Product Category

Direct Discrimination Unit


Detects the Rotary Encoder Direction

Direct Discrimination Unit



Power supply voltage

12 VDC -10% to 24 VDC +15%, ripple (p-p): 5% max.

Current consumption

50 mA max.


Input signal

Phases A, B, and Z (phase difference signals)

Phase difference

90° ±45° max.


6 mA max. at 0 to 2 V


1.5 mA max. at 8 to 24 V

Input short current

9 mA

Max. applied voltage

30 V max.

Input impedance

Approx. 1 Ω


Output signal

UP/DOWN (direction detection), COUNTS output (count), OUT Z

Output configuration

Open-collector output

Output capacity

Applied voltage: 30 VDC max.
 Sink current: 80 mA max.
 Residual voltage: 1 V max. (at sink current of 80 mA)
 Residual voltage: 0.4 V max. (at sink current of 20 mA)

Maximum response frequency

120 kHz

Output response time

2 μs max.


Power indicator (red), Phase Z output indicator (green)

Ambient temperature range

Operating: -10 to 55°C (with no icing), Storage: -25 to 80°C (with no icing)

Ambient humidity range

Operating/Storage: 35% to 85% (with no condensation)

Vibration resistance

Destruction: 10 to 55 Hz, 1.5-mm double amplitude for 2 hours each in X, Y, and Z directions

Shock resistance

Destruction: 300 m/s2 3 times each in X, Y, and Z directions

Connection method

Terminal block


Case: ABS

Weight (packed state)

Approx. 100 g


Instruction manual (S3D8 Connector is not provided.)