Beckhoff KL2791 Series, Documentation

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Access from the user program
KL2791 32 Version: 2.0.0
6 Access from the user program
6.1 Process image
The KL2791 is represented in the complex process image with 3 bytes of input data and 3 bytes of output
data. These are organized as follows:
Byte offset (without
word alignment) Byte offset (with word align-
ment*) Format Input data Output data
0 0 Byte
SB [
}
32] CB [
}
32]
1 2 Word DataIN DataOUT
The KL2791 is represented in the compact process image without input data and with 2 bytes of output
data. These are organized as follows:
Byte offset (without
word alignment) Byte offset (with word align-
ment*) Format Input data Output data
0 0 Word - DataOUT
*) Word alignment: The Bus Coupler places values on even byte addresses
Key
SB: Status byte
CB: Control byte
DataIN: input word
DataOUT: output word
In process data mode, the output word DataOUT controls the output power of the speed controller terminal.
Valid values are 0
dec
to 32767
dec
.
6.2 Control and status bytes
Process data mode
Control byte (for process data mode)
The control byte (CB) is located in the output image [
}
32] , and is transmitted from the controller to the
terminal.
Bit CB.7 CB.6 CB.5 CB.4 CB.3 CB.2 CB.1 CB.0
Name RegAccess - - - - - - -
Key
Bit Name Description
CB.7 RegAccess 0
bin
Register communication off (process data mode)
CB.6 to CB.0 - 0
bin
reserved
Status byte (for process data mode)
The status byte (SB) is located in the input image [ } 32] , and is transmitted from terminal to the controller.
Bit SB.7 SB.6 SB.5 SB.4 SB.3 SB.2 SB.1 SB.0
Name RegAccess Error Temperatur
e warning Overload Operation mode Synchrono
us