EM-M17B is a frequency-to-analog converter that converts a pulse-frequency signal into either a 0–10 V voltage signal or a 4–20 mA current signal.
The converter supports several commonly used industrial sensor types, including NPN and PNP open-collector sensors, NAMUR sensors and voltage-pulse sources. The required frequency range and input configuration are selected using DIP switches.
The EM-M17B converts the measured input frequency into a proportional analog output signal. The output can be configured for either:
The selected full-scale frequency corresponds to the upper end of the selected analog output range.
Three full-scale frequency ranges are available:
The required range is selected using DIP switches, allowing the output signal to be matched to the frequency range of the connected sensor or pulse source.
The input stage can be configured for several commonly used sensor and signal types:
Voltage-pulse signals from 4 to 25 V can be connected to the pulse input. The specified input impedance is approximately 2 kΩ.
The EM-M17B provides an integrated supply for external sensors:
The frequency input can be optically isolated when an external sensor supply is used and the specified configuration switch is left open. This allows the pulse source to be electrically separated from the converter’s supply circuit.
The converted analog signal is filtered using a second-order filter. The filter attenuates ripple caused by the discrete incoming pulses and produces a smoother analog output signal.
The analog output is protected against short circuits and overloads. The operating-voltage input is protected against incorrect polarity.
| Operating voltage | 20–32 VDC |
|---|---|
| Maximum current consumption | 50 mA |
| Input configurations | NPN open collector, PNP open collector, NAMUR or isolated voltage pulse |
| Voltage-pulse input range | 4–25 V |
| Voltage-pulse input impedance | Approx. 2 kΩ |
| Sensor supply | 15 VDC |
| NAMUR sensor supply | 8.5 VDC |
| Frequency range 1 | 0–200 Hz |
| Frequency range 2 | 0–500 Hz |
| Frequency range 3 | 0–1000 Hz |
| Voltage output | 0–10 V |
| Current output | 4–20 mA |
| Output filtering | Second-order filter |
| Linearity error | typ. 0.1% |
| Thermal drift | < 100 ppm/°C |
| Output protection | Short-circuit and overload protected |
| Supply protection | Reverse-polarity protected |
Ordering larger quantities +100pcs.
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