Siemens SIMATIC NET PROFIBUS MaxTSDR, MinTSDR, Node, Optical power budget FO, Profibus address

Glossary

Max_TSDR

Max_TSDR is a bus parameter and specifies the maximum protocol processing time of the responding node (station delay responder).

Min_TSDR

Min_TSDR is a bus parameter and specifies the minimum protocol processing time of the responding node (station delay responder).

Node

A device that can send and receive data on PROFIBUS as a master or slave.

Optical power budget (FO)

This is available between a sender and receiver on a fiber-optic link. It indicates the difference between the optical power coupled into a particular fiber by the optical transmitter and the input power required by an optical receiver for reliable signal detection.

Optical power loss (FO)

The optical power loss is the cumulative value of all the losses occurring in the fiber-optic transmission path. These are due mainly to the attenuation of the fiber itself and the splices and couplings. The optical power loss must be less than the optical power budget available between the transmitter and receiver.

PROFIBUS

PROcess FIeld BUS, European process and fieldbus standard specified in the PROFIBUS standard (EN 50 170, Volume 2, PROFIBUS).

This specifies the functional, electrical and mechanical characteristics of a bit-se- rial fieldbus system.

PROFIBUS is a bus system that networks PROFIBUS-compatible automation systems and field devices at the cell and field level. PROFIBUS exists with the DP protocol (= Distributed Peripheral I/Os), FMS protocol (= Fieldbus Message Specification) or PA protocol (= Process Automation).

PROFIBUS address

To identify it uniquely, every station must be assigned a PROFIBUS address. A PC/PG or the ET 200 Handheld have the PROFIBUS address ”0”.

Master and slaves have a PROFIBUS address in the range 1 to 125.

Glossary-4	PROFIBUS Networks SIMATIC NET
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