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1032
Network Instructions
Section 3-25
The following diagram shows an example of exclusive control.
Automatic Allocation of
Communications Ports
■
Overview
The following instructions all use one communications port (logical port)
between ports 0 to 7.
• Network Communications Instructions: SEND(090), RECV(098), and
CMND(490)
• Serial Communications Instructions: PMCR(260), TXDU(256), and
RXDU(255)
In this section, all of the above instructions are referred to as Communications
Instructions.
Each communications port can be used by only one instruction at a time. The
following steps were previously necessary to use the communications ports.
• When programming, it was necessary to keep track of the communica-
tions ports that were being used to designate them in operands.
• In the ladder program, it was necessary to confirm the availability of com-
munications ports before using them.
KEEP A
DIFU B
KEEP C
Reset B
Reset D
Execution
condition
Communications
Port Enabled Flag
Local Node
Active Flag
Destination
Node Active
Flag
Creates op-
erand or
control data
with @MOV
or @XFER.
@SEND,
@RECEIVE,
@CMND
Communications
Port Enabled Flag
Communications
Port Error Flag
Execution
condition
Communications
Port Enabled Flag
Same as above.
Bit A remains ON while the communications
instruction is being executed.
Copies the operand and control data to the
desired data area.
Executes the communications instruction.
Writes the reset input. (Reset B is turned
ON when the communications instruction
is completed.)
For Transmission Error Flag display
(Good if data is retransmitted.)
Exclusive control to prevent simulta-
neous execution:
Exclusive control prevents another
communications instruction from being
executed until the instruction above is
completed.
Summary of Contents for SYSMAC CS Series
Page 2: ......
Page 4: ...iv ...
Page 30: ...xxx ...
Page 186: ...146 List of Instructions by Function Code Section 2 4 ...
Page 1320: ...1280 Model Conversion Instructions Unit Ver 3 0 or Later Section 3 35 ...
Page 1390: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...
Page 1391: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits ...
Page 1392: ...1352 ASCII Code Table Appendix A ...
Page 1404: ...1364 Revision History ...