Slave Address; Function Code - Omron SYSDRIVE 3G3MV User Manual

Communications
H Message Data Configuration
The communications message is configured entirely of hexadecimal data. (ASCII and
·
FINS are not used.)
Communications data is divided into the four areas shown in the following table.
·
Data name

Slave address

Function code

Communications data
Error check
Note In the above communications, the default is --1 (65535) and the LSB (least-signifi-
cant byte) is converted as MSB (most-significant byte) (in the opposite direction).
The CRC-16 check is automatically performed by using the protocol macro func-
tion of OMRON's SYSMAC CS1-series or C200HX/HG/HE Programmable Con-
trollers.
H Slave Address
·The Master can communicate with a maximum of 32 Slaves over RS-422/485. A
unique Slave address is allocated to each Slave (Inverter) for communications.
·Slave addresses are within a range from 00 to 32 (00 through 20 Hex). If a DSR mes-
sage is issued to Slave address 00, the message will be a broadcast message.
Note The broadcast message is addressed to all Slaves. Only the RUN command
(register 0001 Hex) and frequency command (register 0002 Hex) can be written
to the message. The Inverter receiving this message does not return a response
regardless of whether or not the message is received properly. Therefore, for
measures against communications errors, the monitor function of the Inverter
should be used for checking the reception of broadcast messages.
H Function Code
·The function code is a command giving instructions of the details of processing to the
Inverter.
Set the Slave address (the set value in n153) of the Inverter, to
which the DSR message is sent. The Slave address must be
within a range from 00 to 32 (00 to 20 Hex).
A command giving instructions of the details of processing to
the Inverter.
Example: Data read (03 Hex) and data write (10 Hex)
Data attached to the command.
Example: The register number of read start data and the
number of registers of read data
CRC-16 check code for checking the reliability of the message
data.
Description
Chapter 7
7-11