Prosoft-technology MVI56E-MCMR Manual do Utilizador descarregar pdf (Página 186)

Reference MVI56E-MCMR ♦ ControlLogix Platform

User Manual Modbus Communication Module with Reduced Data Block

Page 186 of 225 ProSoft Technology, Inc.

May 13, 2014

6.6.7 Preset Single Register (Function Code 06)

Query

Function (06) allows the user to modify the contents of a holding register. Any

holding register that exists within the controller can have its contents changed by

this message. However, because the controller is actively scanning, it also can

alter the content of any holding register at any time. The values are provided in

binary up to the maximum capacity of the controller unused high order bits must

be set to zero. When used with Slave address zero (Broadcast mode) all Slave

controllers will load the specified register with the contents specified.

Note Functions 5, 6, 15, and 16 are the only messages that will be recognized as valid for

broadcast.

Adr

Func

Data Start Reg

Data #of Regs Hi

Data #of Regs Lo

Error Check Field

CRC

Response

The response to a preset single register request is to re-transmit the query

message after the register has been altered.

Adr

Func

Data Reg Hi

Data Reg Lo

Data Input Reg Hi

Data Input Reg Lo

Error Check Field

CRC

1 2 ... 181 182 183 184 185 186 187 188 189 190 191 ... 224 225

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Prosoft-technology MVI56E-MCMR Manual do Utilizador Página 186