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Using the Message Service
Section 6-3
6-3
Using the Message Service
With SEND, RECV, and CMND, the Network Instruction Enabled Flag and
Network Instruction Error Flag are generally written into the program as input
conditions, as shown below. Only one instruction can be executed at a time for
any given communications port. Exclusive control thus must be incorporated
to execute two or more instructions per operating level with C200HX/HG/HE
PLCs, nine or more instructions with CS/CJ-series, CVM1, and CV-series
PLCs (because CVM1 and CV-series PLCs have eight ports), or two or more
instructions with CQM1H-series PLCs.
SEND/RECV Flags
CS/CJ-series PLCs
Note
With CS/CJ-series PLCs, ports 0 to 7 are also used for executing the PMCR
(Protocol Macro) instruction, therefore these flags are used for the 4 instruc-
tions, SEND/RECV/CMND/PMCR. When the PMCR command is being exe-
cuted, the same port cannot be used for SEND/RECV/CMND instructions.
KEEP A
Keep instruction
Turns A ON from beginning to completion of
communications instruction.
Reset B
A
Operand and
control data cre-
ation by @MOV
and @XFER
Communications
instruction
@SEND
@RECV
@CMND
Creates operand and control data in a given area.
Executes communications instruction.
Network Instruction
Enabled Flag
A
Startup differ-
ential
DIFU B
Creates reset input. (Turns reset B ON after execution of
communications instruction.)
Network Instruction Error Flag
Network Instruction
Enabled Flag
A
Reset D
In case of Send Error Flag, re-send processing
can be executed.
Establishes exclusive control so that no communications
instruction is started before the previous one has been
completed.
Exclusive control to prevent simultaneous execution:
(Continues in the same way.)
Active Node Flag for
source node
Active Node Flag for
destination node
A
Execution
condition
KEEP C
Keep instruc-
tion
C
Execution
condition
Network Instruction
Enabled Flag
Name
Address
Contents
Word
Bit
Network Instruc-
tion Enabled Flag
A202
Port number corresponds
to bit number, i.e., port 0:
bit 00, port 1: bit 01, etc.
0: Execution not enabled (executing)
1: Execution enabled (not executing)
Network Instruc-
tion Error Flag
A219
Port number corresponds
to bit number plus 8, i.e.,
port 0: bit 08, port 1: bit 09,
etc.
0: Normal end
1: Abnormal end
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...