Omron SYSDRIVE 3G3JV-A4002, User Manual

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7-39
D
Step
•
In a single step, a DSR message is sent and a response for the DSR message is received. A step may
not include a response if it is a broadcast message.
•
In the case of repetitive actions to issue the RUN command and frequency reference to the Inverter
and read the status of the Inverter, for example, the actions to give the RUN command and frequency
reference is one step. The reason is that these register numbers are consecutive and can be sent with
a single DSR message. The action to read the status of the Inverter is another step.
•
A step includes a command and a maximum of two messages.
The above example uses the Send & Recv command. The DSR message and response are both mes-
sages.
•
A step may include the following parameters.
Parameter Description
Command The Send, Send & Recv, Wait, Flush, Open (ER-ON), or Close
(ER-OFF) command is set.
Note In 7-10-4 Creating a Project File , an example is shown with
the Send & Recv command used. The Send command is
used for a broadcast message.
Message
Send message A DSR message is set for the Send command used.
g
Recv message A response is set for the Recv command.
Send & Recv message A DSR message and response are set for the Send & Recv
command.
Recv matrix If there are two or more responses for the Send or Send & Recv
command, the next process is selected per response.
Repeat counter The number (N) of times to repeat the step is set within a range
from 0 to 255.
It is possible to change messages by making use of the number
(N).
Note In 7-10-4 Creating a Project File , an example is shown with
this function used for enabling three Slaves to repeat the
same process.
Number of retries The number of times to retry the command can be set within a
range from 0 to 9 only when the Send & Recv command is used.
Note It is recommended that the number be set to 3 or larger.
Send Wait Time The waiting time until data is sent with the Send or Send & Recv
command executed.
Response Write (with operand specified) Determines whether or not to write the reception data in the
response.
Note In 7-10-4 Creating a Project File , an example is shown with
this function used for writing the Inverter status to the
memory.
Next process Determines which step is to be processed next or finishes the
operation after the step is finished normally.
Error processing Determines which step is to be processed next or finishes the
operation, if the step has an error.
Communications Chapter 7