Group Send - Orientalmotor AR Series FLEX DC User Manual

Group send

9 Group send

Multiple slaves are made into a group and a query is sent to all slaves in the group at once.
„ Group composition
A group consists of one parent slave and child slaves and only the parent slave returns a response.
„ Group address
To perform a group send, set a group address to the child
slaves to be included in the group.
The child slaves to which the group address has been set
can receive a query sent to the parent slave.
• Parent slave
No special setting is required on the parent slave to
perform a group send. The address of the parent slave
becomes the group address.
When a query is sent to the parent slave from the master, the parent slave executes the requested process and then
returns a response (same as with the unicast mode).
• Child slave
Use a "group" command to set a group address to each child slave. Change the group in the unicast mode.
When performing read or write for setting a group, set the upper and lower simultaneously.
Resister address
Dec
48
49
Note
Since the group setting is not saved in the non-volatile memory even when the "batch NV memory
write" executes, the group setting will be cleared when turning the driver power OFF.
„ Function code to execute in a group send
Function code
10h
Master controller
−158−
5 Method of control via Modbus RTU (RS-485 communication)
Name
Hex
0030h Group (upper)
0031h Group (lower)
Function
Writing to multiple holding registers
Parent
slave
Address 1
"group" command: -1
(individual)
Master
Parent slave
Master
Child slave
READ/
Description
WRITE
Sets the group
R/W
address.
Child
slave
Address 2
"group" command: 1
Query (sent to
the parent slave)
Response
Query (sent to
the parent slave)
Executes the
process but does
not send a response.
Setting range
−1: No group specification (Group send
is not performed)
1 to 31: Group address (Address
number of parent slave)
Child
slave
Address 3
"group" command: 1