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Symbols, Contents
1
PROFIBUS Networks
Topologies of SIMATIC NET PROFIBUS
2
Networks
3
Configuring Networks
4
Passive Components of RS–485 Networks
SIMATIC NET
PROFIBUS Networks 5
Active Components of RS–485 Networks
6
Manual
Passive Components for PROFIBUS–PA
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Passive Components for Electrical Networks
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Active Components for Optical Networks
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Active Components for Wireless Networks
A
Testing PROFIBUS
Lightning and Surge Voltage Protection for
B
LAN Cables Between Buildings
C
Installing LAN
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Safety Guidelines Danger ! indicates that death, severe personal injury or substantial property damage will result if proper precau- tions are not taken. Warning ! indicates that death, severe personal injury or substantial property damage can result if proper precau- tions are not taken. Caution ! indicates that minor personal injury or property damage can result if proper precautions are not taken. Note draws your attention to particularly important information on the product, handling the pro
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Symbols PROFIBUS 830–1 T connecting cable PROFIBUS 830-2 connecting cable LAN cable (twisted-pair) Duplex FO cable Wireless transmission (infrared) Bus connector S7–300 S7–400 ET200S OP25 ET 200M (with IM 153–2 FO) PG/PC/OP AS-i branch PROFIBUS Networks SIMATIC NET 6GK1970-5CA20-0AA1 Release 2 05/2000 i
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Symbols Optical link module (OLM) Optical bus terminal (OBT) Infrared link module (ILM) Repeater PROFIBUS Networks SIMATIC NET 6GK1970-5CA20-0AA1 Release 2 05/2000 ii
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Contents Contents 1 PROFIBUS NETWORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Local Area Networks in Manufacturing and Process Automation . . . . . . . 1-2 1.1.1 General Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.1.2 Overview of the SIMATIC NET System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2 Basics of the PROFIBUS Network . . . . . . . . . .
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Contents 3.3 Transmission Delay Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22 3.3.1 Configuring Optical Buses and Star Topologies with OLMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23 3.3.2 Configuring Redundant Optical Rings with OLMs . . . . . . . . . . . . . . . . . . . . 3-27 3.3.3 Example of Configuring the Bus Parameters in STEP 7 . . . . . . . . . . . . . . . 3-31 4 Passive Components for RS-485 Networks
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Contents 5.3 Installing and Uninstalling the RS-485 Repeater . . . . . . . . . . . . . . . . . . . . . 5-9 5.4 Ungrounded Operation of the RS-485 Repeater . . . . . . . . . . . . . . . . . . . . . 5-12 5.5 Connecting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13 5.6 Connecting the LAN Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14 5.7 PROFIBUS Terminator . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents A.2.4 Checking the Optical Signal Quality with PROFIBUS OLM V3 . . . . . . . . . A-12 B Lightning and Surge Voltage Protection for LAN Cables Between Buildings B-1 B.1 Why Protect Your Automation System From Overvoltage? . . . . . . . . . . . . B-2 B.2 Protecting LAN Cables from Lightning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2 B.2.1 Instructions for Installing Coarse Protection . . . . . . . . . . . . . . . . . . . . . . . . . B-5 B.2.2 Instructions for Installi
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Contents F.7 Dimension Drawings Infrared Link Module ILM . . . . . . . . . . . . . . . . . . . . . . F-11 F.8 Dimension Drawings Optical Link Module OLM . . . . . . . . . . . . . . . . . . . . . . F-12 G Operating Instructions ILM / OLM / OBT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1 H General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-1 H.1 Abbreviations/Acronyms . . . . . . . . . . . . . .
