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Beckhoff Lightbus System Description 4

Beckhoff Lightbus - PC interface card C1220

The telegram frame is required for serial, asynchronous data

communication and consists of 1 start bit, 6 CRC check bits and 2 stop

bits. The telegram frame is generated and checked by the hardware.

Software support is not necessary.

The telegram contents are essentially based on a byte organization.

AD0 - AD7 constitute the so called address field. Up to 254 modules and

terminal rows can be addressed via this address field (the addresses 0x00

and 0x0ff are reserved).

CR0 - CR3 defines the telegram type. The following functions can be

defined in the telegram:

CR3 CR2 CR1 CR0 Function Description

0 0 0 0 READ The addressed module inserts the input

information in the data fields D0 - D3.

0 0 0 1 READ/WRITE The addressed module inserts the input

information in the data fields D0 - D3 and

accepts the output information.

0 0 1 0 ADDRESS

INITIALIZATION

The addressed module accepts the contents of

D0 as the module address and sets D0 = 0.

0 0 1 1 RAM A special type of telegram for bus coupler

BK2000

0 1 0 0 ADDRESS

CHECK AND

COUNT

COMMAND

Every module that is passed through increments

the contents of D0 by 1. The addressed module

transfers the contents from D0 to D3.

1 0 0 1 LOW INTENSITY

COMMAND

The addressed module reduces the send

intensity by 20%.

1 0 1 1 BROADCAST

A special type of telegram for bus coupler

BK2000

The bytes D0 - D3 contain the actual user information. Processing of this

user information data is defined by the control field.

The last byte in the telegram contains 2 reserve bits and 6 bits for

generation of a CRC checksum. A Hamming distance of d=3 is achieved

with a length of the contents amounting to 50 bits.

1 2 3 4 5 6 7 8 9 ... 29 30

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