1.2 Expansion Options Of The Et 200 Distributed I/O System; Structure Of A Bus Segment; Permissible Cable Length Of A Bus Segment As A Function Of Baud Rate - Siemens SIMATIC S5 Manual

1.2 Expansion options of the ET 200 distributed I/O system

What is a bus The ET 200 distributed I/O system consists of at least one bus segment. If the
segment? ET 200 consists of only one bus segment, this segment has at least two
stations, one of which is a DP master.
A bus segment can consist of up to 32 stations, all physically connected by a
bus cable.
Maximum A bus segment consists of max. 32 stations. You must insert a terminating
configuration of a resistor at the start and end of the bus.
bus segment
Figure 1-1
Cornerstone data You can interconnect a maximum of 32 stations in a single bus segment.
for a bus segment
The maximum physical length of a bus segment depends on the baud rate
used (see Table 1-1).
Table 1-1 Permissible cable length of a bus segment as a function of baud rate
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Master No. 6
Slave No. 10 Slave No. 13
: Station (master or slave)
: Station with terminating resistor in circuit

Structure of a bus segment

Baud rate Max. cable length of a segment (in meters)
9.6 to 187.5 kbaud
500 kbaud
1.5 Mbaud
3 to 12 Mbaud
System overview
Master No. 20
Slave No. 64
1000
400
200
100
1-5
1