Protecting PLC Outputs When Driving 4V210-08 Valves

Industrial Safety: Surge Suppression for 4V210-08 Circuits

Driving an Airtac 4V210-08 directly from a PLC? Without proper surge protection, the "Flyback Voltage" will eventually fry your PLC transistor outputs.

1. The Inductive Spike

When the 4V210-08 coil de-energizes, the collapsing magnetic field creates a voltage spike that can reach hundreds of volts.

2. Three Ways to Protect Your PLC

• Airtac Built-in Protection: Choose coils with the "Z" suffix (e.g., DC24V-Z) which include a built-in Zener diode.
• Flyback Diodes: If using lead-wire coils, install a 1N4007 diode across the terminals.
• RC Snubbers: Ideal for AC220V models to reduce electrical noise on the control line.

Invest in protection now to avoid the $500 cost of a new PLC card later.