BECKHOFF BC3100 User Manual
2006
-
11
-
06
PROFIBUS
Bus Terminal Controller
BC3100
Technical Hardware Documentation
Version 2.1
Foreword
Contents
Foreword 3
Notes on the documentation 3
Safety Instructions 4
Basic information 5
The Beckhoff bus terminal system 5
The interfaces 7
The operating modes of the bus coupler 9
Mechanical construction 10
Electrical data 12
The peripheral data in the process image 13
Commissioning and diagnostics 15
Run and reaction times 17
Memory requirement 18
PROFIBUS-DP basics 19
Introducing the system 19
PROFIBUS DP 19
The transfer medium: plugs and cables 24
Configuration of the masters 26
PROFIBUS bus terminal controller BC3100 29
Parameterization 29
Configuration 32
Auto-configuration 32
Diagnostics 35
Data exchange 37
Other DP services 39
Acyclic DPV1 services 39
Annex 42
Example: a process image in the bus terminal controller 42
Representation of analog signals in the process image 46
Assignment of terminals in the integrated PLC 47
Support and Service 51
Beckhoff Headquarters 51
2 BC3100
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.
BC3100
3
Foreword
i
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
Attention
environment.
Note
This symbol indicates information that contributes to better understanding.
4
BC3100
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 terminal controllers for
all current bus systems
Standard C rail assembly
Modularity
Display of channel status
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 terminal
controller or 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.
BC3100
5
Basic information
Bus end
isolation
contacts
Profibus
The K-bus
End terminal
Power input terminals
for
separately powered groups
The principle of the bus
terminal
The K-bus is the path taken by data within the terminal row. The bus
terminal controller 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 terminal
controllers. There are numerous software tools available which provide for
convenient planning, configuration and operation.
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 terminal
controller
BC3100
Powersupply Potential
for the input
BC3100 terminal
terminal
K- bus
x1
x10
BC3100
PotentialPower
Additional characteristics of
the bus terminal controllers
Bus terminal controllers for
various field bus systems
6
The bus terminal controllers (BC) differ from the bus couplers (BK) by
virtue of the fact that a real time PLC task runs in addition to processing of
the K-bus. Contrary to the bus couplers, by default the signals of the
terminals are processed by the PLC task while inputs and outputs of the
PLC task are then transmitted through the field bus. It is possible, however,
to split up terminals so that some terminals are preprocessed by the PLC
task, while others are forwarded directly via the field bus to the higher-level
system.
Various bus terminal controllers can be used to link the electronic terminal
strip with an integrated PLC task swiftly and easily to diverse field bus
systems. Later conversion to a different field bus system is also possible.
The bus terminal controller assumes all checking and control tasks that are
needed for operation of the connected bus terminals. The bus terminals
are operated and configured exclusively via the bus terminal controller. The
field bus, the K-bus and the I/O level are electrically isolated.
BC3100
Basic information
02
01
+
4
3
2
1
Power LEDs
Bus coupler / power contacts
The PLC task continues running as an autonomous system if the exchange
of data via the field bus should temporarily fail.
The interfaces
There are six ways of making a connection to a bus terminal controller.
These interfaces are designed as plug connections and spring terminals.
The Profibus controller
BC3100
PROFIBUS
RUN
BF
DIA
24V
00X0
0V
K-bus
Profibus
Power supply bus coupler
+
24 V DC / GND
x1
0
1
9
2
8
3
7
4
6
x10
0
9
8
7
6
5
BECKHOFF
BC3100
PE PE
5
Configuration
port
24 V DC on the topmost
terminals
Power supply
The bus terminal controllers 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
terminal controller but (via the K bus) also the bus terminals. The power
supply of the bus terminal controller 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 BC3100 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
BC3100
the spring contacts. The slot and key guides at the top and bottom of the
Input
power contacts
power contacts
7
Basic information
bus terminal controller and bus terminals ensure reliable location of the
power contacts.
9-pin Sub-D female
connector
Serial interface under the
front flap
6 contacts at the side
3 supply groups:
fieldbus
K-bus
peripheral level
Fieldbus connection
On the left-hand side there is a flat recessed area where you can plug in
the typical Profibus male connectors. 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“).
