Proximity switches for C-slots are available as reed and electronic variants.
Electronic switches are generally the preferred solution for all factory automation applications, in particular with high cycle rates. The most universal switch series is the SMT-10M.
Reed switches are an alternative for simpler applications with, for example, lower cycle rates. Reed switches can be used universally as PNP, NPN and are the only way of implementing position feedback as a potential-free contact. In this case, the SME-10M is the preferred standard solution.