Atlas Copco Power Focus 3000 User Manual

Fieldbus
9836 3123 01 207 (428)
15.5 Fieldbus data format
This section describes the different data types that are used in the fieldbus configuration.
15.5.1 Bitmap select (Endian mode)
Big endian (Motorola mode) is default setting for ProfiBus-DP, Profinet IO, InterBus, Interbus 2Mb, CC-
link, ModBusPlus and ModBus TCP.
Little endian (Intel mode) is default setting for DeviceNet, ControlNet, Ethernet/IP and FL-net.
Big endian (Motorola mode)
Byte 0 (send 1 st)
Byte 1 (send 2 nd)
MS Byte (PF)
LS Byte (PF)
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Little endian (Intel mode)
Byte 1 (send 2 nd)
Byte 0 (send 1 st)
MS Byte (PF)
LS Byte (PF)
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
15.5.2 Fieldbus data types
The Power Focus uses position format in all encoding and decoding data types. In PF position format the
most significant bit (MSB) is the bit furthest to the left and the least significant bit (LSB) is the bit furthest
to the right.
If a data type is less than one word, the MSB is the bit furthest to the left. If data type is longer than one
word, the MSB is the bit furthest top-left. If a fieldbus type uses Intel Endian, byte numbers are swapped
before encoding or decoding to a specific data type.
The data field in the fieldbus is from the beginning a blank data field without structure. In order to file
Power Focus item data types into fieldbus we define fieldbus data type, which holds the information about
placement and structure of a certain application data type mapped into the fieldbus data field.
The table below shows the different data types used in fieldbus data. The section items from/to PF shows
the data type available for different items.

Atlas Copco Power Focus 3000 Specifications

General

Brand	Atlas Copco
Model	Power Focus 3000
Category	Control Systems
Language	English