Summary of Contents for Beckhoff BK8000
- Page 1 Bus coupler with RS485 interface BK8000 Technical Documentation Version 1.2 2006-10-30...
-
Page 2: Table Of Contents
The operating modes of the bus coupler Mechanical construction Electrical data The peripheral data in the process image Starting operation and diagnostics 3. RS 485 Coupler BK8000 System presentation The media: plugs and cable Data communication 4. Appendix Sample arrangement of a process image in the bus coupler Representation of analog signals in the process image 5. -
Page 3: Foreword
In addition, the general delivery conditions of the company Beckhoff Automation GmbH apply. Copyright © This documentation is copyrighted. Any reproduction or third party use of this publication, whether in whole or in part, without the written permission of Beckhoff Automation GmbH, is forbidden. BK8000... -
Page 4: Safety Instructions
All the components are supplied in particular hardware and software configurations appropriate for the application. Modifications to hardware or software configurations other than those described in the documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH. Description of safety symbols The following safety symbols are used in this documentation. -
Page 5: Basic Information
Bus couplers for all current The Beckhoff bus terminal system combines the advantages of a bus bus systems system with the functionality of compact terminals. Bus terminals can be... - Page 6 Power supply RS485 Potential for the bus coupler input The principle of the bus Bus end terminal bus coupler BK8000 terminal terminal K-Bus RS 485 PE PE Power Potential contacts isolation Bus couplers for various...
-
Page 7: The Interfaces
There are six ways of making a connection to a bus coupler. These interfaces are designed as plug connections and spring terminals. RS 485 The RS485 coupler Power LEDs BK8000 Bus coupler/power contacts RS 485 Power supply bus coupler 24 V DC/GND... -
Page 8: Rs 485 Connection
Note: All the bus terminals are electrically isolated from the K bus, so that the K-bus is completely electrically isolated. Bus coupler Bus terminals Setting up the power levels in the bus terminal system Terminal bus Field bus Periphery level 24 V DC BK8000... -
Page 9: The Operating Modes Of The Bus Coupler
"fieldbus start”. Start-up behavior of the bus coupler The bus coupler reports the error to the master by means of the Profibus diagnostics. Clearing the error returns the bus coupler to its normal operating mode. BK8000... -
Page 10: Mechanical Construction
Basic information Mechanical construction The Beckhoff bus terminal system is remarkable for its compact construction and high degree of modularity. When you design the installation you will need to plan for one bus coupler and some number of bus terminals. The dimensions of the bus couplers do not depend on the fieldbus system. -
Page 11: Electrical Data
38400 baud. Addresses from 0 to 99 can be set by means of two address selectors on the coupler. The following table provides an overview of all data. Technical data BK8000 Voltage supply 24 V DC (20 ...29 V DC) Input current 70 mA + (total K-Bus current)/4 500 mA max. -
Page 12: The Peripheral Data In The Process Image
Using a special power supply terminal (KL9400), power can be fed back into the K-bus at any chosen point. If you wish to use a power supply terminal, please contact Beckhoff’s technical support. The peripheral data in the process image... - Page 13 The bus coupler automatically assigns the I/Os of the terminals to the process image in the RS485 communication protocol. These allocations process image in the application software can be modified with the Beckhoff KS2000 configuration software. Various mapping parameters (e.g. Motorola/Intel format) can be set in the bus coupler. Data consistency Data which contains no contradictions is said to be consistent.
-
Page 14: Starting Operation And Diagnostics
The bus coupler has two groups of LEDs to provide a status display. The top group of 4 LEDs indicates the status of the respective field bus. In the case of the BK8000, various data transfer communication states are displayed. - Page 15 That is to say, the red I/O LED goes off after an error-free startup without the green I/O LED having to light up. Then, the green I/O LED does not light up until data transfer is commenced (see above). BK8000...
-
Page 16: Rs 485 Coupler Bk8000
System presentation General The BK8000 bus coupler enables the establishment of a simple data bus working on a RS 485 transfer basis. By using repeater, up to 99 bus coupler can be connected to a bus. The RS 485 coupler is usually connected to the PC via the serial interface. -
Page 17: The Media: Plugs And Cable
8: RxD/TxD- N 3: RxD/TxD- P A linear bus can be set-up with the BK8000 Bus Couplers. In order to prevent reflections during data transmission it is necessary to terminate the line ends of the bus cable with resistors (120 ). -
Page 18: Data Communication
E 1). The baud rate is set by default to 38400 baud. As already mentioned, the station addresses are set by means of the two rotary switches on the bus coupler. When the address 0 is set, the BK8000 operates as the master and the slave bus coupler must be assigned the address 1. - Page 19 Status.7 Example The BK8000 is connected to a PC via the RS 485 interface. The address 5 has been set on the coupler.The coupler has been expanded with the following terminals (the mapped bits in the process image of the bus...
- Page 20 RS 485 Coupler BK8000 The following table provides a list of the plugged-in terminals in their physical arrangement on the coupler with the affiliated mapped bits in the bus coupler's process image. Position Function module on the rail POS00 BK8000...
- Page 21 '0' and the analog terminals assume a user-defined status (by default, they are set to logical '0'. The input data is frozen at the last value. The bus coupler's watchdog time can be set using the Beckhoff KS2000 configuration software.
-
Page 22: Appendix
0, 1 none O0, O1 POS11 2, 3 none O2, O3 POS11 4, 5 none O4, O5 POS12 6, 7, none O6, O7 POS12 8, 9 none O8, O9 POS20 10, 11 none O10, O11 POS20 BK8000... - Page 23 If a byte is not fully used, for example O13, the bus coupler pads its remaining bits with zeroes. Overview of the distribution of the process image in the bus coupler: Output data in the bus coupler byte-oriented data bit-oriented data BK8000...
-
Page 24: Representation Of Analog Signals In The Process Image
0 = READ, 1 = WRITE BIT 5 for accessing Register address, MSB the register model BIT 4 Register address BIT 3 Register address BIT 2 Register address BIT 1 Register address BIT 0 Register address, LSB BK8000... - Page 25 KS2000 software is needed. The meanings of the registers and of the status bytes are explained in the bus terminals' corresponding data sheets. The structure of the module is identical for all bus terminals featuring more extensive signal processing. BK8000...
-
Page 26: Support And Service
Please contact your Beckhoff branch office or representative for local support and service on Beckhoff products! The addresses of Beckhoff's branch offices and representatives round the world can be found on her internet pages: http://www.beckhoff.com You will also find further documentation for Beckhoff components there.