Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual - Manual (Page 81)

1 Publication 1760-UM003A-EN-P - September 2005
Chapter
7
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
32
hex
64
hex
01
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.