BECKHOFF BK7000 User Manual

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ControlNet Coupler

BK7000

Version: 0.9.1

Last change: 2006-10-30

Contents

1. Foreword	2
Notes on the documentation	2
Liability Conditions	2
Delivery conditions	2
Copyright	2
Safety Instructions	3
State at Delivery	3
Description of safety symbols	3
2. Basic information	4
The Beckhoff bus terminal system	4
The interfaces	6
Power supply	6
Power supply to the power contacts	6
Power contacts	6
Fieldbus connection	6
Configuration interface	7
K-bus contacts	7
Supply isolation	7
The operating modes	8
Mechanical design	9
Electrical data	11
The peripheral data in the process image	12
Starting operation and diagnostics	14
Run times and reaction times	16
3. ControlNet coupler BK7000 in the ControlNet	17
Introducing the system	17
The transfer medium: plugs and cables	18
Configuring the master	18
Config data of the Assembly object	20
Calculating rules for terminal bus input and output data sizes	21
Configuration with RS Networx 1.06	22
Save the configuration	23
Configuration with RS Networx 1.03	23
4. Appendix	24
Sample arrangement of a process image in the bus coupler	24
Representation of analog signals in the process image	26
5. Support and Service	28
Beckhoff's branch offices and representatives	28
Beckhoff Headquarters	28

BK 7000

Foreword

Notes on the documentation

This description is only intended for the use of trained specialists in control and automation engineering who are familiar with the applicable national standards. It is essential that the following notes and explanations are followed when installing and commissioning these components.

Liability Conditions

The responsible staff must ensure that the application or use of the products described satisfy all the requirements for safety, including all the relevant laws, regulations, guidelines and standards.

The documentation has been prepared with care. The products described are, however, constantly under development. For that reason the documentation is not in every case checked for consistency with performance data, standards or other characteristics. None of the statements of this manual represents a guarantee (Garantie) in the meaning of § 443 BGB of the German Civil Code or a statement about the contractually expected fitness for a particular purpose in the meaning of § 434 par. 1 sentence 1 BGB. In the event that it contains technical or editorial errors, we retain the right to make alterations at any time and without warning. No claims for the modification of products that have already been supplied may be made on the basis of the data, diagrams and descriptions in this documentation.

Delivery conditions

In addition, the general delivery conditions of the company Beckhoff Automation GmbH apply.

BK 7000

Foreword

Safety Instructions

State at Delivery

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. They are intended to alert the reader to the associated safety instructions..

This symbol is intended to highlight risks for the life or health of personnel.

Danger

This symbol is intended to highlight risks for equipment, materials or the environ-

ment.

Attention

This symbol indicates information that contributes to better understanding.

i Note

BK 7000

Basic information

	The Beckhoff bus terminal system
	The bus terminal system is the universal connecting link between a field-
	bus system and the sensor/actor level. A unit consists of a bus coupler,
Up to 64 bus terminals	which is the interface to the fieldbus, and up to 64 electronic terminals, of
	which the last is an end terminal. Terminals, each with two I/O channels,
each with 2 I/O channels	are available for any form of technical signal and can be combined as de-
for any form of signal	sired. The various types of terminal are all constructed in the same way, so
	that the planning costs are kept extremely low. The height and depth of the
	construction are calculated for compact terminal cabinets.
	Fieldbus technology makes it possible to use compact control architec-
Decentralized wiring of the	tures. The I/O level does not need to be taken right up to the control unit.
I/O level	Sensors and actors can be connected decentrally with minimal lengths of
	cable. You can position the control unit at any convenient location in the
IPC as control unit	installation. Using an industrial PC as control unit makes it possible to im-
	plement the operating and monitoring element as part of the control hard-
	ware, so the control unit can be located on an operating desk, control point
	or similar. The bus terminals constitute the decentralized input/output level
	of the control unit in the switch cabinet and its subordinate terminal cabi-
	nets. As well as the sensor/actor level, the power unit of the equipment is
	also controlled via the bus system. The bus terminal replaces a conven-
	tional terminal as the cabling level in the switch cabinet; the switch cabinet
	can be made smaller.
Bus couplers for all current	The Beckhoff bus terminal system combines the advantages of a bus sys-
bus systems	tem with the functionality of compact terminals. Bus terminals can be used
	on all current bus systems and serve to reduce the diversity of parts in the
	control unit, while behaving like the conventional standard units for the
	relevant bus system and supporting the entire range of functionality of the
	bus system.
Standard C rail assembly	The simple and compact assembly on a standard C rail, and the direct
	cabling of actors and sensors without cross connections between the ter-
	minals, serve to standardize the installation, as does the uniformly de-
	signed labeling.
	The small size and great flexibility of the bus terminal system mean that
	you can use it anywhere that you could use a terminal and use any type of
	connection – analog, digital, serial or direct sensors.
Modularity	The modular construction of the terminal row, using bus terminals with
	various functions, limits the number of unused channels to at most one per
	function. Two channels to a terminal is the optimum solution for the number
	of unused channels and the cost per channel. The possibility of using
Display of channel status	power input terminals to provide separate power supplies also helps to
	minimize the number of unused channels.
	The integrated light-emitting diodes close to the sensor/actor indicate the
	status of each channel.
The K-bus	The K-bus is the path taken by data within the terminal row. The bus cou-
	pler carries the K bus through all the terminals by means of six contacts on
End terminal	the side walls of the terminals, and the end terminal terminates the K bus.
	The user does not need to know anything about the function of the K bus
	or the internal operation of terminals and bus couplers. There are numer-
	ous software tools available which provide for convenient planning, con-
	figuration and operation.
BK 7000	4

Basic information

Power input terminals Three power contacts pass the operating power to the following terminals. for You can use power input terminals to subdivide the terminal row as desired separately powered groups into groups, each with a separate power supply. These power input terminals are not taken into account for addressing the terminals, you can insert

them at any position along the terminal row.

