DS-48 pulse counter – 2× displays, 2 inputs, relay output

Product description

The DS-48 pulse counter is a universal two-input panel counter equipped with two 4-digit LED displays (current value + target value). It can count, subtract, and process signals from mechanical switches, PNP/NPN inductive sensors, and incremental encoders. Its wide selection of input and output functions makes it suitable for industrial automation systems, production lines, measuring stations, and process control.

Key features

• 2× 4-digit, 7-segment LED displays

• 1× OUT relay output + SSR output

• Multiple modes: counting, down-counting, addition from multiple inputs, control via the second input

• Supports mechanical switches, PNP/NPN sensors, and encoders

• Selectable input frequency: 20 / 50 / 2500 / 7500 Hz

• Hesla settings protection

• EEPROM memory – data retention in the event of a power outage

• Option to set OFFSET and the decimal point

• Automatic restoration of the last value after a power outage

Function

Input function (7 modes):

• Up-counting

• Down-counting

• Addition from two inputs simultaneously

• Pause controlled by the second input

• Input negation

• Counting on the rising / falling edge

• Combinations: addition from one edge, subtraction from the other, negation, etc.

Output functions (9 modes):

• Relay activation after reaching the target

• Maintains state during RESET

• Pulse output 0.1–999.9 s

• Control via SSR output (NPN)

Technical parameters

Display and dimensions

• Dimensions: 48 × 48 × 96 mm

• Mounting cutout: 44 × 44 mm

• Display: 2 × 4-digit LED

Inputs

• Number of inputs: 2

• Input types: mechanical switch, PNP/NPN sensor, NPN/PNP/totem-pole encoder output

• Input voltage: 5-30 V

• Maximum input frequency: 7500 Hz

• Selectable frequencies: 20 / 50 / 2500 / 7500 Hz

• Reset input: PNP, min. 10 ms, terminal 12

• Sensor supply: 12 VDC / 50 mA (max.)

Outputs

• 1× SPDT relay, 250 VAC, 2 A (resistive load) - COM (4), NO (3), NC (5)

• 1× SSR control (NPN, max. 100 mA, 30 V) - terminals 13 (SSout), 14 (GND)

Power supply

• 100-240 V AC, 50/60 Hz

• Power consumption: < 8 VA

Operating conditions

• Operating temperature: -20 °C to +55 °C

• Maximum altitude: 2000 m

Special features

• EEPROM memory stores all settings and current counts after a power interruption

• Adjustable OFFSET of the counter value

• Password protection against unwanted parameter changes

• Selectable decimal point (0 / 0.0 / 0.00 / 0.000)

Installation recommendations

• Use shielded, twisted signal cables; ground the shield

• Separate signal cables from power supply and power cables

• Use an F250 mA / 250 VAC fuse at the power input

• Protect the equipment from moisture, vibration, dust, and extreme temperatures

• For mechanical switches, setting the input frequency to 20 Hz is recommended

• When using two inputs:

• Phs4 mode → max. ¼ input frequency

• 1u2u, 1u2d, Phs2 modes → max. ½ input frequency