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5-3SectionUsing Protocol Macros
69
e) Transferring the created project to the Board:
See 11.1 Transferring and Reading Protocol Data between Personal
Computers and Serial Communications Boards.
3. Create the ladder program.
a) Setting Send Data
• Specifying Operands
Set the send data in the I/O memory after the S+1 operand of the
PMCR(––) instruction. Set the number of send data words (including S
itself) in S.
• Direct Designations
Set the send data in the I/O memory specified by the read variables in the
send message.
• Specifying Link Words
Set the send data in the O1 or O2 area of the Link Word Area.
b) Coding PMCR(––)
First word of send data
First storage word for receive data
1: Use port 1, 600: Sequence No. 100
Protocol Macro
Executing Flag
PMCR
#1100
DM0000
DM1000
Input condition
If the input condition turns ON when the Protocol Macro Executing Flag
(IR 20708 for port 1) is OFF, communications sequence No. 100 registered
in the Serial Communications Board is called, and data is sent and received
via port 1 of the Serial Communications Board.
The amount of send data depends on the number of words specified in
DM 0000 (the number of words after DM 0001 plus 1 for DM 0000 itself),
and is sent from the next word after DM 0001.
Number of words
Number of send words plus 1 for DM 0000
Send data
Number of words
S: DM 0000
The receive data is stored in consecutive words beginning with DM 1000,
and the number of words actually stored in DM 1000 (the number of words
after DM 1001 plus 1 for DM 1000 itself) is stored.
Receive data
Number of words
Number of receive words plus 1 for DM 1000
Number of words
D: DM 1000
DM 1001
c) Execute PMCR(––)
4. For details on the confirming operation, see Section 12 Tracing and I/O
Memory Monitoring.
• Transmission Line Tracing
The data in the send/receive messages flowing over the transmission line
(RS-232C or RS-422A/485) and the control codes are traced.
• I/O Memory Monitoring
Monitors send/receive data and the status of the various flags.