Beckhoff Buscontroller BC / BK

Beckhoff Buscontroller BC / BK

In zenon a special driver exists for the Beckhoff bus controller. The BeckhBC32 driver.

Unlike a TwinCAT softplc on a PC or Beckhoff CX devices, the Beckhoff buscontroller do not support symbolic communication.

In order to not only read inputs and write outputs, but also read / write program variables in the buscontroller, these variables must also be declared with an offset in TwinCAT.

The variables can be imported and created automatically in zenon by using the symbol file ".tpy", which is generated by TwinCAT PLC control.

This shows an example of the variable declaration in TwinCAT:

VAR

BC1_REAL AT %MB0: REAL;
BC1_DINT AT %MB4: DINT;
BC1_UDINT AT %MB8:UDINT;
BC1_INT AT %MB12:INT;
BC1_UINT AT %MB14:UINT;
BC1_STRING AT %MB18:STRING(64);
BC1_SINT AT %MB16:SINT;
BC1_USINT AT %MB17:USINT;
BC1_BOOL16_0 AT %MX16.0:BOOL;

BC1_OUT AT %QX0.0:BOOL;
BC1_OUT2_0 AT %QX2.0:BOOL;

BC1_IN AT %IX0.0:BOOL;
HUGO1 AT %MB128:HUGO;

END_VAR

TYPE HUGO :
STRUCT
HUGO_COLOURS : ARRAY [1..5] OF BOOL;
HUGO_VALUE : INT;
END_STRUCT
END_TYPE

This is a migrated post! Originally posted on 24.02.2009 by user markclemens. Please be aware that information can be outdated.