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4-5
4 Using Protocol Macros
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
4-1
Over
vie
w
of t
h
e Pr
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to
c
ol Mac
ro F
unc
tion
4
4-1-3 Protoco
l Str
ucture
Depending on the response received, this function can either choose to resend the same send mes-
sage (retry processing), or to perform the next process (for example, read the process value for a Tem-
perature Controller with a different address).
*1 You can use the Send, Recv, Send&Recv, Wait, Flush (reception buffer clear), Open (ER-ON), or Close (ER-
OFF) command.
*2 Three types of reception matrix are available to switch the processing, depending on whether the messages
are send messages, receive (wait) messages, or multiple receive (wait) messages. Unlike sequences, these
matrixes are managed as lists.
z
Sequence Parameters
Parameter Meaning
Transmission control parame-
ters Control methods, such as flow control
Link words Settings for words shared between the PLC and the
Serial Communications Unit
Monitoring time Monitoring time for send/receive processing
Response notification method Timing for writing received data to memory used for
CJ-series Units in the PLC
One protocol
Sequence No. 000 to 999
(60 sequences max./protocol)
Transmission
control parameter
Link word setting
Send/receive
processing
monitoring time
Response
notification method
15 steps max.
Step 0
Step 1
One-step structure
With the Send, Recv,
Send&Recv command
Command (*1)
•
Next step
•
To specified step
•
Sequence end
•
Sequence interrupt
Error processing
Header Address Terminator Data Check
Messages (*2)
With the Wait, Flush, Open,
or Close command
Message list (*2)
Send message list
Receive message list
Reception matrix list (*2)
Reception matrix
Case No. 15
Repeated
N (no)
N (error)
Normal end
Command
(*1)
Next process
Next process
Case No. 00
Receive message
Header Address Terminator Data Check
15 steps max.
Step 0
Step 1
Y
Next process