nasrollahi
Member
Hello everybody,
I am going to select a proper DCS system for LPG plant, According to design philosophy the redundancy for closed loop I/O is not necessary. But according to spec:
" Accuracy Requirements
The accuracy requirements for process controller analogue inputs shall be +/- 0.1 % minimum, and +/- 0.3% for analogue output. For control, analogue-to-digital and/or digital to analogue converter shall be dedicated to each input/output point, otherwise a redundant design shall be provided."
Please advice me, shall above mentioned para. be considered as main reason for redundancy? or, there is better reason for redundancy in close loop I/O’s.
What is the common practice?
Is there any standard in this regard?
Dose it depend on manufacturer standard, normally?
Sasan
I am going to select a proper DCS system for LPG plant, According to design philosophy the redundancy for closed loop I/O is not necessary. But according to spec:
" Accuracy Requirements
The accuracy requirements for process controller analogue inputs shall be +/- 0.1 % minimum, and +/- 0.3% for analogue output. For control, analogue-to-digital and/or digital to analogue converter shall be dedicated to each input/output point, otherwise a redundant design shall be provided."
Please advice me, shall above mentioned para. be considered as main reason for redundancy? or, there is better reason for redundancy in close loop I/O’s.
What is the common practice?
Is there any standard in this regard?
Dose it depend on manufacturer standard, normally?
Sasan
Last edited: