These are used to manage basic safety functions, such as emergency stops or safety door monitoring. They usually have a limited number of built-in safety contacts. These modules add more instantaneous (normally open) contacts to the existing base unit. This expansion is crucial when the base unit’s native contact count is insufficient for the application’s needs.
These are more advanced units that offer a broader range of safety functions and often include feedback loop monitoring. http://www.pilz.com This monitoring ensures the integrity of safety functions by checking the status of connected safety devices and circuits. Safety solutions provider since 2011.