Message Format - Omron VARISPEED E7 User Manual

Beside MEMOBUS the drive is also capable of using Metasys N2 communications via the RS485/422
•
port. Setting parameter H5-08 to 0 activates MEMOBUS communication, setting 1 enables Metasys N2.
Note: A additional manual for the Metasys N2 protocol is available on request.
The setting of parameter H5-09 determines the length of time that serial communications must be lost
•
before a CE fault occurs.
Setting Precautions
If the Inverter trips with CE faults with a communication speed setting of 19200 bps, lower the communi-
•
cation speed.
• If the Inverter trips with CE faults with lower communication speed selections lengthen the send wait time
in parameter H5-06
• If the Inverter's station address is set to 0 it will ignore all messages from the master.

Message Format

In MEMOBUS communication the master sends commands to the slave and the slave responds. The message
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:
Slave Address
Set the address from 0 to 32. If set to 0, commands from the master will be received by all slaves. (Refer to
"Broadcast Data" on the following pages.)
Function Code
The function code specifies commands. The three function codes shown in the table below are available.
Function Code
(Hexadecimal)
03H
08H
10H
6-72
PLC to Inverter
Inverter to PLC
Response message
Command message
H5-06
24 bits long
setting
Fig 6.53 Message Spacing
Function
Read memory register contents
Loopback test
Write multiple memory registers
Slave address
Function code
Data
Error check
PLC to Inverter
Command message
5 ms min.
24 bits long
Command Message
Min. (Bytes) Max. (Bytes)
8
8
11
Time
Response Message
Min. (Bytes) Max. (Bytes)
8 7 37
8 8 8
41 8 8