SIEMENS
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Siemens IK PI · 2015
PROFIBUS
Electrical networks (RS485)
Active RS 485 terminating element
3
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Overview
•
Terminates bus segments at data transmission rates of
9.6 kbit/s to 12 Mbit/s
•
Power supply independent of bus stations.
Designed for Industry
•
Terminal-independent bus termination through onboard
power supply
■
Application
The active RS 485 terminating resistance is used to terminate
bus segments. Power supply is independent of the stations. The
terminating resistor is supplied with power separately from the
other I/O components, either permanently or with a voltage
applied ahead of the I/Os. By terminating the bus system the
stations (e.g. ET 200S) can be coupled and decoupled selec-
tively without malfunctions.
■
Design
•
1 terminal block for the segment connection
•
Terminal block for power supply (24 V DC external)
■
Function
The active RS 485 terminating element terminates the
PROFIBUS and therefore ensures a defined level of the
RS 485 signal and suppression of reflections on the line. Since
it is operated independently of the field devices, they can be
decoupled from the bus without reactions.
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Technical specifications
■
Ordering data
Article No.
■
More information
Brochures
Information material for downloading can be found in the
Internet:
6ES7972-0DA00-0AA0
Supply voltage
24 V DC
Yes
permissible range, lower limit (DC)
20.4 V
permissible range, upper limit (DC)
28.8 V
Input current
Current consumption, typ.
30 mA
Interfaces
Bus cables
Screw terminal block
PROFIBUS DP
• Transmission rate, max.
12 Mbit/s; 9.6 kbit/s to 12 Mbit/s
Degree and class of protection
IP20
Yes
Ambient conditions
Operating temperature
• Min.
0 °C
• max.
60 °C
Storage/transport temperature
• Min.
-40 °C
• max.
70 °C
Relative humidity
• max. relative humidity
95 %; at +25 °C
Connection method
Power supply
Screw terminal block
Dimensions
Width
60 mm
Height
70 mm
Depth
43 mm
Weights
Weight, approx.
95 g
Active RS 485 terminating
element for PROFIBUS
6ES7972-0DA00-0AA0
to complete bus segments
for transmission rates of
9.6 kbit/s to 12 Mbit/s
© Siemens AG 2014