DS-48 pulse counter - 2× display, 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, measurement stations, and process control.

Main features

• 2× 4-digit 7-segment LED display

• 1× relay output OUT + SSR output

• Multiple modes: counting, countdown, addition from multiple inputs, control via second input

• Support for mechanical switches, PNP/NPN sensors, and encoders

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

• Hesla configuration protection

• EEPROM memory - data retention in case of power failure

• Option to set OFFSET and decimal point

• Automatic restoration of last value after power failure

Functions

Input function (7 modes):

• Count up

• Countdown

• Simultaneous addition of two inputs

• Pause controlled by second input

• Input negation

• Counting from rising/falling edge

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

Output functions (9 modes):

• Relay trigger after reaching target

• Hold for RESET

• Pulse output 0.1-999.9 s

• Control via SSR output (NPN)

Technical parameters

Display and dimensions

• Dimensions: 48 × 48 × 96 mm

• Mounting hole: 44 × 44 mm

• Display: 2 × 4-digit LEDs

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 power 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 VAC, 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 power failure

• Adjustable OFFSET of the count value

• Password protection against unwanted parameter changes

• Selectable decimal point (0 / 0,0 / 0,00 / 0,000)

Installation recommendations

• Use shielded and twisted signal cables, connect the shielding to ground

• Separate signal wires from power and supply cables

• Use a F250 mA / 250 VAC fuse on the power input

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

• For mechanical switches, it is recommended that the input frequency be set to 20 Hz

• When using two inputs:

• Phs4 mode → max. ¼ input frequency

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