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Summary of Contents for Burkert buS
- Page 1 Type büS Bürkert System Bus Design Guideline...
- Page 2 We reserve the right to make technical changes without notice. © 2020 - 2022 Operating Instructions 2207/01_EU-EN 00815392 / Original EN...
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Page 3: Table Of Contents
Terminal block, 5-pin ...................... 12 4.4.4 Terminal block, 4-pin ...................... 13 5 Getting to know the büS topologies...................... 14 What is a bus topology and why do you need it? ................ 14 Common terms of bus topology..................... 14 5.2.1 Trunk line ........................... 14 5.2.2 Stub line .......................... 14... - Page 4 12.4 Diagnostic port .......................... 32 12.5 Baud rate ............................ 32 12.6 büS stick............................ 32 12.7 Stub lines ............................ 32 12.8 Bus load............................ 32 12.9 Power consumption........................ 33 12.10 Grounding power supplies ...................... 33 12.11 Shielding of büS network ....................... 33 13 büS networks with maximum network expansion .................. 34...
- Page 5 Type büS Contents 13.1.1 500 kbit/s ........................... 34 13.1.2 250 kbit/s ........................... 35 13.1.3 125 kbit/s ........................... 36 13.2 Star topology with a junction box.................... 37 13.3 Tree topology with a junction box .................... 37 14 Troubleshooting ............................ 38 14.1 Sporadic disconnections ........................ 38 14.2 Red LED (failure) ..........................
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Page 6: Symbols Used
Type büS Symbols used SYMBOLS USED Trunk line Stub line Y-connector Y-connector with interrupt Termination resistor Power supply Measurement point Diagnostics... -
Page 7: Introduction
What is the Bürkert system bus (büS/EDIP)? The Bürkert system bus, also referred to as büS, is based on the widely spread CANopen standard and is fully downwards compatible to this standard. The büS concept does not require a master. Field devices can easily interchange process data and detailed diagnostic data. -
Page 8: Creating A Rough Project Plan
Type büS Creating a rough project plan CREATING A ROUGH PROJECT PLAN Block diagram, devices, postion, protocols Which devices are planned? Create an overview of the positioning of your devices. Are the devices distributed in an equidistant or a non-equidistant manner? PROFINET büS equidistant... -
Page 9: Getting To Know The Basics Of A Büs Infrastructure - Accessories, Cables, Pin Assignment
Type büS Getting to know the basics of a büS infrastructure – accessories, cables, pin assignment GETTING TO KNOW THE BASICS OF A büS INFRASTRUCTURE – ACCESSORIES, CABLES, PIN ASSIGNMENT What is the purpose of the various accessories In this chapter, the various components required for cabling are explained in detail. büS devices are widely equipped with standard M12 connectors and. -
Page 10: Passive Junction Box
Type büS Getting to know the basics of a büS infrastructure – accessories, cables, pin assignment 4.2.2 Passive junction box Definition: A passive junction box is an IP65/IP67 block with connectors for the power supply and multiple büS connectors. It is a passive module and, therefore, does not have to be configured. Purpose: The passive junction box allows multiple connections to büS devices in a star form. -
Page 11: Termination
4.3.1 Characteristic impedance and cables standards All nodes are connected to each other through a physically conventional two-wire bus. The wires are a twis- ted pair with a 120 Ω (nominal) characteristic impedance. CiA 301 (CANopen application layer) is standard- ised as EN 50325-4. -
Page 12: Pin Assignment
Type büS Getting to know the basics of a büS infrastructure – accessories, cables, pin assignment Pin assignment Various standard connectors are available for Bürkert devices with a büS interface. 4.4.1 M12 connector male, 5-pin (A-coded) M12 connector male, 5-pin (A-coded) Assignment SHIELD DGND... -
Page 13: Terminal Block, 4-Pin
Type büS Getting to know the basics of a büS infrastructure – accessories, cables, pin assignment 4.4.4 Terminal block, 4-pin Terminal block, 4-pin Assignment DGND CAN_L CAN_H +24 V DC Tab. 4: Terminal block, 4-pin... -
Page 14: Getting To Know The Büs Topologies
What is a bus topology and why do you need it? The arrangement of different devices on the bus defines the topology. Different topologies influence the quality of communication and certain topologies are, therefore, recommended to achieve a good network design. -
Page 15: Which Topologies Are Recommended
