Omron CJ - PROGRAMMING MANUAL 12-2009 - Network Instructions

143
Network Instructions
Section 3-23
3-23 Network Instructions
RECEIVE VIA
SERIAL COMMU-
NICATIONS UNIT
RXDU
@RXDU
255
Reads the specified number of bytes of data starting with the specified
first word from the serial port of a Serial Communications Unit with unit
version 1.2 or later. The data is read in no-protocol mode with the start
code and end code (if any) specified in the allocated DM Setup Area.
CHANGE SERIAL
PORT SETUP
STUP
@STUP
237
Changes the communications parameters of a serial port on the CPU
Unit, Serial Communications Unit (CPU Bus Unit), or Serial Communi-
cations Board. STUP(237) thus enables the protocol mode to be
changed during PLC operation.
Output
Required
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution condition
NETWORK SEND
SEND
@SEND
090
Output
Required
NETWORK
RECEIVE
RECV
@RECV
098
Output
Required
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution condition
RXDU(255)
D
C
N
D: 1st destination
word
C: 1st control word
N: Number of bytes
to store
(0000 to 0100 hex)
STUP(237)
C
S
C: Control word
(port)
S: First source
word
SEND(090)
S
D
C
S: 1st source
word
D: 1st destination
word
C: 1st control
word
D
15
0
n
S
15
0
Transmits data to a node in the network.
Local node
Destination node
n: No.
of send
words
RECV(098)
S
D
C
S: 1st source
word
D: 1st destination
word
C: 1st control
word
D
15
0
15
0
S
m
n
Source nodeLocal node
Requests data to be transmitted from a node in the network and
receives the data.