Prosoft-technology MVI56E-MCMR Manual de usuario descargar pdf (Pagina 84)

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

User Manual Modbus Communication Module with Reduced Data Block

Page 84 of 225 ProSoft Technology, Inc.

May 13, 2014

Although these are valid addresses, they will not work in the application. The

Master must issue a Write command to the addresses that correspond to the

READDATA array. For Modbus addresses 3x, these are considered Input

registers, and a Modbus Master does not have a function code for this type of

data.

Customizing the Memory Map

In some cases, the above memory map will not work for the application.

Sometimes a Master must read bits starting at address 0001, and must also read

a register starting at 40001. With the memory map in this example (page 83), this

is not possible, as WRITEDATA[0] is seen as both 0001 to 0016, and 40001. To

accommodate this, you can customize the starting location within the module for

each device using the parameters shown below.

Parameter

Value

Description

Bit Input Offset

Defines the starting address within the module for 1x

Modbus addressing. A value of 0 sets 10001 to 10016 as

address 0 in the MVI56E-MCMR module.

Word Input Offset

Defines the starting address within the module memory

for 3x registers.

Output Offset

1000

Defines the starting address within the module for 0x

coils.

Holding Register Offset

1010

Defines the starting address within the module for 4x

addressing.

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Prosoft-technology MVI56E-MCMR Manual de usuario Pagina 84