Rockwell Automation PowerFlex 750-Series, Руководство пользователя

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6-6 Using Explicit Messaging
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-EN-P
ControlLogix – Formatting a Message to Write Single Parameter
Figure 6.5 Set Attribute Single Message Configuration Screens
The following table identifies the data that is required in each box to
format a single write message.
Configuration Tab Example Value Description
Message Type
Service Type
(1)
Service Code
(1)
Class
Instance
Attribute
(2)
Source Element
Source Length
Destination
CIP Generic
Set Attribute Single
10 (Hex.)
93 (Hex.)
535 (Dec.)
9 or A (Hex.)
Accel_Time_1
(4)
4 bytes
(4)
—
Used to access the Parameter Object in the Option Module.
This service is used to write a parameter value.
Code for the requested service.
Class ID for the DPI Parameter Object.
Instance number is the same as parameter number.
Attribute number for the Parameter Value attribute.
Name of the tag for any service data to be sent from the
scanner to the Option Module/drive.
Number of bytes of service data to be sent in the message.
Leave blank (not applicable).
Communication Tab Example Value Description
Path
(3)
My_DeviceNet_Scanner The path is the route that the message will follow.
Tag Tab Example Value Description
Name Single_Write_Message The name for the message.
(1)
The default setting for Service Type is “Custom,” enabling entry of a Service Code not available from the Service Type
pull-down menu. When selecting a Service Type other than “Custom” from the pull-down menu, an appropriate Hex. value
is automatically assigned to the Service Code box which grays out (unavailable).
(2)
Setting the Attribute value to “9” will write the parameter value to the drive’s Non-Volatile Storage (EEPROM) memory, so
the parameter value will remain even after the drive is power cycled. Important: When set to “9,” be very cautious as the
EEPROM may quickly exceed its life cycle and cause the drive to malfunction. Setting the Attribute value to “A” will write the
parameter value to temporary memory, so the parameter value will be lost after the drive is power cycled. It is
recommended to use the “A” setting when multiple write messages are required.
(3)
Click Browse to find the path, or type in the name of the device listed in the I/O Configuration folder (for this example,
My_DeviceNet_Scanner). Then always type in a comma followed by a “2” which is the DeviceNet scanner port, followed by
another comma, and then the node of the drive (for this example, “1”).
(4)
In this example, Accel Time 1 is a 32-bit floating point parameter and the Data Type field must be set to “REAL” when
creating the controller tag. To write to a 32-bit DINT parameter, set the tag Data Type field to “DINT.” For a 16-bit parameter,
set the Data Type field to “INT.” Also, the Source Length field on the Message Configuration screen must correspond to the
selected Data Type in bytes (for example, 4 bytes for a REAL or a DINT, or 2 bytes for an INT). Refer to the drive
documentation to determine the size of the parameter.