Omron SYSDRIVE RV Series User Manual page 331

Configuration of the Protocol Macro Function
The protocol consists of one or more sequences. A sequence is an independent set of actions to perform
together with a general-purpose peripheral device, such as an Inverter. For example, the RUN command and
the frequency reference are given to the Inverter and the status of the Inverter is read in a single sequence.
A sequence consists of one or more steps. A step consists of a Send & Recv command + a Send & Recv mes-
sage + a step branch in accordance with the processing result + Completion.
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. On
page 126 under Creating a Project File, an example is shown with all actions registered as a single sequence.
A sequence may include the following parameters.
Parameter
Set the method of control, such as flow control.
Transmission control
Select only modem control for communications with the 3G3RV.
Set the area for sharing the data between the Programmable Controller and Communications
Link word Board.
On page 126 under 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.
Monitor time
Set a period of approximately 0.5 s each for communications with the 3G3RV.
A method to write reception data to the I/O memory of the Programmable Controller.
Response notify method
Select "notify by scan" for communications with the 3G3RV.
CPU Unit
PMCR instruction
Serial Communications Board
Step 00 Step 00
(Write the RUN command
and frequency response.)
Step 01 Step 01
(Read the inverter status)
Fig 6.67
Communications Functions
Description
SYSDRIVE 3G3RV
DSR message
Response
Sequence 000 Sequence 000
DSR message
Response
(Inverter status)
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