Siemens
СРЕДСТВА ПРОМЫШЛЕННОЙ АВТОМАТИЗАЦИИ
официальный партнер Сименс
Каталог СА01 2017
архивный
(4872) 700-366
skenergo@mail.ru

3RS17 Interface Converters

More information

 

For technical specifications, see https://support.industry.siemens.com/cs/ww/en/ps/16692/td

For device circuit diagrams, see https://support.industry.siemens.com/cs/ww/en/view/7734470

For operating instructions see https://support.industry.siemens.com/cs/ww/en/view/7734470

For FAQs, see https://support.industry.siemens.com/cs/ww/en/ps/16692/faq



Active interface converters

Active interface converters provide maximum flexibility for the application by the use of an external control supply voltage. Configuration with active interface converters is extremely easy because input and output resistances and voltage drops are compensated by the auxiliary supply. They support electrical separation as well as conversion from one signal type to another or reinforcement. The load of the measured value transmitter is negligible.

Passive interface converters

Passive interface converters do not require an external control supply voltage. This advantage can only be used by current signals that are converted 1:1. Reinforcement or conversion is not possible. The converters are used for complete electrical separation of current signals and to protect the inputs and outputs. Passive interface converters do not operate reaction-free, i.e. any load on the output produces an equal load on the input signal. When the passive converter is to be used, the output power of the sensor and the input resistance of the analog input must be analyzed.

Calculation guide for passive converters

Important: please note the following when using passive interface converters:

When the output is open, the input becomes high impedance, and the current-driving voltage of the measuring transducer UE must be sufficient to drive the maximum current of 20 mA over the passive converters with a voltage loss of UV = 2.8 V and the load RB.

This means:

UB ? UE = 2.8 V + 20 mA x RB

Distribution of the voltages in the case of passive interface converters

The following figure shows the input voltage UE as a function of the load RB taking into account the voltage loss UV. If the load is known, the y-axis shows the minimum voltage that has to be supplied by the current source in order to drive the maximum current of 20 mA over the passive interface converter and load.

Input voltage depending on the load at Ia = 20 mA

Load rating of the outputs

A maximum output load is specified for current signals. This resistance value specifies how large the input resistance of the next device connected in series can be as a result of the power of the converter.

For voltage signals, the maximum current that can be drawn from the output is the decisive factor.

2-way separation

In the case of 2-way separation, the input is electrically separated from the output. The "zero potential" of the control supply voltage is the same as the reference potential for the analog output signal.

2-way separation

3-way separation

For the 3-way separation, each circuit is electrically separated from the other circuits, i.e. input, output, and control supply voltage do not have equipotential bonding.

3-way separation

Dimensions

Dimensions for 3-way separated analog converter with width 6.2 mm

















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