BECKHOFF BK7000 User Manual
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
Contents
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
1 BK 7000
Foreword
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.
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.
BK 7000 2
i
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-
Attention
Note
ment.
This symbol indicates information that contributes to better understanding.
3 BK 7000
Basic information
Basic information
Up to 64 bus terminals
each with 2 I/O channels
for any form of signal
Decentralized wiring of the
I/O level
IPC as control unit
Bus couplers for all current
bus systems
Standard C rail assembly
Modularity
Display of channel status
The K-bus
End terminal
The Beckhoff bus terminal system
The bus terminal system is the universal connecting link between a fieldbus system and the sensor/actor level. A unit consists of a bus coupler,
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,
are available for any form of technical signal and can be combined as desired. 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 architectures. The I/O level does not need to be taken right up to the control unit.
Sensors and actors can be connected decentrally with minimal lengths of
cable. You can position the control unit at any convenient location in the
installation. Using an industrial PC as control unit makes it possible to implement the operating and monitoring element as part of the control hardware, 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 cabinets. 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 conventional terminal as the cabling level in the switch cabinet; the switch cabinet
can be made smaller.
The Beckhoff bus terminal system combines the advantages of a bus system 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.
The simple and compact assembly on a standard C rail, and the direct
cabling of actors and sensors without cross connections between the terminals, serve to standardize the installation, as does the uniformly designed 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.
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
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 is the path taken by data within the terminal row. The bus coupler carries the K bus through all the terminals by means of six contacts on
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 numerous software tools available which provide for convenient planning, configuration and operation.
BK 7000 4
isolation
contacts
ControlNet
Powersupply
Potential
1
1
Basic information
Power input terminals
for
separately powered groups
The principle of the bus
terminal
Three power contacts pass the operating power to the following terminals.
You can use power input terminals to subdivide the terminal row as desired
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.
bus coupler for the input Bus end
BK7000 bus coupler terminal
terminal
Terminal bus
ControlNet
x1
5
6
4
7
3
8
2
9
0
x10
5
6
4
7
3
8
2
9
0
00X0
A
B
24V
0V
+ +
BK7000
BECKHOFF
PE
PE
Bus couplers for various
fieldbus systems
PotentialPower
You can use a variety of bus couplers to attach the electronic terminal row
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.
5 BK 7000
Basic information
Bus coupler / power contacts
+
PE
PE
8
7
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
ControlNet
A
B
00X0
24V
0V
Power LEDs
Terminal bus
Field Bus
Connector B
Address
Selector
Network Access
+
x1
5
6
4
7
3
8
2
9
1
0
x10
5
6
4
3
2
9
1
0
BK7000
BECKHOFF
Power supply bus coupler
24 V DC / GND
Input
power contacts
Port (NAP)
Configuration
Interface
power contacts
24 V DC on the topmost
terminals
Power supply
The bus couplers need an operating power of 24 V DC which is connected
via the topmost spring terminals, labeled "24 V” and "0 V”. This power supply 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.
Lower 3 terminal pairs for
power input
maximum 24 V
maximum 10 A
Power supply to the power contacts
The six lower connections with spring terminals can be used to supply
power to the peripherals. The spring terminals are connected in pairs to the
power contacts. The power supply to the power contacts has no connection to the power supply of the bus couplers. The power input is designed
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
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.
Spring contacts at the side
Power contacts
On the right-hand side face of the bus coupler are three spring contacts
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 contacts.
Control-Net connectors
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”).
BK 7000 6
Periphery level
Bus terminals
Bus coupler
24 V DC
Serial interface under the
front flap
6 contacts at the side
3 supply groups:
fieldbus
K-bus
peripheral level
Setting up the power levels
in the bus terminal system
Configuration interface
On the lower part of the front face you will find the standard bus couplers
which are fitted with an RS232 interface. The miniature plug can be attached to a PC by means of a connection cable and the configuration software 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.
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.
Basic information
Terminal bus
Field bus
7 BK 7000
Basic information
Start-up behavior of the bus
coupler
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”.
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 8
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