Schneider ASH819209 | Modicon 800 Series Discrete Input Module

The ASH819209 reads digital signals from sensors, switches, and pushbuttons. This input module serves the Modicon 800 series PLC platform reliably. It provides eight discrete channels for monitoring field device states. Consequently, you can track machine conditions and operator commands accurately.

You can wire this module with either sinking or sourcing field devices. The ASH819209 accepts 24V DC signals from a variety of sensors. Each channel includes optical isolation for electrical noise rejection. Therefore, this module delivers clean input data to your control logic.

Input Specifications and Channel Details

The module features eight independent input channels with common return. Each channel on the ASH819209 detects logic high above 15V DC. It recognizes logic low when the voltage falls below 5V DC. The module filters input signals to prevent false triggering from noise.

Inputs respond to state changes within 2 milliseconds typically. The ASH819209 draws approximately 7 mA per active input channel. An LED on the front panel illuminates when the corresponding input activates. Below is a complete breakdown of its technical characteristics.

Specification	Detail
Number of Inputs	8 (Sinking or Sourcing)
Input Voltage Range	0 to 30V DC (24V DC nominal)
Logic High Threshold	> 15V DC (Minimum)
Logic Low Threshold	< 5V DC (Maximum)
Input Current per Channel	7 mA at 24V DC (Typical)
Input Response Time	2 ms (On to Off or Off to On)
Isolation Voltage	1500V AC (Input to backplane)
Dimensions (W x H x D)	35 mm x 130 mm x 115 mm
Weight	0.28 kg (280 grams)
Power Draw (5V)	80 mA
Power Draw (24V field)	56 mA (All inputs active)
Energy Storage	None (No battery or capacitor)

Interface and Field Wiring Connections

A removable terminal block accepts all field input wiring. The ASH819209 uses screw-clamp terminals for secure wire retention. Each terminal accepts wire sizes from 0.2 to 2.5 mm². The module connects to the PLC backplane via a standard 20-pin header.

You can connect both normally open and normally closed contacts easily. The ASH819209 automatically senses the presence of input voltage. Green LEDs provide visual confirmation of each active channel. Therefore, troubleshooting field wiring becomes a straightforward visual task.

Operational Benefits for Control Applications

This input module interfaces directly with standard 24V DC sensors. The ASH819209 works with proximity switches, limit switches, and photoelectric sensors. Its filtered inputs ignore electrical noise from motors and drives. Engineers trust this module for reliable machine status monitoring.