Siemens SIMATIC NET PROFIBUS manual Token ring, Token rotation time

Glossary

Token ring

All the masters physically connected to a bus receive the token and pass it on to the next master: the masters are located in a token ring.

Token rotation time

is the time that elapses between receiving the ³ token and receiving the next token.

Transmission rate

The transmission rate specifies the number of bits transferred per second. On PROFIBUS, transmission rates of 9.6 Kbps to 12 Mbps are possible.

TRDY

Indicates readiness to acknowledge or respond (ready time)

TSET

Setup time. The setup time is the time that can elapse between receiving a data frame and reacting to it.

TSL

The wait to receive time (slot time) is the maximum time that can elapse while the sender waits for a response from the addressed station.

TTR

Target rotation time. Each master compares the target rotation time with the ac- tual token rotation time. The difference between the two decides how much time the DP master has available to send its own data frames to the slaves.

PROFIBUS Networks SIMATIC NET	Glossary-7
6GK1970-5CA20-0AA1 Release 2 05/2000