I'm looking for any guidelines and/or tools to use in sizing the 24Vdc power supply for a safety PLC which uses an energize to trip philosophy. In addition, is there any derating that could be done on such a system, or does one have to look at the worst case scenario (i.e. all inputs and...
We are installing several photo eyes on a conveyor system to detect if there is a package backup on the conveyor. In the past I have used YS as the indentification for this (event, state, presence), but on this particular project some other ideas are being passed around (ZS). What ISA...
I would say that typically, a multivariable transmitter would be a good option, but for this application we are looking at SIL rated transmitters. So far, I haven't come across any multivariable which are SIL rated.
Shaun
Has anyone had any experience in performing P&T compensation for a flow
trip in a SIL application? Our process currently employs a 2oo2 voting scheme for tripping using 2 SIL rated DP transmitters on an orifice plate. We are contemplating adding P&T compensation on these trips and are trying to...
