ProSoft Technology MVI71-MNET - Manual (Page 36)

MVI71-MNET ♦ PLC Platform Module Configuration
Modbus TCP/IP Interface Module User Manual
Page 36 of 109
ProSoft Technology, Inc.
June 23, 2009
Modbus Function
1, 2, 3, 4, 5, 6, 15, 16
This parameter specifies the Modbus function to be executed by the command.
These function codes are defined in the Modbus protocol. The following table
defines the purpose of each function supported by the module. More information
on the protocol is available from the Schneider Electric web site
(www.modicon.com).
Modbus Function Code Description
1 Read Coil Status
2 Read Input Status
3 Read Holding Registers
4 Read Input Registers
5 Single Coil Write
6 Single Register Write
15 Multiple Coil Write
16 Multiple Register Write
MB Address in Device
This parameter specifies the starting Modbus register or digital point address to
be considered by the command in the Modbus slave device. Refer to the
documentation of each Modbus slave device on the network for their register and
digital point address assignments.
The FC determines the addresses range and that this value will be the register or
bit OFFSET into a given data range. For instance, if the command is to be a bit
command (FC 1, 2, 5, or 15) to Read/Write a Coil 0X address 00001, then the
value to enter here would be 0. For Coil address 00110, the value here would be
109. For register Read/Write commands (FC 3, 4, 6, or 16) in the 3X (FC4) or 4X
(FC3), say 30001 or 40001, the value here would, again be 0. For 31101 or
41101, the value to enter for this parameter would be 1100.
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