Message Format; Slave Address - Omron VARISPEED F7 User Manual

Related Parameters
Parameter
No.
b1-01 Reference source selection
b1-02 RUN command Source Selection
H5-01 Station address
H5-02 Baud rate selection
H5-03 Communications parity selection
H5-04 Communications fault detection selection
H5-05 Communications fault detection selection
H5-06 Send wait time
H5-07 RTS control ON/OFF
* 1. Set H5-01 to 0 disable Inverter responses to MEMOBUS communications.
MEMOBUS communications can perform the following operations regardless of the settings in b1-01 and
b1-02.
Monitoring operation status of the inverter
•
Setting and reading parameters
•
Resetting faults
•
Inputting multi-function commands. (An OR operation is performed between the multi-function com-
•
mands input from the PLC and commands input from digital input terminals S3 to S7.)

Message Format

In MEMOBUS communications, the master sends commands to the slave, and the slave responds. The mes-
sage format is configured for both sending and receiving as shown below, and the length of data packets
depends on the command (function) content.
The space between messages must meet the following conditions:
PLC to Inverter
Command message
24 bits long

Slave Address

Set the Inverter address from 0 to 31. If you set 0, commands from the master will be received by all slaves.
(Refer to "Broadcast Data" on the following pages.)
Name
Slave address
Function code
Data
Error check
Inverter to PLC
Response message
H5-06
24 bits long
setting
Fig 6.77 Message Spacing
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
1 No Q Q
1 No Q Q
* 1
No A A
1F
3 No A A
0 No A A
3 No A A
1 No A A
5 ms No A A
1 No A A
PLC to Inverter
Command message
Time (Seconds)
5 ms min.
Open Closed
Loop Loop
Vector Vector
Q Q
Q Q
A A
A A
A A
A A
A A
A A
A A
6
85
6-