Rockwell-automation 1760-DNET Pico DeviceNet Communications Module Use Manual de usuario descargar pdf (Pagina 81)

1 Publication 1760-UM003A-EN-P - September 2005

Chapter

Pico GFX Control Commands

Control commands can be used to initiate data exchange for special

services:

• Read/write date and time (page 7-2)

• Read/write image data (page 7-7)

• Read/write function block data (page 7-20)

The DeviceNet master in this case falls back upon the message

transfer protocol of the explicit messages. All parameters are

addressed via the Service Code 32

hex

. The assigned attribute ID is

here used to distinguish between different parameters.

A data exchange procedure is required in order to ensure the safe

exchange of data via DeviceNet from master to slave and vice versa.

Service code Object address

Class ID Instance ID

hex

TIP

The I/O data retain their previously defined state

while a control command is being executed. The I/O

data will not be updated until data exchange for the

control command has been terminated.

IMPORTANT

You may use only the values specified for the

instruction code.

Verify data to be transferred in order to avoid

unnecessary errors.

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Rockwell-automation 1760-DNET Pico DeviceNet Communications Module Use Manual de usuario Pagina 81