I'm considering using the A-B SensaGuard non-contact safety switches as a replacement for the A-B Sipha sensors. My main concern is the accumulated response time of the SensaGuard switches when several are used on the same safety relay (sometimes we have 15 or more switches on the same relay). My understanding is the first switch is 54ms and every switch thereafter adds 18ms to the drop out time of the safety relay outputs depending on where the switch is in the circuit. The thought of potentially adding a 500 ms response time to our safety circuit has me somewhat concerned. Our machines are not extremely fast but it’s just the thought of going from almost instantaneous stop to worrying about response time calculations and what not. As anyone used these switches extensively? I would greatly appreciate any thoughts or concerns regarding there performance, reliability, pro’s and con’s?