요청 내용
“Create an interlocked valve ladder with open and close pushbuttons, seal-in contacts, a normally closed emergency stop, a valve B closed permissive, and separate open and close outputs for valve A.”
그렇다면Add open and closed limit switches for valve A.Add an alarm output for emergency stop.
이 도면에 담긴 내용
그 이면의 의사결정을 읽어 보세요.
01
Seal-in logic for maintained command using parallel branched contacts
02Cross-cancellation
open pushbutton drops close command and vice-versa
03
Series XIO contacts for emergency stop and permissive interlock (valve B closed limit)
Any process automation where safe valve sequencing is critical, e.g., chemical dosing, water treatment, pharmaceutical batch control.