Configuration interface
On the bottom side of the front area, the bus terminal controllers are
equipped with an RS 232 interface. The miniature connector can be
connected to a PC with a connecting cable and the KS2000 configuration
software. The interface permits configuration of the analog channels.
Depending on the scope of performance of the field bus, this functionality
can also be realized with field bus-specific functions.
The miniature connector also serves to connect to the TwinCAT PLC
programming environment on a PC. It is used to load, start and stop the
program, breakpoints are set and the program is run in the STEP mode
etc.
Depending on the scope of performance of the field bus and the availability
of a corresponding TwinCAT field bus interface, this functionality can also
be realized via the field bus, with the result that several bus terminal
controllers that are physically connected to the same field bus can be
operated without replugging an RS 232 connection. This feature is
currently not yet supported by TwinCAT.
K-bus contacts
The connections between the BC3100 and the bus terminals are effected
by gold contacts at the right-hand side of the bus terminal controller. 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 BC3100 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 terminal
controller to locate the interruption and report it.
Supply isolation
The BC3100 operate with three independent supplies. The input power
supplies the electrically isolated K-bus circuitry in the bus terminal
controller 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.
8
BC3100
Basic information
Periphery level
Bus terminals
Bus coupler
24 V DC
Bus terminal test Structure list
Setting up the power levels
in the bus terminal system
K-bus
Field bus
Start-up behavior of the bus
terminal controller
The operating modes of the bus coupler
After power on, in a "self-test" the bus terminal controller checks all
functions of its components and communication by the K-bus. The red I/O
LED flashes during this phase. After successful completion of the self-test,
the bus terminal controller begins to test the plugged in bus terminals (bus
terminal test) and reads the configuration. An internal structure list is
created on the basis of the bus terminals' configuration. The bus terminal
controller assumes the "STOP" operating state in the event of an error.
After error-free start up, the bus terminal controller assumes the "field bus
start/PLC start" state. If a PLC program is stored in the flash memory, it is
loaded and started regardless of whether the field bus is running. The
inputs of the PLC task have been set to zero during start up.
Power on selftest
BC3100
Depending on the field bus functionality, the bus terminal controller reports
a possible error via the field bus. The BC3100 generally has to be restarted
after the error has been remedied.
9
Basic information
020201
01
+++
+
PEPEPE
PE
RUN
DIA
24V
4
3
2
1
0
0
47
12
X1
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 terminal controller and some
number of bus terminals. The dimensions of the bus terminal controller do
not depend on the fieldbus system. If you use large plugs, for example like
some of the bus plugs used for the Profibus, they may protrude above the
overall height of the cabinet.
Dimensions of a bus
terminal controller
PROFIBUS
BF
24V
0V 0V
94
0
1
9
2
8
3
7
4
6
5
BECKHOFF
X10
0
1
9
8
7
6
5
The overall width of the construction is the width of the BC3100, including
the bus end terminal, plus the width of the installed bus terminals. The bus
terminals are 12 mm or 24 mm wide, depending on their function.
Depending on the gauge of cables used the overall height of 68 mm may
be overstepped by about 5 mm to 10 mm by the cables at the front.
Assembly and connections
It takes only a slight pressure to latch the bus terminal controller and the
various bus terminals onto a supporting 35mm C rail and a locking
mechanism then prevents the individual housings from being removed.
You can remove them without effort if you first release the latching
mechanism by pulling the orange tab. You should carry out work on the
bus terminals and the bus terminal controller only while they are switched
off: if you plug or unplug components while the power is on you may briefly
provoke some undefined state (and, for instance, reset the bus coupler).
You can attach up to 64 bus terminals in series on the right-hand side of
the BC3100. When you assemble the components, make sure that you
mount the housings so that each slot comes together with the
corresponding key. You cannot make any functional connections merely by
pushing the housings together along the supporting track. When they are
correctly mounted there should be no appreciable gap between the
adjacent housings.
The right-hand side of a BC3100 is mechanically similar to a bus terminal.
There are eight connections on the top which can be used to connect to
thick-wire or thin-wire lines. The connection terminals are spring loaded.
BC3100
10
BC3100
Basic information
Insulation test
PE power contacts
You open a spring terminal by applying a slight pressure with a screwdriver
or other pointed tool in the opening above the terminal and you can then
insert the wire into the terminal without any obstruction. When you release
the pressure the terminal will automatically close and hold the wire
securely and permanently.
