BECKHOFF C1220 User Manual

Beckhoff Lightbus - PC
interface card
C1220

Technical hardware description

Version 4.0

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

Contents 2

Contents

1. Beckhoff Lightbus System Description 3

2. Hardware description of functions 6

3. Software description of functions 7

General 7
Description of the communication channels 9
Test and analysis functions 11

Fibre-optic reset 11
Code word 12
Software version 12
Evaluation of Parity Errors 12
Fibre-optic attenuation test 13
Count peripheral modules 14
Test peripheral module addresses 14
Continuous sending 14
Software-RESET 15
Fibre-optic fracture point test 15
Invalid function selection 15

Configuration 16

Reinitializing communication management 16
CDL communication 16

Freely programmable communication 18

Cyclic communication 19
Transmitting the interrupt mask 19

String Communication 21

General 21
String structure 21
Initialisation of string communication 22
Registration of a string slave 23
Structure of the buffer for string communication 24
Sending a string 24
Receiving a string 24
Slave to slave string communication 24
Register communication 24

Process image control functions 25

C1220 II/O Error Counter 27

4. Technical Data 28

5. Installation notes 29

Jumper configuration 29
Status display 30
Installation in the PC 30

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

&RQWURO

3 Beckhoff Lightbus System Description

Beckhoff Lightbus System Description

The Beckhoff Lightbus c onsists of an int elligent central m odule and a field
bus based on fibre-optic conductor.

Beckhoff Lightbus

+RVW V\VWHP

$GUHVVHV

'DWD

&HQWUDO PRGXOH

7HUPLQDOURZ

,2PRGXOH

%HFNKRII /LJKWEXV

7HUPLQDOURZ

,2PRGXOH

ILEH U RSWLF ULQJ

,2PRGXOH

The Beckhoff Lightb us is coupled to the host Syst em via a DPRAM, thus
guaranteeing fast and convenient communication.

Bus couplers for Beckhoff Bus terminals and diverse I/O modules are
available for processing the proces s image. M odules and bus couplers are
linked to one anoth er in a ring structure. Thanks to the use of fibre-optic
conductor, interferenc e sensitivity is low and the data tra nsfer rate of 2.5
Mbaud is high. Errors occ urring in the fibre-optic ring ar e detected by the
central module and are reported to the host system. Implemented ring
diagnostics functions enable swift error detection and remedying.

7HUPLQDOURZ

A communication protocol optimized for speed and simplicity has been
defined for data transfer between the central module and I/O modules.
Below, this communication protocol is also referred to as a telegram.

Communication on th e f ibre- o ptic r i ng is contr o ll ed by the central m odule. It
sends telegrams which pas s through the individual modules an d terminal
rows in the fibre-optic ring, and which are ultimately received again and
checked.

A telegram consists of the telegram frame and contents.

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

Beckhoff Lightbus System Description 4

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 t he so called address f ield. 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

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

0 1 0 0 ADDRESS

CHECK AND
COUNT
COMMAND

1 0 0 1 LOW INTENSITY

COMMAND

1 0 1 1 BROADCAST

The addressed module accepts the contents of
D0 as the module address and sets D0 = 0.

BK2000
Every module that is passed through increments

the contents of D0 by 1. The addressed module
transfers the contents from D0 to D3.

The addressed module reduces the send
intensity by 20%.

A special type of telegram for bus coupler
BK2000

The bytes D0 - D3 conta in the actual user information. Processi ng 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 check sum. A Hamming distance of d=3 is ac hieved
with a length of the contents amounting to 50 bits.

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

5 Beckhoff Lightbus System Description

The Beckhoff Lightb us consists of a p hysical ring whic h can be split into 8
logical rings for processing th e process im age. A log ical ring onl y operates
on selected modules and term inal rows that are defined by means of so
called Communication D escripti on Lists ( CDLs). Tr ansfer of the CDLs fr om
the host system to the central module will be discussed in further detail
later.

The process im age is made available to the host system via the DPRAM.
The DPRAM is split into three areas:-

- Data: Input, output and flags

- Communication: Initialization, test, analysis and configuration of the
Beckhoff Lightbus

- Process control: Updating of process images

To this end, the central module requires a 4 k byte area in the address
space of the host system.

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

/LJKWEXV/&$

Hardware description of functions 6

Hardware description of functions

Lightbus PC interface card
C1220

PC control

&
%HFNKRII/LJKWEXV3&,QWHUIDFH

-

-

The Lightbus - PC interface C1220 is an intelligent Lightbus central
module.

As a plug-in ISA bus PC board, the C1220 link s the Beckhoff Lightbus to
the PC as the host system and is therefore a n impor tant component of the
PC control concept.

&

7;

5;

-

-

With the aid of the C1220 , fast processing of a process im age defined by
the sensors / actuators of the Beckhoff Lightbus is enabled.

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

7 Software description of functions

Software description of functions

General

Memory breakdown of the
interface

Address area Function

0x0000 - 0x0BFF

0x0C00 - 0x0CFF

0x0D00 - 0x0DFF

0x0E00 - 0x0FEF
0x0FF0 - 0x0FFF

Data area
(Inputs, outputs, flags)
3 kbytes

Handshake channel 0: PC -> C1220
(configuration, test, analyse)

Handshake channel 1: C1220 -> PC
(configuration, test, analyse)

reserved
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 do ing so, the inputs / outp uts 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 b it 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.

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

Software description of functions 8

Beckhoff Lightbus - PC interface card C1220

Eiserstraße 5 / D-33415 Verl / Telefon [phone] / Telefax 05246/963-149

9 Software description of functions

Description of the communication channels

Two channels are config ured for communic ation between the PC bus a nd
C1220. Each channel embraces 255 bytes. The PC writes the data
required for requesting the required function into the channel 0 and then
outputs a DV (Data Val id). After acceptance of the data, the C122 0 module

outputs the ‘Quit’ signal. The PC withdraws the ‘DV’ and a new
communication can be commenced as soon as the ‘Quit' signal is 0.

Channel 0 from the PC b us to the C1220 provides the address area from
0xC01 to 0xCFF for the data. DV is the MSB of the ad dr es s 0x C00. 'Qu it' is
the second highest bit of the address 0xD00.

Communication channel 0:

Communication channel 1:

Addresses of the

Komunikationskanäle

Byte 0
0xC00

Byte 1 ................ Byte 254 Byte 255

0xCFF

Channel 1 from the C1220 module to the PC bus provides the address
area from 0xD01 to 0xDFF for the data. DV is the MSB of the address
0xD00. 'Quit' is the second highest bit of the address 0xC00.

Byte 0
0xD00

Address Address bits Contents

0xC00

0xC00

0xC01
0xC02

0xC03

0xCnn

0xCFF

0xD00

0xD00

0xD01

Byte 1 ................ Byte 254 Byte 255

7 6 5 4 3 2 1 0
1 0 0 0 0 0 0 0 ’Data Valid’ for

Channel 0
(in the case of PC -> C1220 data
transfer)

0 1 0 0 0 0 0 0 ’Quit’ for Channel 1

(in the case of C1220 -> PC data
transfer)

Length (von 2 bis 0xFE)
Functionsnummer

(1 bis 0xFE)
Argument 0

..

..

1 x 0 0 0 0 0 0 ’Data Valid’ for

x 1 0 0 0 0 0 0 ’Quit’ for Channel 0

..
Argument n
..
..

Channel 1
(in the case of C1220 -> PC data
transfer)

(in the case of PC -> C1220 data
transfer)

Length (from 2 to 0xFE)

0xDFF

Beckhoff Lightbus - PC interface card C1220