YASKAWA Varispeed G7 Series Instruction Manual page 329

Con-
stant
Number
H5-10
*2
* 1. Set H5-01 to 0 to disable Inverter responses to MEMOBUS communications.
* 2. Applicable for G7-Series Inverters with software versions PRG 1039 and 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.
The space between messages must support the following.
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).
-96
6
Name
Description
Display
Unit Selection
Selects the units used for MEMO-
for MEMOBUS
BUS registry 0025H (monitors
Register 0025H
the output voltage reference).
0: 0.1 V units
MEMOBUS
1: 1 V units
25H UNIT
Slave address
Function code
Data
Error check
PLC to Inverter
Command message
24 bits long
Setting Factory
Range Setting
0 or 1 0
Inverter to PLC
Command message
Response message
24 bits long
H5-06
5 ms min.
setting
Fig 6.61 Message Spacing
Control Methods
Change
Open
during
V/f Flux
Loop
Opera-
V/f with Vec-
Vector
tion
PG tor
1
No A A A A
PLC to Inverter
Time (Seconds)
MEMO
Open
BUS
Loop
Regis-
Vector
ter
2
A 436H