The connection between bus terminal controller and bus terminals is
automatically effected by latching the components together. The K bus is
responsible for passing data and power to the electronic components of the
bus terminals. In the case of digital bus terminals, the field logic receives
power via the power contacts. Latching the components together has the
effect that the series of power contacts constitutes a continuous power
track. Please refer to the circuit diagrams of the bus terminals: some bus
terminals do not loop these power contacts through, or not completely (e.g.
analog bus terminals or 4-channel digital bus terminals). Each power input
terminal interrupts the series of power contacts and constitutes the
beginning of a new track. The bus terminal controller can also be used to
supply power to the power contacts.
The power contact labeled "PE“ can be used as protective earth or ground.
This contact stands proud for safety reasons and can carry short-circuit
currents of up to 125A. Note that in the interests of electromagnetic
compatibility the PE contacts are capacitively connected to the supporting
track. This may lead to spurious results and even damage to the terminal
when you test the insulation (e.g. insulation test for breakdown using a
230V mains supply to the PE line). You should therefore disconnect the PE
line on the bus coupler while you carry out insulation tests. You can
disconnect other power supply points for the duration of the test by drawing
the power supply terminals out from the remaining row of terminals by at
least 10mm. If you do this, there will be no need to disconnect the PE
connections.
The protective earth power contact ("PE“) may not be used for any other
connections.
BC3100
11
Basic information
Electrical data
The electrical data specific to the field bus is listed in this chapter. The
following table shows the data in an overview:
Technical data’s BC3100
Number of bus terminals
Digital peripheral signals
Analog peripheral signals
Maximum number of bytes
Programming possibility
Program size
Program memory
Data memory
Permament flags
Run time system
PLC cycle time
Programming languages
Field bus interface
Baud rates
Bus connection
Power supply
Input current
Power-on current
Recommended fuse
K-bus power supply up to
Power contact voltage
Power contact current load
Diaelectric strength
Operating temperature
Storage temperature
Relative humidity
Vibration/shock resistance
EMC/emssion
Installed position
Degree of protection
64
256 inputs/outputs
128 inputs/outputs
512 bytes I and 512 bytes O
via programming interface (TwinCAT BC) or Profibus-DP (TwinCAT)
approximately 3000 plc statements
32 kbytes
32 kbytes
512 bytes
1 PLC task
approximately 3 ms for 1000 commands (including K-bus I/O cycle)
IL, LAD, CSF, SFC, ST
Profibus-DP
automatic baud rate detection up to 12 MBaud
1 x D-sub connector, 9-pole, with screen
24 V DC, (20...29 V DC)
70 mA + (total K-bus current/4
500 mA max.
2.5 x continuous current
≤ 10 A,
1750 mA
24 V DC max.
10 A max.
500 Vrms (Power contact/supply voltage/field bus)
0°C ... +55°C
-25°C ... +85°C
95%, no condensation
in accordance withIEC 68-2-6 / IEC 68-2-27
in accordance with EN 50082 (ESD, Burst) / EN 50081
any
IP20
Current consumption on the
K-Bus
For operation of the K-bus electronics, the bus terminals require energy
from the K-bus that is supplied by the bus terminal controller. Refer to the
catalog or the corresponding data sheets of the bus terminals for details of
the K-bus current consumption. In doing so, pay attention to the maximum
output current of the bus terminal controller that is available for powering
the bus terminals. 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.
12
BC3100
Basic information
The peripheral data in the process image
After power on, the BC3100 determines the configuration of the plugged-in
input/output terminals. The affiliations between the physical slots of the
input/output channels and the addresses of the process image are defined
automatically or by programming by the bus terminal controller depending
on the settings via the configuration interface. If these affiliations are
programmed, digital and analog signals can be distributed channel by
channel in any order to the process image of the PLC task (global variables
%I* (inputs) and %Q* (outputs)) or of the field bus (process data that is
transferred through the field bus). The setting is defined manually with the
configuration interface or, depending on the field bus functionality of the
bus terminal controller, with the TwinCat System Manager at the variable
level.
By default, automatic allocation is set for the bus terminal controllers. This
is described below:
The BC3100 creates an internal allocation list in which the input/output
channels have a specific position in the process image. Here, a distinction
is made according to inputs and outputs and according to bit-oriented
(digital) and byte-oriented (analog or complex) signal processing.
