BECKHOFF BC3100 User Manual

PROFIBUS

Bus Terminal Controller BC3100

Technical Hardware Documentation

Version 2.1 2006-11-06

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

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

environment.

Attention

This symbol indicates information that contributes to better understanding.

i Note

4

BC3100

Basic information

Basic information

	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
Up to 64 bus terminals	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
each with 2 I/O channels	and can be combined as desired. The various types of terminal are all
for any form of signal	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
Decentralized wiring of the	control unit. Sensors and actors can be connected decentrally with minimal
I/O level	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
IPC as control unit	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
Bus terminal controllers for	used on all current bus systems and serve to reduce the diversity of parts
all current bus systems	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
	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.
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
	power input terminals to provide separate power supplies also helps to
	minimize the number of unused channels.
Display of channel status	The integrated light-emitting diodes close to the sensor/actor indicate the
	status of each channel.
BC3100	5

Basic information

The K-bus	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
End terminal	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.
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.

Profibus

	The principle of the bus	Bus terminal	Powersupply	Potential
	terminal	controller
			for the	input	Bus end
		BC3100
			BC3100	terminal	terminal
				K- bus

x1
x10	BC3100

Power

Potential

contacts

isolation

Additional characteristics of the bus terminal controllers

Bus terminal controllers for various field bus systems

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.

6

BC3100

Basic information

		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					X0	00
						PROFIBUS	01	2	Power LEDs
BC3100						RUN
									Bus coupler / power contacts
						BF
		Profibus				DIA	24V	0V	K-bus
									Power supply bus coupler
						BECKHOFF BC3100	+ +		24 V DC / GND
		port	x1
			9	0	1				Input
			8		3
		Configuration			2
			7	5
			6		4				power contacts
			x10				PE	PE
			9	0	1
			8		2
			7		3
			6	5	4				power contacts
		Power supply

24 V DC on the topmost terminals

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.

	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
	connection to the power supply of the bus couplers. The power input is
maximum 24 V	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
maximum 10 A	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.

Power contacts

On the right-hand side face of the BC3100 are three spring contacts which Spring contacts at the side 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

BC3100 7

Basic information

			bus terminal controller and bus terminals ensure reliable location of the
			power contacts.
			Fieldbus connection
			On the left-hand side there is a flat recessed area where you can plug in
9-pin	Sub-D	female	the typical Profibus male connectors. You will find a detailed description of
connector			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
Serial	interface	under the	equipped with an RS 232 interface. The miniature connector can be
front flap			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
6 contacts at the side			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
3 supply groups:			The BC3100 operate with three independent supplies. The input power
fieldbus			supplies the electrically isolated K-bus circuitry in the bus terminal
K-bus			controller and the K-bus itself. The power supply is also used to generate
peripheral level			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

Bus coupler

Bus terminals

Setting up the power levels

in the bus terminal system

K-bus

Field bus

Periphery level

24 V DC

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.

Start-up behavior of the bus terminal controller

Power on selftest

Bus terminal test Structure list

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.

BC3100

9

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 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		01	02	01	02
				RUN
				BF
				DIA		24V	0V	24V	0V
						+ +		+ +
100	X1
	9	0	1
	8		2
	7		3
	6	5	4
	94			BECKHOFF	BC3100
						PE	PE	PE	PE
	X10
	9	0	1
	8		2
	7		3
	6	5	4
				47				12

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.

10

BC3100

Basic information

	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.
Insulation test	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.
PE power contacts	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

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

BC3100

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.

Power-on current		2.5 x continuous current
Recommended fuse		≤ 10 A,
K-bus power supply up to		1750 mA
Power contact voltage		24 V DC max.
Power contact current load		10 A max.
Diaelectric strength		500 Vrms (Power contact/supply voltage/field bus)
Operating temperature		0°C ... +55°C
Storage temperature		-25°C ... +85°C
Relative humidity		95%, no condensation
Vibration/shock resistance		in accordance withIEC 68-2-6 / IEC 68-2-27
EMC/emssion		in accordance with EN 50082 (ESD, Burst) / EN 50081
Installed position		any
Degree of protection		IP20

Current consumption on the For operation of the K-bus electronics, the bus terminals require energy K-Bus 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

Digital signals

(bit-oriented)

Analog signals (byte-oriented)

Special signals and interface

Word Alignment

BC3100

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 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.

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.

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.

The analog or special signals are mapped with word alignment when the peripheral signals are allocated into the process image of the PLC task

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

Output data in the BC3100

Input data in the BC3100

Analog inputs/outputs are representative of other complex multi-byte signal bus terminals (RS232, SSI sensor interface, ...)

Overview of the subdivision of the process image in the BC3100

O0

...

byte-oriented data

...

Ox

Ox+1

bit-oriented data

Ox+y

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	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.

Processing complex signals 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
	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 diagnostic LEDs	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

16

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		Start of the error code
First slow sequence		Error code
Second slow sequence		Error argument

Error code		Error argument
1 pulse		0
		1
		2

2 pulses

0

n (n > 0)

Description

EEPROM checksum error

Inline code buffer overflow

Unknown data type

Programmed configuration Invalid table entry/

Bus terminal controller

Invalid table comparison (terminal n)

3 pulses		0		Terminal bus command error
4 pulses		0		Terminal bus data error
		n		Breakage after terminal n (0: BC3100)
5 pulses		n		Terminal bus error during register
				communication with terminal n
6 pulses		0		Not enough DP-Cfg_Data received
		p(p>0)		Invalid DP-Cfg_Data byte
8 pulses		0		Not enough DP-User_Prm_Data received
		p(p>0)		Invalid DP-User_Prm_Data byte
9 pulses		0		Invalid checksum in the
				PLC program

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.

BC3100