Rockwell-automation 900 Temperature Controller Communications Function Manual do Utilizador descarregar pdf (Página 73)

Publication 900-UM004D-EN-E - July 2010

Modbus Communications Procedure 4-15

Variable Write, Single/Operation Command

This function performs operations such as writing to the variable area (single)

and operation commands (communications writing, RUN/STOP, multi-SP,

AT execute/cancel, write mode, save RAM data, software reset, move to setup

area 1, move to protect level, auto/manual switch, initialize settings, alarm

latch cancel, invert direct/reverse operation, and program start.) Writing is

enabled in only the 2-byte mode.

Figure 4.15 Command Frame

Figure 4.16 Response Frame

Write variable address

Specify the address of the setting data that is to be written. For details

on addresses, refer to Communications Data for Modbus on page 5-1.

For an operation command, specify 0000 or FFFF.

CRC-16

11 2 2

H'06

Write data

2 bytes

Slave

address

Function

code

Write variable

address

CRC-16

11 2 2

H'06

Write data

2 bytes

Slave

address

Function

code

Write variable

address

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Rockwell-automation 900 Temperature Controller Communications Function Manual do Utilizador Página 73