Two groups with only inputs and only outputs each are formed. The byteoriented channels are located in ascending order at the lowest address in
one group. The bit-oriented channels are located after this block.
Digital signals
(bit-oriented)
Digital signals are bit-oriented. This means that one bit of the process
image is assigned to each digital channel. The bus terminal controller sets
up a block of memory containing the current input bits and arranges to
immediately write out the bits from a second block of memory which
belongs to the output channels.
The precise assignment of the input and output channels to the process
image of the control unit is explained in detail in the Appendix by means of
an example.
Analog signals
(byte-oriented)
The processing of analog signals is always byte-oriented and analog input
and output values are stored in memory in a two-byte representation. The
values are held as "SIGNED INTEGER“ or "twos-complement“. The digit
"0“ represents the input/output value "0V“, "0mA“ or "4mA“. When you use
the default settings, the maximum value of the input/output value is given
by "7FFF“ hex. Negative input/output values, such as -10V, are
represented as "8000“ hex and intermediate values are correspondingly
proportional to one another. The full range of 15-bit resolution is not
realized at every input/output level. If you have an actual resolution of 12
bits, the remaining three bits have no effect on output and are read as "0“
on input. Each channel also possesses a control and status byte in the
lowest value byte. If the control/status byte is mapped in the control unit
has to be configured in the master configuration software. An analog
channel is represented by 2 bytes user data in the process image.
Special signals and
interface
A bus terminal controller supports bus terminals with additional interfaces,
such as RS232, RS485, incremental encoder, etc.. These signals can be
regarded in the same way as the analog signals described above. A 16-bit
data width may not be sufficient for all such special signals; the bus coupler
can support any data width.
Word Alignment
The analog or special signals are mapped with word alignment when the
peripheral signals are allocated into the process image of the PLC task
BC3100
13
Basic information
and, depending on the field bus, into the process image.
Process image allocation
By default, all terminals are allocated to the process image of the PLC task
(beginning with the address %Q*0 or %I*0) but, via the configuration
interface, the peripheral signals can also be allocated terminal by terminal
to the field bus process image, with the result that they would be
transmitted directly via the field bus without pre-processing by the PLC
task.
Default assignment of
inputs and outputs to the
process image
When the BC3100 is first switched on it determines the number of attached
bus terminals and sets up a list of assignments. This list distinguishes
between analog channels and digital channels and between input and
output; which are grouped separately. The assignments begin immediately
to the left of the BC3100. The software in the bus coupler creates the
assignment list by collecting the entries for the individual channels one at a
time, counting from left to right. These assignments distinguish four groups:
Function type of the channel Assignment level
1.
Analog outputs byte-wise assignment
2.
Digital outputs bit-wise assignment
3.
Analog inputs byte-wise assignment
4
Digital inputs bit-wise assignment
Analog inputs/outputs are representative of other complex multi-byte signal
bus terminals (RS232, SSI sensor interface, ...)
Output data in the BC3100
Overview of the subdivision of the process image in the BC3100
O0
...
byte-oriented data
...
Ox
Ox+1
bit-oriented data
Ox+y
Input data in the BC3100
I0
...
byte-oriented data
...
Ix
Ix+1
...
bit-oriented data
...
Ix+y
Assignment of the process
image of the PLC task to
the field bus process image
Depending on the setting, the affiliations between the inputs and the
outputs of the PLC task and the field bus process image are defined
automatically by the BC3100 via the configuration interface or by
programming. When assignments are programmed, inputs and outputs can
be distributed bit by bit in any order to the field bus process image. This is
set manually with the configuration interface or, depending on the field bus
functionality of the bus terminal controller, with the TwinCAT System
Manager at the variable level.
By default, automatic assignment is set for the bus terminal controllers. In
this case, one coherent area each of the inputs or outputs of the PLC task
can be mapped into the field bus process image. The initial offset and
14
BC3100
Basic information
length of the area to be mapped can be set by way of the configuration
interface. As the terminal signals are placed into the process image of the
PLC task as from address zero, the first meaningful offset as from when
inputs and outputs of the PLC task are mapped into the field bus process
image is the first free address where there are no longer any terminal
signals.
