BECKHOFF BK3000 User Manual
Page 16
Basic information
16
BK3xxx/LC3100
Default
assignment
of
inputs and outputs to the
process image
When the bus coupler is first switched on it determines the number of
attached bus terminals and sets up a list of assignments. This list
distinguishes between analog channels and digital channels and between
input and output; which are grouped separately. The assignments begin
immediately to the left of the bus coupler. The software in the bus coupler
creates the assignment list by collecting the entries for the individual
channels one at a time, counting from left to right. These assignments
distinguish four groups:
Function type of the channel
Assignment level
1.
Analog outputs
byte-wise assignment
2.
Digital outputs
bit-wise assignment
3.
Analog inputs
byte-wise assignment
4
Digital inputs
bit-wise assignment
Analog inputs/ouputs are representative of other complex multi-byte signal
bus terminals (RS232, SSI sensor interface, ...)
Overview of the subdivision of the process image in the bus coupler:
Output data in the bus
coupler
O0
...
byte-oriented data
...
Ox
Ox+1
bit-oriented data
Ox+y
Input data in the bus
coupler
I0
...
byte-oriented data
...
Ix
Ix+1
...
bit-oriented data
...
Ix+y