Instruction manual


Message format
For communications, the master (PLC) sends a command
to the slave (VS-606V7) and the slave responds to it. The
configuration for sending and receiving is as shown to the
right. The length of the data varies according to the
contents of commands (functions).
The interval between messages must be maintained at the
following amount.
• Slave address: Inverter address (0 to 32)
Setting to 0 indicates simultaneous broadcasting. The
inverter does not respond to the command from the master.
• Function code: Command codes (See below.)
• Data: Composes a series of data by combining holding register numbers
(test codes for loop-back numbers) and their data. Data length
depends on the contents of the commands.
• Error check: CRC-16 (Calculate the value by the following method.)
1. The default value at calculation of CRC-16 is normally 0. In the
MEMOBUS system, change the default to 1 (all 1 to 16-bit).
2. Calculate CRC-16 assuming that the loop address LSB is MSB
and the last data MSB is LSB.
3. Also calculate CRC-16 for a response message from the slave and
refer it to CRC-16 in the response message.
92
PLC - VS-606V7
24 bits n156 setting
Reference
message
Reference
message
Reference
message
VS-606V7 - PLC PLC - VS-606V7
24 bits 10ms or more
t (sec)
8
Function Code
Hexadecimal
03H
Function
08H
10H
Reading holding
register contents
Loop back test
Write in several
holding registers
Reference Message
Mnimum (Byte) Mnimum (Byte)
Maximum (Byte)
Maximum (Byte)
8
8
8
888
8
737
11 41
Response Message
Slave address
Function code
Data
Error check