Type büS Getting to know the büS topologies Which topologies are recommended? The following topologies achieve the best results with regard to signal quality. 5.3.1 Line topology (daisy chain) All devices are connected in single row without a stub line. Trunk Device 1 Device n... -
Page 16: Star Topology
Type büS Getting to know the büS topologies 5.3.3 Star topology A star topology is used to interconnect devices when space is limited and a setup with a daisy chain topo- logy is not possible. Stub Device 1 Device n Junction box Device 2 Device 3... -
Page 17: Which Topologies Are Not Permitted
Type büS Getting to know the büS topologies Which topologies are NOT permitted The topologies described in this section are not permitted. Never use them in a büS or CANopen network. 5.5.1 Ring topology A ring topology is not permitted in a CANopen network. Choose another topology for the network. Trunk Device 1 Device 2... -
Page 18: Detailed Project Plan 1
Type büS Detailed project plan 1 DETAILED PROJECT PLAN 1 Floor plan Create a detailed project plan using the aforesaid information about devices, cables lengths, topology, junc- tion boxes and Y-connectors. Are the devices close to each other? YES: plan the network with a passive junction box NO: plan the network with Y-connectors Rules: ▪... -
Page 19: Mixed Network
Type büS Detailed project plan 1 Network with Y-connectors and stub lines 0.5 m 0.5 m 0.5 m 0.5 m Fig. 16: Network with Y-connectors and stub lines 6.1.3 Mixed network In a mixed network, it is important to indicate the total length of the cables. This includes the length of all trunk lines and stub lines. -
Page 20: Technical Know-How
Type büS Technical know-how TECHNICAL KNOW-HOW Termination resistors Termination resistors are located on each side of the trunk line. The impedance is approximately 60 Ω between CAN-HIGH and CAN-LOW. Exception: In a large network with long stub lines, the longest distance between two devices should be es- timated. -
Page 21: Detailed Project Plan 2
Type büS Detailed project plan 2 DETAILED PROJECT PLAN 2 Completion – floor plan A cabling plan using the accessories, cables lengths, topology, junction box, Y-connector, termination res- istor and a diagnostics port must be created. 8.1.1 Network with a junction box Junction box Device 1 Device 5... -
Page 22: Mixed Network
Type büS Detailed project plan 2 8.1.3 Mixed network 10 m 0.5 m 0.5 m 0.5 m Junction box Device 5 0.5 m Device 3 Device 6 10 m Device 4 Device 7 Diagnostics Termination resistor Fig. 21: Mixed network For good signal quality, it is important to determine the longest distance between two devices in the entire network. -
Page 23: Network Power Supply
Type büS Network power supply NETWORK POWER SUPPLY Power segments Calculate the overall power consumption of all the devices in the network. Build power segments with a maximum load of 100 W. This refers to the M12 connector (A-coded). This component has a current limit of approx. -
Page 24: Detailed Project Plan 3
Type büS Detailed project plan 3 DETAILED PROJECT PLAN 3 10.1 Cabling plan Rough cabling plan, topology, rules of cabling (table). Place your power supply (power < 100W) close to the load. Y-connector, passive junction box, external power supply, galvanically isolated switched-mode power sup- plies (recognised UL Class 2). -
Page 25: Mixed Network
Type büS Detailed project plan 3 10.1.3 Mixed network 10 m 0.2 m 0.5 m 0.5 m 0.5 m Junction box Device 3 Device 6 10 m Device 7 Device 4 0.5 m Device 5 Power supply Y-connector + Termination resistor Diagnostics interrupt Fig. 26: Mixed network... -
Page 26: Shielding Of Edip Devices
Type büS büS network shielding büS NETWORK SHIELDING 11.1 Shielding of EDIP devices Detailed shielding information for each device can be found in pin assignment of technical data sheet and operating instructions. There are three types of device-internal shieldings: Direct: Direct connection of shield to FE Device (Direct) büS cable shield... -
Page 27: Network With Direct Shielded Devices
Type büS büS network shielding 11.3 Network with direct shielded devices Shield is grounded at multiple points to FE. Direct shield connection on both cable ends or at multiple devices to FE has shielding effects against E and H fields. But take care for equipotential FE grounding area to prevent compensation currents over shield! Equipotential, clean FE area Gateway... -
Page 28: Network With Rc Shielded Devices
Type büS büS network shielding 11.4 Network with RC shielded devices In a network with RC shielded devices, shield must be only on one point directly connected to FE. This shielding set-up only shields E-Fields, but it is usually preferred, when FE area connection is poor. ▪... -