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Contents PROFIBUS Networks SIMATIC NET 6GK1970-5CA20-0AA1 Release 2 05/2000 viii
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1 PROFIBUS NETWORKS
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PROFIBUS NETWORKS 1.1 Local Area Networks in Manufacturing and Process Automation 1.1.1 General Introduction Communication Systems The performance of control systems is no longer simply determined by the programmable logic controllers, but also to a great extent by the environment in which they are located. Apart from plant visualization, operating and monitoring, this also means a high-performance communication system. Distributed Systems Distributed automation systems are being used increasing
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PROFIBUS NETWORKS SIMATIC NET With SIMATIC NET, Siemens provides an open, heterogeneous communication system for various levels of process automation in an industrial environment. The SIMATIC NET communication systems are based on national and international standards according to the ISO/OSI reference model. The basis of such communication systems are local area networks (LANs) which can be implemented in one of the following ways: Electrically Optically Wireless Combined electrical/opti
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PROFIBUS NETWORKS Industrial Ethernet/Fast Ethernet A communication network for the LAN and cell area using baseband technology complying with IEEE 802.3 and using the CSMA/CD medium access technique (Carrier Sense Multiple Access/Collision Detection). The network is operated on 50 Ω triaxial cable 100 Ω Twisted pair cables Glass fiber-optic cable AS-Interface The actuator sensor interface (AS-i) is a communication network for automation at the lowest level for connecting binary actuators
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PROFIBUS NETWORKS 1.2 Basics of the PROFIBUS Network EN 50170 SIMATIC NET PROFIBUS products and the networks they make up comply with the PROFIBUS standard EN 50170 (1996). The SIMATIC NET PROFIBUS components can also be used with SIMATIC S7 to create a SIMATIC MPI subnet (MPI = Multipoint Interface). Attachable Systems The following systems can be connected: SIMATIC S5/S7/M7/C7 programmable controllers ET 200 distributed I/O system SIMATIC programming devices/PCs SIMATIC operator contro
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PROFIBUS NETWORKS Transmission Media PROFIBUS networks can be implemented with the following: Shielded, twisted pair cables (characteristic impedance 150 Ω ) Shielded, twisted pair cables, intrinsically safe (with PROFIBUS-PA) Fiber-optic cables Wireless (infrared technology) The various communication networks can be used independently or if required can also be combined with each other. PROFIBUS Networks SIMATIC NET 6GK1970-5CA20-0AA1 Release 2 05/2000 1-6
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PROFIBUS NETWORKS 1.2.1 Standards SIMATIC NET PROFIBUS is based on the following standards and directives: IEC 61158–2 to 6: 1993/2000 Digital data communications for measurement and control – Fieldbus for use in industrial control systems EN 50170-1-2: 1996 General purpose field communication system Volume 2 : Physical Layer Specification and Service Definition PROFIBUS User Organization Guidelines: PROFIBUS Implementation Guide to DIN 19245 Part 3 (Draft) Version 1.0 dated 14.12.1995 Fiber O
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PROFIBUS NETWORKS 1.2.2 Access Techniques TOKEN BUS/Master-Slave Method Network access on PROFIBUS corresponds to the method specified in EN 50170, Volume 2 “Token Bus” for active and “Master-Slave” for passive stations. Token rotation (logical ring) Master Master Master Master Master Slave Slave Slave Slave Slave Master = active node Logical token ring Master-slave relationship Slave = passive node Figure 1-1 Principle of the PROFIBUS Medium Access Technique PROFIBUS Networks SIMATIC NET 6GK197
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PROFIBUS NETWORKS Active and Passive Nodes The access technique is not dependent on the transmission medium. Figure 1-1 “Principle of the PROFIBUS Medium Access Technique” shows the hybrid technique with active and passive nodes. This is explained briefly below: All active nodes (masters) form the logical token ring in a fixed order and each active node knows the other active nodes and their order in the logical ring (the order does not depend on the topological arrangement of the active nodes
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PROFIBUS NETWORKS 1.2.4 Transmission Techniques According to EIA Standard RS-485 EIA Standard RS-485 The RS-485 transmission technique corresponds to balanced data transmission as specified in the EIA Standard RS-485 /4/. This transmission technique is mandatory in the PROFIBUS standard EN 50170 for data transmission on twisted pair cables. The medium is a shielded, twisted pair cable. The bus cable is terminated at both ends with the characteristic impedance. Such a terminated bus cable is kno
