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II - DCE FEL ČVUT v Praze

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Glossary<br />

DP slave<br />

DP standard<br />

E<br />

Error handling via<br />

OB<br />

Error indication<br />

ET 200<br />

F<br />

Field<br />

Field device<br />

Glossary-4<br />

A slave which is operated on the PROFIBUS with the PROFIBUS-DP<br />

protocol and which complies with EN 50170, Volume 2, PROFIBUS, is<br />

referred to as a DP slave.<br />

The bus protocol of the ET 200 distributed I/O system; it complies with<br />

EN 50170, Volume 2, PROFIBUS.<br />

When the operating system detects an error (for example, STEP 7 access<br />

error), it calls the specific organization block (error OB) for this error,<br />

where the further response of the CPU can be specified.<br />

One of the possible responses of the operating system to a delay error. The<br />

other possible responses are: error response in the user program, STOP<br />

status of the IM 153.<br />

The ET 200 distributed I/O system with the PROFIBUS-DP protocol is a bus<br />

designed for connecting distributed I/O units to a CPU or a suitable DP<br />

master. ET 200 is distinguished by its fast response times, since only small<br />

volumes of data (bytes) are transferred.<br />

ET 200 is based on EN 50170, Volume 2, PROFIBUS.<br />

ET 200 operates according to the master-slave principle. The DP master may<br />

be an IM 308-C master interface, for example, or a CPU 315-2 DP.<br />

The DP slaves may be distributed I/O units (ET 200B, ET 200C, ET 200M,<br />

ET 200U) or DP slaves from Siemens or other vendors.<br />

Either, an area of a plant outside the control room where measured values can<br />

be acquired through communication or manipulated values can be sent to<br />

actuators.<br />

Or part of a message, for example an address field or command field, which<br />

has been allocated a particular function. The size or other rules for the<br />

interpretation of each field are part of the protocol specification.<br />

A transducer which is located in the field and exchanges data with the<br />

CPU via communication.<br />

I/O Modules with Intrinsically-Safe Signals<br />

C79000-G7076-C152-04

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