Data consistency
Processing complex signals
Data which contains no contradictions is said to be consistent. The
following consistency is required here: 1. The high byte and low byte of an
analog value (word consistency), 2. The control/status byte and the
corresponding parameter word for accessing the register. The interaction
of the peripherals with the control unit means that data can initially be
guaranteed consistent only within an individual byte: the bits which make
up a byte are read in together, or written out together. Byte-wise
consistency is quite adequate for processing digital signals but is not
sufficient for transferring values longer than eight bits, such as analog
values. The various bus systems guarantee consistency to the required
length. It is important to use the appropriate procedure for importing this
consistent data from the master bus system to the control unit. You will find
a detailed description of the correct procedure in the User Guide of the
appropriate bus system, in particular in the description of the standard
master units that are installed. The chapters of this manual which deal with
the fieldbus refer to the most common of these standard units.
All byte-oriented signal channels such as RS232, RS485 and incremental
encoder, can use byte lengths greater than two. Apart from the actual
difference in length, the procedure is always comparable with that for
analog signals.
Commissioning and diagnostics
The diagnostic LEDs
After power on, the bus terminal controller immediately checks the
connected configuration. Error-free start up is signalled by virtue of the fact
that the red "I/O ERR" LED goes off. When it flashes, the "I/O ERR" LED
indicates an error in the area of the terminals. The error code can be
determined by the frequency and number of flashes. This enables swift
troubleshooting.
The bus terminal controller has two groups of LEDs to provide a status
display. The top group consisting of four LEDs indicates the status of the
respective field bus. The meanings of the "field bus" status LEDs are
explained in the corresponding chapters of this manual. They correspond
to the usual field bus displays.
There are two further green LEDs on the top right hand side of the bus
terminal controller to indicate the supply voltage. The left hand LED
indicates the 24 V power supply of the bus terminal controller. The right
hand LED signals the power supply of the Power contacts.
BC3100
15
Basic information
Local errors
Two LEDs, the "I/O Leds" in the area under the above-mentioned field bus
status LEDs, serve to indicate the operating states of the bus terminals and
of the connection to these bus terminals. The green LED lights up
whenever the signals to the terminals are being exchanged via the K-bus.
After an error-free start up of the bus terminal controller, the K-bus
exchange always takes place, even if the PLC program or the field bus is
not running. The reaction (inputs or outputs change to zero or remain
unchanged) to errors (field bus not running correctly or PLC task has
assumed the STOP state) can be set via the configuration interface. To
indicate errors, the red LED flashes at two different frequencies. Errors are
encoded as follows in the flashing code:
Fast flashing
First slow sequence
Second slow sequence
Error code Error argument Description
1 pulse
2 pulses
3 pulses
4 pulses
5 pulses
6 pulses
8 pulses
9 pulses
0
1
2
0
n (n > 0)
0 Terminal bus command error
0
n
n Terminal bus error during register
0
p(p>0)
0
p(p>0)
0
The number of pulses (n) indicates the position of the last bus terminal
before the error. Passive bus terminals, for example an infeed terminal, are
not counted.
In the case of some errors, the bus terminal controller does not end the
flashing sequence when the error has been remedied. The bus terminal
controller's operating state is still "Stop". The bus terminal controller can
only be restarted by switching the supply voltage off and on or by means of
a software reset.
It is only permitted to unplug bus terminals from the network and to plug
them in again after switching off. The electronic circuitries of the bus
terminals and of the bus terminal controller are largely protected against
destruction, but malfunctions and damage cannot be ruled out if terminals
are plugged together under a live voltage.
The occurrence of an error during ongoing operation does not immediately
trigger output of the error code via the LEDs. The bus terminal controller
must be prompted to diagnose the bus terminals. The diagnostic request is
generated after power on.
Start of the error code
Error code
Error argument
EEPROM checksum error
Inline code buffer overflow
Unknown data type
Programmed configuration
Invalid table entry/
Bus terminal controller
Invalid table comparison (terminal n)
Terminal bus data error
Breakage after terminal n (0: BC3100)
communication with terminal n
Not enough DP-Cfg_Data received
Invalid DP-Cfg_Data byte
Not enough DP-User_Prm_Data received
Invalid DP-User_Prm_Data byte
Invalid checksum in the
PLC program
16
BC3100
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