Omron SYSDRIVE 3G3JV User Manual page 164

Communications
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
Command
Message g
Send message
Recv message
Send & Recv message A DSR message and response are set for the Send & Recv
Recv matrix
Repeat counter
Number of retries
Send Wait Time
Response Write (with operand specified) Determines whether or not to write the reception data in the
Next process
Error processing
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.
A DSR message is set for the Send command used.
A response is set for the Recv command.
command.
If there are two or more responses for the Send or Send & Recv
command, the next process is selected per response.
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.
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.
The waiting time until data is sent with the Send or Send & Recv
command executed.
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.
Determines which step is to be processed next or finishes the
operation after the step is finished normally.
Determines which step is to be processed next or finishes the
operation, if the step has an error.
Chapter 7
Description
7-39