Note that – Rockwell Automation 20-COMM-E PowerFlex EtherNet/IP Adapter User Manual
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6-40
Using Explicit Messaging
20-COMM-E EtherNet/IP Adapter User Manual
Publication 20COMM-UM010G-EN-P
SLC 500 Controller – Formatting a Message to Write a Single Parameter Using
Generic Get/Set Attribute Service
Figure 6.47 Generic Set Attribute Single Message Configuration Screens
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
Size in Words
Data Table Address
Service
(1)
Class
Instance
(2)
Attribute
(3)
1
(4)
N50:0
Generic Set Attribute Single
93 or 9F (Hex.)
(5)
140 (Dec.)
9 or 10 (Dec.)
Number of words to be transferred. 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.
Code for the requested service.
Class ID for the DPI Parameter Object.
Instance number is the same as the parameter number.
Attribute number for the Parameter Value attribute.
MultiHop Tab
Example Value
Description
To Address
10.91.100.79
IP address of the adapter connected to the drive.
(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)
The instance is the parameter number in the drive (Port 0). To write to a parameter in another port, see
DPI Parameter Object on page C-16
Host DPI Parameter Object on page C-30
(Class code 0x9F) to determine the instance number. For example, to write to
parameter 4 of a peripheral in Port 5 of a PowerFlex 750-Series drive, the instance would be 21504 + 4 = 21508 or 5404 (Hex).
(3)
Setting the Attribute value to ‘9’ will write the parameter value to the drive’s Nonvolatile Storage (EEPROM) memory, which retains the
parameter value even after the drive is power cycled.
Important: When set to ‘9’, the EEPROM may quickly exceed its life cycle and cause the
drive to malfunction. Setting the Attribute value to ‘A’ (10 decimal) will write the parameter value to temporary memory, which deletes the
parameter value after the drive is power cycled. When frequent write messages are required, we recommend using the ‘A’ (10 decimal) setting.
(4)
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).
(5)
for limitations of PowerFlex 7-Class and PowerFlex 750-Series drives when using DPI Parameter Object Class
code 0x93 or Host DPI Parameter Object Class code 0x9F for explicit messaging.