Beckhoff BC9100 User Manual

Programming
BC9000 and BC9100 41Version: 4.0.0
Example 1 (default setting)
All the connected Bus Terminals are assigned to the local PLC. The 16bytes of PLC variables are available
for communication with the ModbusTCP master. PLC variables are part of the byte-oriented data packets,
and can therefore not be accessed by the digital Modbus functions, even though the variables are digitally
mapped in the BCxxxx. Difficulties are most often associated with whether signals are considered as inputs
or outputs. PLC variables that are outputs for the BCxxxx are inputs for the Modbus master, and vice versa.
The default setting can be changed with the KS2000 configuration software (register description table 1
[}75]).
Local PLC inputs Local PLC outputs
Modbus
function
Modbus
address/offset
Local Variables Modbus
function
Modbus
address/offset
Local Variables
3 read 0x800…807 %IB128...%IB143 3 read 0x000...007 %QB128...%QB143
4 read 0x000...007 %QB128...%QB143
6 write 0x800...807 %IB128...%IB143
16 write 0x800...807 %IB128...%IB143
23 read/write 0x800...807 %IB128...%IB143 23 read/write 0x000..007 %QB128...%QB143
Example 2
In addition, the Bus Terminals can be assigned once to the BC or to the local PLC. This creates additional
complications in the process image. The rule governing how the process image is assembled is, however,
simple.
• Entry of all the byte-oriented Bus Terminals (such as the analog Bus Terminals)
• Entry of all the digital Bus Terminals (rounded up to 16bits)
• Entry of the PLC variables
6.7.3 ADS Process Image
16bytes input and output are assigned to the fieldbus by default in all the BCxxxx devices. These variables
are known as PLC variables, and are located, under the BCxxxx default setting, starting from address 128 in
the process image. The setting can be made with the KS2000 configuration software, or, for some BCs that
support ADS, can be changed by means of start-up parameters.
6.8 Program transfer
6.8.1 Program transfer via the serial interface
The Bus Terminal Controller is programmed using TwinCAT.
The program can also be downloaded to the Bus Terminal Controller via the RS232 interface of the PC. A
special cable, which is included in the scope of delivery of the KS2000 configuration software, should be
used for this purpose.
To this end, select the serial interface in TwinCAT PLC Control.

Beckhoff BC9100 Specifications

General

Brand	Beckhoff
Model	BC9100
Category	Controller
Language	English