Programming
BC8050 und BC8150
47
Version: 3.0.0
Differences in the protocols
The data for the higher-level master, Modbus or KS8000 protocol are stored in the BC8150 from address
1000. For Modbus the maximum data length is 512 bytes and does not have to be set within the range 1 to
126 words. For the KS8000 protocol the number of data from address 1000 is preset to 8 words or 16 bytes
inputs and 8 words or 16 bytes outputs. The BC8150 will reject data telegrams that do not match this number
exactly and issue an error. This data length can be parameterized via a function block in the BC8150.
If the Modbus protocol is used, data access to the BC8150 flag area is recommended. This area can be read
and or written to without triggering the watchdog. The ADS protocol can access all data. The whole process
image can be accessed via port 800, and the process image from address 1000 via port 300. If port address
800 is used, the data are only available for read access. If the serial ADS is used, it is recommended to
access the flag area that can be reached via port 800 and IndexGroup 0x4020.
Addressing of the connected Bus Terminals
The default setting is for all the connected Bus Terminals to be assigned to the local process image.
Mapping within the Bus Terminal Controller is carried out according to the following rule:
First all the complex Bus Terminals, in the sequence they are physically inserted, followed by the digital Bus
Terminals which are filled to a byte. The default mapping of the complex Bus Terminals is:
• complete evaluation
• Intel format
• Word Alignment
Example structure
Bus Terminal Controller: 1 x BX/BCxx50
Position 1: 1 x KL1012
Position 2: 1 x KL1104
Position 3: 1 x KL2012
Position 4: 1 x KL2034
Position 5: 1 x KL1501
Position 6: 1 x KL3002
Position 7: 1 x KL4002
Position 8: 1 x KL6001
Position 9: 1 x KL9010
Process image
Bus Terminal
Position
Input image
Output image
KL1501
5
%IB0...%IB5
%QB0...%QB5
KL3002
6
%IB6...%IB13
%QB6...%QB13
KL4002
7
%IB14...%IB21
%QB14...%QB21
KL6001
8
%IB22...%IB29
%QB22...%QB29
KL1012
1
%IX30.0..30.1
-
KL1104
2
%IX30.1..30.5
-
KL2012
3
-
%QX30.0..30.1
KL2034
4
-
%QX30.2..30.5
KL9010
9
-
-
Summary of Contents for BC8050
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