Prosoft-technology MVI71-MNET Uživatelský manuál stáhnout pdf (Strana 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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Prosoft-technology MVI71-MNET Uživatelský manuál Strana 36