Driving 4V210-08 Directly with Low-Power PLC Outputs

May 3, 2026

PLC Direct Drive: Is the Airtac 4V210-08 Compatible with Your Controller?

In modern industrial automation, the trend is toward "Direct Drive"—connecting solenoid valves directly to PLC outputs without intermediate relays. While this saves space and cost, it requires careful calculation of current draw and surge protection. Does the Airtac 4V210-08 meet the requirements of today’s compact micro-PLCs?

1. Electrical Load Analysis: The 125mA Standard

The most critical factor for a PLC output is the Continuous Current Rating.

The Math: A standard Airtac 4V210-08 DC24V coil operates at 3.0W, which draws approximately 125mA of current.
PLC Compatibility: Most modern Transistor (Source/Sink) outputs, such as those on the Siemens S7-1200, Mitsubishi FX Series, or Allen-Bradley Micro800, are rated for 0.5A (500mA) per point.
The Verdict: The 4V210-08 operates well within the safety margin, utilizing only 25% of a typical output’s capacity. This allows for reliable high-speed switching without overheating the PLC’s internal circuitry.

2. Protecting Transistors from Inductive "Kickback"

Every time the PLC turns off the 4V210-08, the solenoid coil’s collapsing magnetic field generates a high-voltage spike, known as Back EMF.

The Risk: Without protection, this spike can eventually "punch through" the PLC’s delicate output transistors, leading to a permanent "always-on" failure.
The Solution (Suffix -Z): When sourcing from Airtac-Shop.com, always specify the -Z Suffix (e.g., DC24V-Z). This coil features a built-in Varistor or Zener Diode that clamps the surge locally, ensuring your PLC remains isolated from electrical noise.

3. Simultaneous Load and Duty Cycle

If your manifold has 10 valves firing simultaneously, ensure your PLC’s Common Terminal can handle the cumulative 1.25A load. For high-duty cycle applications, the low-wattage 3.0W design of the Airtac 4V series is superior to older 5W-8W models, as it significantly reduces the heat signature inside your electrical cabinet.

Seamless Automation Starts Here

Don't risk your controller’s lifespan on unverified hardware. Trust the Airtac 4V210-08 for its proven electrical efficiency and long-term PLC compatibility. For PLC-ready valves, surge-suppressed coils, and technical support, visit Airtac-Shop.com.