Rockwell Automation 1734-VHSC24 Very High-Speed Counter Modules User Manual - Manual (Page 55)

Publication 1734-UM003B-EN-P - August 2005
Access Instantiated Instances 5-3
See the figure for an example, where you select Instance 101
(polled connection).
Assemblies Available assemblies are:
• Assembly 101 is produced for a polled connection.
• Assembly 102 is produced for a Change Of State (COS)
connection.
• Assemblies 103, 104, 107 and 108 are by Explicit message only.
• Assemblies 105 and 106 are consumed in a polled connection
(as directed by parameter 4).
Data may be read (get) or written (set) using an Explicit Message. For
example, to read the Present Channel Data, assembly 101
10
(65
16
) can
be requested.
Data is ordered as follows (byte 0 is the least significant byte):
8 bit byte Byte 0
16-bit word Byte 0, byte 1
32-bit long word Byte 0, byte 1, byte 2, byte 3
In this example, the table shows assembly 101 for the 1734-OE
module.
1. Type in the instance number
here. This is an example of
assembly number 102 (0x66).
The class is always 4 and the
attribute is always 3.
2. Click Execute.
3. Data received and status
information is recorded here.
4. Click Close to finish.
Service Class Instance Attribute
0E (Get) 04 (Assembly) 65 (Present Data) 03 (Data Attribute)