Omron SYSDRIVE 3G3RV, User Manual

Page: 315 / 446

Communications Functions
6-
99
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 consti-
tute
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 com-
mand.
The DSR message and response are both messages.
A
step may include the following parameters.
Parameter Description
Command
The
Send, Recv, Send & Recv, Wait, Flush, Open (ER-ON) or Close (ER-OFF) is set.
Under
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.
Recv
message
A
response is set for the Recv command.
Send
& Recv mes-
sage
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).
Under
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.
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.
Under
Creating a Project File, an example is shown with this function used for writ-
ing
the Inverter status to the memory.
Next
process
Determines
which step is to be processed next, or finishes the opertion after the step is
finished
normally.
Error
processing
Determines
which step is to be processed next, or finishes the operation, if the the step
has
an error.