BECKHOFF BK3000 - Manual (Page 38)

Appendix
38 BK3xxx/LC3100
Appendix
Example: 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 (this example is related to the standard
bus coupler; no analogue terminals can be configured for the Economy and
LowCost couplers):
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
Besides transfer of the user information signal, when using analog
terminals the control/status byte is also available via the process image by
parameterisation of a three-byte channel (see PROFIBUS-DP).
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 %QB0, %QB1 POS11
2, 3 none %QB2, %QB3 POS11
4, 5 none %QB4, %QB5 POS12
6, 7, none %QB6, %QB7 POS12
8, 9 none %QB8, %QB9 POS20
10, 11 none %QB10, %QB11 POS20