Yaskawa Modbus TCP/IP SI-EM3D - Manual (Page 28)

7 Modbus TCP/IP Messaging
u Modbus TCP/IP Overview
The Modbus TCP/IP protocol is essentially the Modbus protocol over an Modbus TCP/IP
network. A master controller (typically a PLC) sends commands to slave devices, which then
perform the specified functions and send a response to the master. The drive using the option
has slave functionality.
n Supported Modbus TCP/IP Commands
Table 6 Supported Modbus TCP/IP Commands
Function Code Function Name
03H Read Multiple Registers
06H Write Single Register
10H Write Multiple Registers
17H Read/Write Multiple Registers
n Drive Modbus TCP/IP Option Registers
All of the command registers, monitor registers, and parameters documented in the drive
Technical Manual are accessible via the option.
n High Speed Access Drive Modbus TCP/IP Option Registers
Many of the registers required for control have been specially mapped to provide higher speed
access to increase network performance. Use these registers for the best response times.
All of the drive command registers have been mapped to this high speed access area (Modbus
TCP/IP registers 01H to 01FH). In addition, the monitors shown in Table 7 are mapped for
high speed access.
7 Modbus TCP/IP Messaging
28 YASKAWA TOEP YAICOM 18A 1000-Series Option Dual-Port Modbus TCP/IP SI-EM3D Installation Manual