Appendix
22
BK8000
Appendix
Sample arrangement of a process image in
the bus coupler
The following example will illustrate the assignment of input/output
channels to the process image. Our sample construction is to consist of the
following bus terminal components:
For this configuration
Position
Function component on the track
the bus coupler will create
POS01
Bus coupler
the list of assignments
POS02
2-channel digital input
shown below
POS03
2-channel digital input
POS04
2-channel digital input
POS05
2-channel digital input
POS06
2-channel digital input
POS07
2-channel digital output
POS08
2-channel digital output
POS09
2-channel digital output
POS10
2-channel analog input
POS11
2-channel analog output
POS12
2-channel analog output
POS13
2-channel analog input
POS14
Power input terminal
POS15
2-channel digital input
POS16
2-channel digital input
POS17
2-channel digital input
POS18
2-channel digital output
POS19
2-channel digital output
POS20
2-channel analog output
POS21
End terminal
In the default settings, RS485, RS232, CANopen, DevicNet, InterBus and
Profibus couplers only map the analog input/output terminals in 16-bit wide
signal channels. The CONTROL/STATUS byte is not available. That is to
say, an analog terminal with two channels, for example, appears with two
times 16 bits in the process image. The PLC interface is not integrated in
the process image. Accordingly, the byte address and allocation mappings
present themselves differently when CONTROL/STATUS is activated. For
the function and system terminals, refer to the terminals' configuration
instructions for details of the mapping in the bus coupler process image.
Area for byte-oriented
data, analog outputs
Relative byte
address
Bit position
Process image in
the control unit
Position in the
block
0, 1
none
O0, O1
POS11
2, 3
none
O2, O3
POS11
4, 5
none
O4, O5
POS12
6, 7,
none
O6, O7
POS12
8, 9
none
O8, O9
POS20
10, 11
none
O10, O11
POS20
