D1600M Modbus Modules with Frequency Input


The D1600M modules measure frequency signals from sensors between 1hz-20Khz. Both unipolar and bipolar frequency signals can be measured. The module conditions the signal, converts it to digital data and linearizes the value into a 16-bit unsigned integer data format that represent a percentage of the frequency input range. The data values are transmitted to a host computer using the Modbus RTU serial protocol via an RS-232 or RS-485 serial port.

The D1600M frequency input modules contain one discrete digital input for monitoring contact closures or switches. The discrete digital inputs can accept +/-30Vdc signals without damage.  The discrete switching levels are <+1Vdc = logic “0”, >+3.5Vdc equals a Logic “1”.

Because the Modbus protocol does not support Echoing the RS-232 versions of D1000M series are limited to one module per serial port. Applications requiring more than one module should use RS-485.

Use the links below to download a Datasheet, User’s Manual or view the Modbus Scaling Example.

Download Datasheet

Download Manual

Modbus Scaling Overview

The D1600M series modules can also be mounted on a DIN-Rail using the MK-1 mounting kit.

Additional information

Dimensions 3.6 × 2.45 × 1.1 in

• Input Impedance: 1megohm min.
• Switching Level: selectable 0V, +2.5V.
• Hysteresis: Adjustable 10mV to 1.0V.
• Input protection to 250Vac.
• One digital input.

Accumulator Input

• Pulse count: Up to 10 million positive transitions.
• Resolution: 0.005% of reading + 0.01Hz (frequency).
• Resolution: 0.005% of reading plus 0.01uS (timer).
• Accuracy: +/-0.01% of frequency reading +/-0.01Hz.
• Accuracy: +/-0.01% of timer reading plus 10uS.
• Tempco: +/-20ppm/deg C.

Frequency Inputs

• Resolution: 0.005% of reading + 0.01Hz.
• Accuracy: +/-0.01% of reading plus +/-10uS.
• Tempco: +/-20ppm/deg C.

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