Assemblies - Allen-Bradley 1734-IJ User Manual

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 and 106 are by Explicit message only.
• Assembly 105 is consumed in a polled connection .
Data may be read (get) or written (set) using an Explicit Message. For
example, to read the Present Channel Data, assembly 101
be requested.
Data is ordered as followed (byte 0 is the least significant byte):
8 bit byte
16 bit word
32 bit long word
In this example, assembly 101,
Service
0E (Get)
Instances Services
#101 (0x65) Get
#102 (0x66) Get
#103 (0x67) Get
#104 (0x68) Get
#105 (0x69) Set/Get
AB Drives
Byte 0
Byte 0, byte 1
Byte 0, byte 1, byte 2, byte 3
Class Instance
04 (Assembly) 65 (Present Data)
Field
Present Channel Data
Status
Stored Channel Data
Status
Present Channel Data
Stored Channel Data
Status
Programming Error Code
Counter Control
Publication 1734-UM006B-EN-P - August 2005
Access Instantiated Instances
(65 ) can
10 16
Attribute
03 (Data Attribute)
Bytes
4
2
4
2
4
4
2
2
1
5-3