Message Format; Slave Address - YASKAWA Varispeed G7 Instruction Manual

Name
Con-
stant
Display
Number
Unit Selection
Selects the units used for MEMO-
for MEMOBUS
BUS registry 0025H (monitors
H5-10
Register 0025H
the output voltage reference).
*2
0: 0.1 V units
MEMOBUS
1: 1 V units
25H UNIT
* 1. Set H5-01 to 0 to disable Inverter responses to MEMOBUS communications.
* 2. Applicable for G7-Series Inverters with software versions PRG: 1039 or later.
MEMOBUS communications can perform the following operations regardless of the settings in b1-01 and b1-
02.
Monitoring operation status from the PLC
•
Setting and reading constants
•
Resetting errors
•
Inputting multi-function commands
•
An OR operation is performed between the multi-function commands input from the PLC and commands
input from multi-function contact input terminals S3 to S12.

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 is
changed by the command (function) contents.

Slave address

Function code
Data
Error check
The space between messages must support the following.
PLC to Inverter
Command message
24 bits long
Slave Address
Set the Inverter address from 0 to 20 Hex. If you set 0, commands from the master will be broadcast (i.e., the
Inverter will not return responses).
Setting
Description
Range
0 or 1
Inverter to PLC
Response message
24 bits long
H5-06
setting
Fig 6.60 Message Spacing
Control Methods
Change
Open
Factory during
V/f
Loop
Setting Opera-
V/f with
Vector
tion
PG
1
0 No A A A
PLC to Inverter
Command message
Time (Seconds)
5 ms min.
Individual Functions
MEMO
Open
BUS
Flux
Loop
Regis-
Vec-
Vector
ter
tor
2
A A 436H
95
6-