Page 29: Network With None Shield Connected Devices
Type büS büS network shielding 11.5 Network with none shield connected devices Not recommended to have “None” shield connected devices only. Network shield would be floating at all and this is equal to unshielded. When using devices without an internally connected shield, take care that one end of büS shield must be connected directly to FE. -
Page 30: Mixed Network With Various Shieldings
Type büS büS network shielding 11.6 Mixed network with various shieldings A planned büS network (a) is revised, some issues were identified (b) and finally some solutions are found (c). a) Initial network Building A: Building B: Equipotential, clean FE Equipotential, clean FE Device 3 Device 5 (Direct) - Page 31 Type büS büS network shielding c) Modifications (possible solutions) Building B: Building A: Equipotential, clean FE Equipotential, clean FE Device 3 Device 5 (Direct) (Direct) Device 7 Gateway (None) Device 1 (Direct) Device 2 Device 6 (RC) (Direct) Outside building A FE medium quality Device 4 (Direct)
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Page 32: Best Practice Instructions
Bus load The maximum bus load is 40%. The specific bus load of a device is specified in the communication data sheet. To calculate the total bus load, sum up the values from the communication data sheet for all devices. -
Page 33: Power Consumption
Type büS Best practice instructions 12.9 Power consumption It is important to consider the power consumption of a device as early as possible in the planning. Using the information about the total power consumption of the network, the accessories and the number of power supplies can be planned. -
Page 34: 13 Büs Networks With Maximum Network Expansion
Type büS büS networks with maximum network expansion büS NETWORKS WITH MAXIMUM NETWORK EXPANSION Networks with varying devices, cable lengths, baud rates and topologies are tested. The networks shown here should only serve as examples of what is possible and are intended as a refer- ence point for your own setup. - Page 35 Type büS büS networks with maximum network expansion 13.1.2 250 kbit/s The network was tested with 84 devices and a total cable length of 175 metres and worked without any er- rors. 50 m 21 Devices 8 Devices 9 Devices 23 Devices 50 m 50 m...
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Page 36: 125 Kbit/S
Type büS büS networks with maximum network expansion 13.1.3 125 kbit/s The network can have a total cable length of 475 metres with 84 devices and 1 büS stick. 100 m 50 m 50 m 9 Devices 23 Devices 21 Devices 8 Devices 100 m 50 m... -
Page 37: Star Topology With A Junction Box
Type büS büS networks with maximum network expansion 13.2 Star topology with a junction box If a passive junction box is used, all the cables are stub lines. With a baud rate of 500 kbit/s, a total stub line length of 25 metres is permitted. The maximum length of each stub line is limited to 5 metres. If all the stub lines have the same length, the position of the termination resistor is irrelevant. -
Page 38: Troubleshooting
▪ More or less than two termination resistors ▪ Total cable length is too long ▪ Total stub line length is too long ▪ Bus load is too high ▪ Undersized power supply Solution: ▪ Measurement of the impedance between CAN-High and CAN-Low. The impedance should be approx. -
Page 39: Yellow Led On The Device (Out Of Specification)
Type büS Troubleshooting Common problems: ▪ Partner allocation is active ▪ PLC has “stopped” ▪ Simulation is active ▪ Manual mode Solution: ▪ Wait until the device finds its partner in the network ▪ Set the PLC to “RUN” ▪ Deactivate simulation ▪... -
Page 40: Restarting Some Devices
Type büS Troubleshooting 14.6 Restarting some devices If the LED first lights up yellow and then turns red or green, it is an indication that the power supply has reached a limit for stable operation. If one device switches an actor on, the voltage drop is so high that the power falls below the limit and a restart will be performed. -
Page 41: Appendix
Type büS Appendix APPENDIX 15.1 Accessories - büS stick interface sets Accessories - büS stick interface sets Bürkert order no. USB-büS interface set 1 00772426 USB-büS interface set 2 00772551 Tab. 8: büS stick 15.2 Accessories - connectors Accessories - connectors Bürkert order no. -
Page 42: Accessories - Extension Cables
Type büS Appendix 15.4 Accessories - extension cables Accessories - extension cables Bürkert order no. büS extension cable 0.1 m 00772492 büS extension cable 0.2 m 00772402 büS extension cable 0.5 m 00772403 büS extension cable 1 m 00772404 büS extension cable 3 m 00772405 büS extension cable 5 m 00772406...
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