Shielding
The screen is to be connected over the entire length of the bus cable, and only galvanically grounded at one point, in order to avoid ground loops.
The design of the screening, in which HF interference is diverted through R/C elements to the mounting rail assumes that the rail is appropriately earthed and free from interference. If this is not the case, it is possible that HF interference will be transmitted from the mounting rail to the screen of the bus cable. In that case the screen should not be attached to the couplers - it should nevertheless still be fully connected through.
Notes related to checking the CAN wiring can be found in the
Trouble Shooting section.
Cable colors
Suggested method of using the Beckhoff CAN cable on Bus Terminal and Fieldbus Box:
BK51x0 pin
PIN BX5100 (X510)
Pin BK5151
CX8050, CX8051,
CXxxxx-B510/M510
Fieldbus Box pin
Pin FC51xx
Function
ZB5100 cable color
ZB5200 cable color
1
3
3
3
CAN Ground
black/ (red)
black
2
2
5
2
CAN Low
black
blue
3
5
1
5
Shield
Filler strand
Filler strand
4
7
4
7
CAN high
white
white
5
9
2
9
not used
(red)
(red)
BK5151, FC51xx, CX with CAN interface and EL6751: D-sub, 9 pin
The CANbus cable is connected to the FC51x1, FC51x2 CANopen cards and in the case of the EL6751 CANopen master/slave terminal via 9-pin Sub-D sockets with the following pin assignment.
Pin
Assignment
2
CAN low (CAN-)
3
CAN ground (internally connected to pin 6)
6
CAN ground (internally connected to pin 3)
7
CAN high (CAN+)
The unlisted pins are not connected.
The mounting rail contact spring and the plug shield are connected together.
Note: an auxiliary voltage of up to 30 VDC may be connected to pin 9. Some CAN devices use this to supply the transceiver.
BK5151, EL6751 pin assignment
FC51x2:
FC51x2
BK51x0/BX5100: 5-pin open style connector
The BK51x0/BX5100 (X510) Bus Couplers have a recessed front surface on the left hand side with a five pin connector.
The supplied CANopen socket can be inserted here.
BK51x0/BX5100 socket assignment
The left figure shows the socket in the BK51x0/BX5100 Bus Coupler. Pin 5 is the connection strip's top most pin. Pin 5 is not used. Pin 4 is the CAN high connection, pin 2 is the CAN low connection, and the screen is connected to pin 3 (which is connected to the mounting rail via an R/C network). CAN-GND can optionally be connected to pin 1. If all the CAN ground pins are connected, this provides a common reference potential for the CAN transceivers in the network. It is recommended that the CAN GND be connected to earth at one location, so that the common CAN reference potential is close to the supply potential. Since the CANopen BK51X0/BX5100 Bus Couplers provide full electrical isolation of the bus connection, it may in appropriate cases be possible to omit wiring up the CAN ground.
ZS1052-3000 Bus Interface Connector
The ZS1052-3000 CAN Interface Connector can be used as an alternative to the supplied connector. This makes the wiring significantly easier. There are separate terminals for incoming and outgoing leads and a large area of the screen is connected via the strain relief. The integrated terminating resistor can be switched externally. When it is switched on, the outgoing bus lead is electrically isolated - this allows rapid wiring fault location and guarantees that no more than two resistors are active in the network.
LC5100: Bus connection via spring-loaded terminals
In the low cost LC5100 Coupler, the CAN wires are connected directly to the contact points 1 (CAN-H, marked with C+) and 5 (CAN-L, marked with C-). The screen can optionally be connected to contact points 4 or 8, which are connected to the mounting rail via an R/C network.
LC5100
Note
Risk of device damage!
On account of the lack of electrical isolation, the CAN driver can be destroyed or damaged due to incorrect cabling. Always carry out the cabling in the switched-off condition.
First connect the power supply and then the CAN. Check the cabling and only then switch on the voltage.
TwinCAT Development Environment
The Software for automation TwinCAT (The Windows Control and Automation Technology) will be distinguished into:
▪
TwinCAT 2: System Manager (Configuration) & PLC Control (Programming)
▪
TwinCAT 3: Enhancement of TwinCAT 2 (Programming and Configuration takes place via a common Development Environment)
Details:
▪
TwinCAT 2:
–
Connects I/O devices to tasks in a variable-oriented manner
–
Connects tasks to tasks in a variable-oriented manner
–
Supports units at the bit level
–
Supports synchronous or asynchronous relationships
–
Exchange of consistent data areas and process images
–
Datalink on NT - Programs by open Microsoft Standards (OLE, OCX, ActiveX, DCOM+, etc.)
–
Integration of IEC 61131-3-Software-SPS, Software- NC and Software-CNC within Windows NT/2000/XP/Vista, Windows 7, NT/XP Embedded, CE
–
Interconnection to all common fieldbusses
–
More…Additional features:
▪
TwinCAT 3 (eXtended Automation):
–
Visual-Studio®-Integration
–
Choice of the programming language
–
Supports object orientated extension of IEC 61131-3
–
Usage of C/C++ as programming language for real time applications
–
Connection to MATLAB®/Simulink®
–
Open interface for expandability
–
Flexible run-time environment
–
Active support of Multi-Core- und 64-Bit-Operatingsystem
–
Automatic code generation and project creation with the TwinCAT Automation Interface
–
More…Within the following sections commissioning of the TwinCAT Development Environment on a PC System for the control and also the basically functions of unique control elements will be explained.
Please see further information to TwinCAT 2 and TwinCAT 3 at
http://infosys.beckhoff.com.
Additional information
·
Installation of the TwinCAT real-time driver·
Notes regarding ESI device description·
OFFLINE configuration creation·
ONLINE configuration creation·
EtherCAT slave process data settingsInstallation of the TwinCAT real-time driver
In order to assign real-time capability to a standard Ethernet port of an IPC controller, the Beckhoff real-time driver has to be installed on this port under Windows.
