What type of output is typically used with safety interlocks in PLCs?

Discrete output is typically used with safety interlocks in programmable logic controllers (PLCs) because safety interlocks require a binary presence or absence of a signal to effectively control safety mechanisms. Discrete outputs operate in a two-state manner—either on or off—making them ideal for applications where specific conditions must trigger a safety response. For example, when a safety condition is met, the discrete output can activate a safety relay or shutdown a system to prevent accidents or equipment damage.

This binary nature ensures reliability and quick response in critical situations, which is essential in safety applications. The discrete output provides clear, unambiguous signals that can be easily integrated into safety systems, making it a preferred choice for implementing interlocks that ensure the safe operation of machinery and equipment.