Glossary
Glossary-6
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Segment
The bus line between two terminating resistors forms a segment. A segment
contains 0 to 32
nodes. Segments can be interconnected by means of RS 485
repeaters.
Slave
A slave can only exchange data with a
master when requested by it to do so. By
slaves we mean, for example, all DP slaves, such as ET 200B, ET 200X, ET 200M
etc.
Station number
→
PROFIBUS address
SYNC
This is a control command of the DP master to a group of DP slaves.
By means of the SYNC control command the DP master causes the DP slave to
freeze the current statuses of the outputs. In the subsequent frames, the DP
slave stores the output data, but the statuses of the outputs remain unchanged.
After each new SYNC control command, the DP slave sets the outputs that it has
stored as output data. The outputs are not cyclically updated again until the DP
master sends the UNSYNC control command.
Terminating resistor
The terminating resistor is a resistor for adjusting the power on the bus cable;
terminating resistors must be used on the cable and segment ends.
The terminating resistors in the ET 200X are switched on and off in the basic
module.
The ET 200X-DESINA connects to the bus by means of a fiber-optic waveguide,
so no terminating resistors are required.
Transmission rate
The transmission rate of a data transfer is measured in bits transmitted per
second (transmission rate = bit rate).
In the case of the ET 200X, transmission rates of 9.6 kbps to 12 Mbps are
possible.
Summary of Contents for SIMATIC ET 200X
Page 8: ...Preface viii ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 20: ...Contents xx ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 40: ...Product Overview 1 20 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 58: ...Configuration Options 2 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 80: ...Installation 3 22 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 124: ...Configuration Options 2 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 328: ...Order Numbers A 10 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 348: ...Dimesioned Drawings and Pinouts C 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 362: ...Index Index 8 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...