Providing Profibus With Terminating Resistance; Figure 3-3 Rotary Switches (Tens On Left-Hand Switch, Ones On Right-Hand Switch) - Siemens SIMATIC ET 200R Manual

Installation
Attention
The metric PG covering caps and the seals must be in perfect condition. Otherwise
protection rating IP65 is no longer ensured!
Attention
Do not use the metric covering caps to cover the actuator/sensor connections.
Using the rotary switches
The rotary switches are adjusted with a screwdriver. The point of the arrow indi-
cates the setting.
Figure 3-3
Changing the PROFIBUS address
The PROFIBUS address is changed using the same procedure you used to set the
address the first time. A changed PROFIBUS address does not take effect until
POWER-OFF/ON on the ET 200R.
3.3

Providing PROFIBUS with terminating resistance

Purpose of the terminating resistance
Both ends of a bus cable (i.e., on the first station and the last station of the net-
work) must be terminated with its impedance.
Due to the implemented repeater function this terminating resistance is perma-
nently integrated on the ET 200R for each bus segment. This means that, when the
ET 200R is used as the first or last module in a segment, no external terminating
resistance is required.
3–4
Tens
Rotary switches (tens on left-hand switch, ones on right-hand switch )
5 5
Ones
Distributed I/O Device ET 200R
(4)J31069-D0427-U001-A2-7618