Beckhoff KL8001, Documentation

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Access from the user program
KL8001 and KL9060 28 Version: 2.0.0
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
without
Word-Alignment* Byte-Offset
with
Word-Alignment* Format Input data Output data
0 0 Byte
Status-Byte 0 ( SB0 [
}
28] ) Control-Byte 0 ( CB0 [
}
28] )
1 2 Word DataIN0 DataOUT0
3 4 Byte
Status-Byte 1 ( SB1 [
}
28] ) Control-Byte 1 ( CB1 [
}
28] )
4 6 Word DataIN1 DataOUT1
6 8 Byte
Status-Byte 2 ( SB2 [
}
28] ) Control-Byte 2 ( CB2 [
}
28] )
7 10 Word DataIN2 DataOUT2
9 12 Byte
Extended Status-Byte ( ESB [
}
31] ) Extended Control-Byte ( ECB [
}
30] )
10 14 Word not used** not used**
*) 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.