The magnetic switch cannot be positive-opening by its design. The operation is considered a “complementary” action; one channel is always open and one channel is always closed.

To increase the safety circuit integrity of your magnetic interlocking switch, a magnetic controller or safety module is used to:

• Provide monitoring for contact failure (where the contacts are no longer in opposite states), and to prevent the machine from restarting if the switch should fail.
• Provide a reset routine so that the machine doesn’t simply restart when the guard is closed.
• Provide a means for External Device Monitoring (EDM).
• Provide protective safety stop circuits.
• Self-monitors for internal faults.