Beckhoff KL3444, Documentation

Page: 43 / 58

Access from the User Program
KL3444, KL3448, KL3454 und KL3458 43 Version: 3.2.0
7 Access from the User Program
7.1 Process image
KL3404 and KL3464 as well as KL3444 and KL3454
KL3404 and KL3464 as well as KL3444 and KL3454 represent themselves in the process image with up to
12 bytes of input data and 12 bytes of output data.
Format Input data Output data
Byte SB1: CB1
Word DataIN1 DataOUT1
Byte SB2 CB2
Word DataIN2 DataOUT2
Byte SB3 CB3
Word DataIN3 DataOUT3
Byte SB4 CB4
Word DataIN4 DataOUT4
Key
SB n: Status byte for channel n
CB n: Control byte for channel n
DataIN n: Input data word channel n
DataOUT n: Output data word channel n
• Please refer to the Mapping [
}
44] page for the assignment of the bytes and words to the addresses
of the controller.
• The meaning of the control and status bytes is explained in Control and status bytes .
• In process data mode the analog values are transferred in input data words DataIN1 to DataIN4.
Output data words DataOUT1 to DataOUT4 are not used.
KL3408 and KL3468 as well as KL3448 and KL3458
KL3408 and KL3468 as well as KL3448 and KL3458 represent a special case with regard to the process
image:
Essentially, two four-channel terminals are accommodated in one terminal housing, which behave like two
terminals for the K-bus.
Each of these eight channel analog terminals has the same process image like two four channel terminals of
same signal type, plugged next to each other. The KS2000 configuration software and the TwinCAT System
Manager display them like two separate four channel analog terminals.
Special treatment for 8-channel analog terminals
Regarding K-bus diagnosis for your Bus Coupler (e.g. for flashing codes, error code and error argu-
ment), note that these eight channel analog terminals are represented as two four channel terminals
from a Bus Coupler perspective. If the Bus Coupler is the fault location in the event of an error, you
must count each eight channel analog terminal as two terminals!