Prosoft-technology MVI56E-MCMR Manual de usuario descargar pdf (Pagina 70)

Configuring the MVI56E-MCMR Module MVI56E-MCMR ♦ ControlLogix Platform

User Manual Modbus Communication Module with Reduced Data Block

Page 70 of 225 ProSoft Technology, Inc.

May 13, 2014

Preset (Write) Single Coil 0x (Modbus Function Code 5)

Used to write a Coil of a slave device, these are single-bit addresses within a

Modbus slave device. The Internal Address field of this command is defined

down to the bit level within the module memory, and should come from an area

of memory that has been defined within the MCMR.DATA.WRITEDATA area (this

is configured within BACKPLANE CONFIGURATION).

The following illustration shows a sample command to write Modbus addresses

0513 of Modbus Slave Device Address 1, only when the data associated with the

Internal Address has changed.

Parameter

Description

Enable = 2

The module will send the command only when the data within the

Internal Address field of the module has changed.

Internal Address = 160

Will write the data to the slave device when the value at

WriteData[10].0 has changed. Because this is a bit-level command,

the Internal Address field must be defined down to the bit level.

Reg Count = 1

Will write a single bit to the device (Function Code 5 will 1 support a

count of 1).

Node Address = 1

Issues the Modbus command to Modbus Slave Device Address 1.

Modbus Function = 5

Issues Modbus Function Code 5 to write a single coil.

MB Address in Device =

512

Function Code 5, MB Address in Device of 512 will read address

0513

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 224 225

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Prosoft-technology MVI56E-MCMR Manual de usuario Pagina 70