You can install up to 64 terminals on a terminal row, including power input terminals and the end terminal.

The principle of the bus terminal

ControlNet	Powersupply	Potential
bus coupler	for the	input	Bus end
BK7000	bus coupler	terminal	terminal
		Terminal bus

4	5	6
3		7
2		8
1	0	9
	0
x10
4	5	6
3		7
2		8
1	0	9
	0

ControlNet




BECKHOFF		BK7000

24V 0V

+ +

PE PE

				Power	Potential


				contacts	isolation

Bus couplers for various You can use a variety of bus couplers to attach the electronic terminal row fieldbus systems quickly and easily to the various fieldbus systems, and you can also subsequently convert to a different fieldbus system. The bus coupler deals with all the necessary monitoring and control tasks for operating the attached bus terminals, indeed all the operation and configuration of the bus terminals is carried out via the bus coupler. The fieldbus, K bus and I/O level are

electrically isolated.

If the exchange of data across the fieldbus is temporarily interrupted, logic states are preserved, digital outputs are cleared and analog outputs revert to a reset value which can be individually configured for each output when the equipment is set up.

BK 7000

Basic information

The interfaces

There are six ways of making a connection to a ControlNet bus coupler. These interfaces are designed as plug connections and spring terminals.

The ControlNet coupler

BK7000

Field Bus

Connector A

Field Bus

Connector B

Address

Selector

Network Access

Port (NAP)

Configuration

Interface

4	5	6
3		7
2		8
1	0	9
	0

x10

4	5	6
3		7
2		8

1	0	9
	0

ControlNet





BECKHOFF		BK7000

X0	00	Power LEDs
		Power LEDs
		Bus coupler / power contacts
24V	0V	Terminal bus

	Power supply bus coupler
+ +	24 V DC / GND

Input

power contacts

PE PE

power contacts

	Power supply
24 V DC on the topmost	The bus couplers need an operating power of 24 V DC which is connected
terminals	via the topmost spring terminals, labeled "24 V” and "0 V”. This power sup-
	ply serves not only the electronic components of the bus coupler but (via
	the K bus) also the bus terminals. The power supply of the bus coupler
	circuitry and that of the K-bus (Terminal bus) are electrically isolated from
	the voltage of the field level.

	Power supply to the power contacts
Lower 3 terminal pairs for	The six lower connections with spring terminals can be used to supply
power input	power to the peripherals. The spring terminals are connected in pairs to the
	power contacts. The power supply to the power contacts has no connec-
	tion to the power supply of the bus couplers. The power input is designed
maximum 24 V	to permit voltages up to 24 V. The pair-wise arrangement and the electrical
	connection between the feed terminal contacts makes it possible to loop
	through the wires connecting to different terminal points. The load on the
maximum 10 A	power contact may not continuously exceed 10 A. The current capacity
	between two spring terminals is the same as the capacity of the connecting
	wires.

Power contacts

On the right-hand side face of the bus coupler are three spring contacts Spring contacts at the side which are the power connections. The spring contacts are recessed in slots to prevent them from being touched. When a bus terminal is connected, the blade contacts on the left-hand side of the bus terminal are connected to the spring contacts. The slot and key guides at the top and bottom of the bus couplers and bus terminals ensure reliable location of the power con-

tacts.

Control-Net connectors

BK 7000

Fieldbus connection

On the left-hand side there are two ControlNet connectors A and B and a NAP-Port. You will find a detailed description of the fieldbus interfaces in another part of this manual (In the chapter "The transfer medium: plugs and cables”).

Basic information

Configuration interface

On the lower part of the front face you will find the standard bus couplers

	Serial interface under the which are fitted with an RS232 interface. The miniature plug can be at-
	front flap	tached to a PC by means of a connection cable and the configuration soft-
	front flap	ware KS2000. This interface enables you to configure the analog channels.

		You can also access the functionality of the configuration interface via the
		fieldbus by means of the PLC interface communications.

6 contacts at the side

3 supply groups: fieldbus

K-bus peripheral level

K-bus contacts

The connections between the bus coupler and the bus terminals are effected by gold contacts at the right-hand side of the bus coupler. When the bus terminals are plugged together, these gold contacts automatically complete the connection to the bus terminals. The K bus is responsible for the power supply to the electronic components of the K bus in the bus terminals, and for the exchange of data between the bus coupler and the bus terminals. Part of the data exchange takes place via a ring structure within the K bus. Disengaging the K bus, for example by pulling on one the bus terminals, will break this circuit so that data can no longer be exchanged. However, there are mechanisms in place which enable the bus coupler to locate the interruption and report it.

Supply isolation

The bus couplers operate with three independent supplies. The input power supplies the electrically isolated K-bus circuitry in the bus coupler and the K-bus itself. The power supply is also used to generate the operating power for the fieldbus.

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

BK 7000

Basic information

The operating modes

When it is first switched on the bus coupler carries out a self-test to check the functions of its components and the communications of the K bus, and while this is going on the red I/O LED will flash. When the self-test has been completed successfully, the bus coupler will begin to test the attached bus terminals (the "bus terminal test”) and read in the configuration from which it constructs an internal structure list, which is not accessible from outside. If an error occurs the bus coupler will enter the operating mode "STOP”. If the start-up sequence is completed without errors the bus coupler will enter the mode "fieldbus start”.

Start-up behavior of the bus coupler

The bus coupler reports the error by means of the IO-ERR-LED. Clearing the error returns the bus coupler to its normal operating mode.

BK 7000

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