Access From The User Program; Process Image; Control And Status Bytes - Beckhoff KL8001 Documentation

Access from the user program

5 Access from the user program
5.1

Process image

The power terminal is represented in the process image with 12 bytes of input and output data each. These
are organized as follows:
Byte-Offset Byte-Offset
without with
Word-Alignment* Word-Alignment*
0 0
1 2
3 4
4 6
6 8
7 10
9 12
10 14
*) Word-Alignment: The Bus Coupler places values on even byte addresses
**) The process image is extended by an unused word in the input and output range, so that the power
terminal appears like a four-channel analog terminal.
5.1.1

Control and Status Bytes

The control bytes 0 (CB0), 1 (CB1) and 2 (CB2) are in the output image [} 28] and are transferred from the
controller to the power terminal. Pay attention to the assignment [} 41] of the control bytes to the process
input data words in process data mode.
The status bytes 0 (SB0), 1 (SB1) and 2 (SB2) are in the input image [} 28] and are transferred from the
power terminal to the controller.
Since the structure and application of the control and status bytes are identical, they are described below
using control byte 0 (CB0) and status byte 0 (SB0) as examples.
28
Format Input data
Byte
Status-Byte 0 (SB0 [} 28])
Word DataIN0
Byte
Status-Byte 1 (SB1 [} 28])
Word DataIN1
Byte
Status-Byte 2 (SB2 [} 28])
Word DataIN2
Byte
Extended Status-Byte (ESB [} 31])
Word not used**
Version: 2.0.0
Output data
Control-Byte 0 (CB0 [} 28])
DataOUT0
Control-Byte 1 (CB1 [} 28])
DataOUT1
Control-Byte 2 (CB2 [} 28])
DataOUT2
Extended Control-Byte (ECB [} 30])
not used**
KL8001 and KL9060