Rockwell Automation 20-COMM-Q ControlNet Adapter User Manual
Page 173
Using Explicit Messaging
6-45
20-COMM-C/Q ControlNet Adapter User Manual
Publication 20COMM-UM003F-EN-P
SLC 500 Controller – Formatting a Message to Write a Single Parameter Using
Read/Write Parameter Service
Figure 6.55 Write Parameter Message Configuration Screen
The following table identifies the data that is required in each box to
configure a message to write a single parameter.
General Tab
Example Value
Description
1747-SCNR Slot
Size in Words (Send Data)
Data Table Address (Send Data)
Message Timeout
ControlNet Addr
Service
(1)
Instance
(2)
1
1
(3)
N50:0
500
2
Write Parameter
140 (Dec.)
The chassis slot occupied by the scanner.
Number of words to be sent (written). Each word size is a 16-bit integer.
An unused controller data table address containing the message
instruction. This address is the starting word of the source file.
The time (in milliseconds) that the message must be completed.
The node address of the adapter connected to the drive.
Code for the requested service.
Instance number is the same as the parameter number.
(1)
The default setting for Service is ‘Custom’, enabling entry of a Service Code not available from the Service pull-down menu. When choosing a
Service other than ‘Custom’ from the pull-down menu, an appropriate Hex. value is automatically assigned to the Service Code box which is
dimmed (unavailable).
(2)
Only drive parameters (Port 0) can be written to using Parameter Object Class code 0x0F. To write to a parameter of a peripheral in another port,
use DPI Parameter Object Class code 0x93 (see
).
(3)
In this example, Accel Time 1 is a 16-bit integer parameter requiring the Size in Words field to be set to ‘1’. If the parameter being written to is a
32-bit integer, the Size in Words must be set to ‘2’. When using a PowerFlex 700S or PowerFlex 750-Series drive, Accel Time 1 is a floating point
number requiring the Size in Words to be set to ‘2’. See the drive documentation to determine the size of the parameter and its data type (16-bit
or 32-bit integer or REAL).