target connection number for communication.
WUME-FP7COM-07
8.4 MODBUS RTU Master Communication (SEND)
X90 Y90
Master Master
communication communication
clear to send flag sending flag
UNITSEL
DT100 U2
S
Check that
the flag is ON
Check that the
flag is OFF
Name
Turns ON when a connection is established in the master
communication.
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.
Reports completion result of sending data in genera-purpose
communication or master communication. (Normal completion: 0,
Abnormal completion: 1)
execution
U100
S1
U1 DT400
n D1 D2
R100
SEND execution conditions
Clear to send flag: ON
Sending flag: OFF
SEND
Settings for the communication
port
U1
S1: CPU LAN port (U100)
S2
S2: Connection 1 (U1)
SEND processing
DT0
S: Data storage area (DT100)
n: Sent data amount (U2)
D3
D1: Partner unit no. (U1)
D2: Destination address (DT400)
D3: Execution result code (DT0)
SEND instruction executable
conditions
Clear to send flag (X90 - X9F): ON
Sending flag (Y90 - Y9F): OFF
Sending flag (Y90 - Y9F):
While sending: ON
ED instruction executed following
response reception processing: OFF
Sent flag (Y70 - Y7F):
Normal completion: OFF
Abnormal completion: ON
Description
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