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| | | Interface PROFIBUS-DP Absolute Position Values | | |
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| | | EMMEW | | |
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| | | PROCESS HELD BUS | | |
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| | | PROFIBUS-DP PROFIBUS is a nonproprietary, open field bus in accordance with the international EN 50170 standard. The connecting of sensors through field bus systems minimizes the cost of cabling and reduces the number of lines between encoder and subsequent electronics. Topology and bus assignment The PROFIBUS-DP is designed as a linear structure. It permits transfer rates up to 12 Mbps. Both mono-master and multi master systems are possible. Each master can serve only its own slaves (polling). The slaves are polled cyclically by the master Slaves are, for example, sensors such as absolute rotary encoders, linear encoders, or also control devices such as motor frequency inverters. Physical characteristics The electrical features of the PROFIBUS-DP comply with the RS-485 standard. The bus connection is a shielded, twisted two-wire cable with active bus terminations at each end | | |
| | | E. g.: LC 183 absolute linear encoder | | E.g.: ROQ425 multiturn rotary encoder Ш■ Slave 3 E.g.: ROC413singleturn rotary encoder | | |
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| | | I Slave 1 : | | |
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| | | Slave 5 | | |
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| | | PROFIBUS-DP | | |
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| | | ^Gateway | | |
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| | | Slave 2 | | |
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| | | Master 1 | | |
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| | | E.g.: Frequency nverterwith motor | | |
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| | | Slave 4 | | |
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| | | \ E.g.: RCN 729 absolute angle encoder | | |
| | | L __________ | | |
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| | | Bus structure of PROFIBUS-DP | | |
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| | | Self-configuration The characteristics of the HEIDENHAIN encoders required for system configuration are included as "electronic data sheets" — also called device identification records (GSD) — in the gateway. These device identification records (GSD) completely and clearly describe the characteristics of a unit in an exactly defined format. This makes it possible to integrate the encoders into the bus system in a simple and application-friendly way. Configuration PROFIBUS-DP devices can be configured and the parameters assigned to fit the requirements of the user. Once these settings are made in the configuration tool with the aid of the GSD file, they are saved in the master. It then configures the PROFIBUS devices every time the network starts up. This simplifies exchanging the devices: there is no need to edit or reenter the configuration data | | |
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| | | * with EnDat interface | | |
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