Safety switch operating method, involves transmitting impulse by controller over contact, where controller waits for return impulse at another contact for retrieving information about switching position of switching units between contacts

摘要

The method involves connecting output contacts (3, 6) of electronic switches (4, 7) with a controller (8) and an electric load, where the controller switches the switches. A test impulse is transmitted by the controller over one of the contacts, where the controller waits for a return test impulse at the other contact for retrieving information about a switching position of switching units (32, 33) between the contacts. A time between a raising slope and a falling slope of the return test impulse is detected by the controller. An independent claim is also included for a safety switch with electronic switches including output contacts.