SIEMENS
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Siemens IC 10 · 2017
Relays
Coupling Relays and Signal Converters/Interface Converters
SIRIUS 3RS70 signal converters
10
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Benefits
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Narrow width
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Easy-to-set universal converters
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Converters with frequency output
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All ranges are fully calibrated
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Universal family of devices – the perfect solution for every
application
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Integrated manual/automatic switch with a setpoint generator
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Outputs are short-circuit-proof
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Up to 30 V – protected against damage caused by wiring
errors
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Application
Signal converters are used in analog signal processing for
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Electrical separation
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Conversion of normalized and non-normalized signals
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Amplification and impedance adaptation
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Conversion to a frequency for processing by a digital input
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Overvoltage and EMC protection
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Short-circuit protection of the outputs
3RS7025 manual/automatic converter
For special applications in which analog signals have to be
simulated, or during plant commissioning when the actual
process value is not yet available, the 3RS7025 devices feature
an adjustable potentiometer for manual setpoint selection and
a manual/automatic switch.
The potentiometer for the 3RS7025 devices is used to simulate
analog output signals when the changeover switch is set to
"Manual" and the control supply voltage is applied, without
the need for an analog input signal. The scale ranges from
0 ... 100 %.
Example: When it is set for an output of 4 ... 20 mA, the left stop
on the potentiometer represents an output current of 4 mA and
the right stop represents an output current of 20
mA. In the "Auto"
switch position, the output signal follows the input signal propor-
tionally regardless of the potentiometer setting.
Application example of analog signal processing
IC01_00425a
Sensor/analog
value generator
3RS70 converter
Electronic control
Output
Input
3RS70 converter
Actuator with
analog input
0 ... 10 V
0/4 ... 20 mA
0 ... 10 V
0/4 ... 20 mA
0 ... 10 kHz
0 ... 10 V
0/4 ... 20 mA
0 ... 10 V
0/4 ... 20 mA
© Siemens AG 2016