Omron SYSDRIVE 3G3MV SERIES User Manual page 226

Communications
D Sequence
• When repeating actions to give the RUN command and frequency reference to the Inverter and read
the status of the Inverter, for example, the actions can be registered as one sequence, or more than
one if necessary. In 7-9-4 Creating a Project File, an example is shown with all actions registered as a
single sequence.
• A sequence may include the following parameters.
Parameter
Transmission control
parameter
Link word
Monitor time
Response notify
method
CPU Unit
PMCR
instruction
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.
7-36
Set the method of control, such as flow control.
Note Select only model control for communications with the 3G3MV.
Set the area for sharing the data between the Programmable Controller and
Communications Board.
Note In 7-9-4 Creating a Project File, an example is shown without such an area set.
Set the periods to monitor the transmission and reception steps with timers Tr, Tfr,
and Tfs.
Note Set a period of approximately 0.5 s each for communications with the 3G3MV.
A method to write reception data to the I/O memory of the Programmable
Controller.
Note Select "notify by scan" for communications with the 3G3MV.
Communications Board
Description
Step 00
DSR message
(Write the RUN command and
frequency reference.)
Response
Step 01
DSR message
Inverter status read
Response
(Inverter status)
Chapter 7
3G3MV
Sequence 000