Beckhoff KL6781, Documentation

Page: 22 / 32

Access from the user program
KL6781 22 Version: 2.0.0
4.4 Mapping
The Bus Terminals occupy addresses within the process image of the controller. The assignment of process
data (input and output data) and parameterization data (control and status bytes) to the control addresses is
called mapping. The type of mapping depends on:
• the fieldbus system used
• the terminal type
• the parameterization of the Bus Coupler (conditions) such as
◦ compact or complex evaluation
◦ Intel or Motorola format
◦ word alignment switched on or off
The following tables show the mapping depending on different conditions. For the content of the individual
bytes please refer to pages
Process image [
}
21] and Control and status word [
}
19] .
Compact evaluation
Note
No compact process image
The KL6781 cannot be operated with a compact process image (without control and status
word), since the control and status words are required for meaningful process data mode
operation of the terminal. The KL6781 is represented with its complex process image, even
if you set your Bus Coupler to a compact process image!
Complete evaluation
Complete evaluation in Intel format
Address Input data Output data
Conditions Word offset High byte Low byte High byte Low byte
Complete evaluation: any
Motorola format: no
Word alignment: any 0 SW CW
1 DataIN 1 DataIN 0 DataOUT 1 DataOUT 0
2 DataIN 3 DataIN 2 DataOUT 3 DataOUT 2
3 DataIN 5 DataIN 4 DataOUT 5 DataOUT 4
4 DataIN 7 DataIN 6 DataOUT 7 DataOUT 6
5 DataIN 9 DataIN 8 DataOUT 9 DataOUT 8
6 DataIN 11 DataIN 10 DataOUT 11 DataOUT 10
7 DataIN 13 DataIN 12 DataOUT 13 DataOUT 12
8 DataIN 15 DataIN 14 DataOUT 15 DataOUT 14
9 DataIN 17 DataIN 16 DataOUT 17 DataOUT 16
10 DataIN 19 DataIN 18 DataOUT 19 DataOUT 18
11 DataIN 21 DataIN 20 DataOUT 21 DataOUT 20