Beckhoff C1220 Instrukcja Użytkownika Pobierz pdf (Strona 19)

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19 Software description of functions

Beckhoff Lightbus - PC interface card C1220

Example:

Initialization of communication 3 as free communication with 2 telegrams.

The base address for the output area is 0x400, and the base address for

the input area is 0x210.

ArgumentChannel Length Function blank

0 1 2 3

Request

09 0x0b 00 03 02 00,04 10,02

Channel Length Function Argument 0 Comment

03 0x0b 00 ok

By means of this structure it is also possible to modify the module address

and the control byte during the run time. One restriction here, however, is

that this must not take place while communication is active.

Cyclic communication

With the function 0x12, it is possible to trigger communication cyclically by

the central module. In doing so, the otherwise necessary Handshake by

way of the GCB is dropped.

Channel Length Function Argument 1 Argument2

Request

04 0x12 k pan

Channel Length Function Argument 0 Comment

03 0x12 00 ok

03 0x12 01 Error

where:

pan

Process image number

Status

0 = Communication passive

1 = Communication active

In this mode of communication, however, only byte-oriented I/O functions

should be executed because the timing behavior is no longer deterministic.

Transmitting the interrupt mask

The module C1220 features 4 interrupt channels through which the

address-independent interrupts are transferred to the PC. Transfer to the

PC is realized via the GCB.

The address-independent interrupts can be generated by the peripheral

modules. In doing so, they are inserted in the interrupt field of the control

byte.

The function 0x0f is used to communicate to the module C1220 which

interrupt channels are to be activated and which interrupt criteria are to

lead to interrupt transmission to the PC.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 29 30

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