BECKHOFF C1220 - Manual (Page 7)

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7 Software description of functions
Beckhoff Lightbus - PC interface card C1220
Software description of functions
General
Memory breakdown of the Address area Function
interface 0x0000 - 0x0BFF Data area
(Inputs, outputs, flags)
3 kbytes
0x0C00 - 0x0CFF Handshake channel 0: PC -> C1220
(configuration, test, analyse)
0x0D00 - 0x0DFF Handshake channel 1: C1220 -> PC
(configuration, test, analyse)
0x0E00 - 0x0FEF reserved
0x0FF0 - 0x0FFF GCB (General control block)
The interface between the PC bus and the C1220 module enables the
following functions:
- Data transfer of the process image
- Test and analysis functions for the II/O system
- Configuration
- Control of process images
By way of the communication channels, the Beckhoff Lightbus can be
configured by means of four functions. In doing so, the inputs / outputs of
the decentralized I/O modules are assigned to the addresses in the
DPRAM. A total of nine further functions can also be requested via the
communication channels for test and analysis functions.
The data areas for the CDLs are located in the bottom 3 kbyte area that the
C1220 module occupies in the address space. The request to update the
process image is realized by setting a bit in the request mask of the GCB
(General Control Block). The ready message for this request is obtained
from the corresponding bit in the ready mask of the GCB.