NAMUR NE 43 APPLICATION ON AI880
Dear Expert,
We tried to applied NAMUR standar on Analog Input AI880. I still have doubt regading namur behaviour. I tried to simulate signal with summary like this :
- When signal range in 3.76 - 20.65 no error channel and alarm appear (HH,H,L,LL)
- When signal detect underrange ( 3.58 - 3.76 ma) and overrange signal (20.65 - 21.2), channel warning underrange or overrange, alarm OK (HH,H,L,LL)
- When signal error (under 3.58 or over 21.2), channel error and alarm still appear (HH,H,L,LL).
I tried to simulate channel using 2 injector from normal signal go to signal error (under 3.58 mA) suddenly using selector switch, but alarm still appear.
So I tried to use predetermine value, to hold value when channel goes to error. But this value is activate after 5-6 s, After this time alarm will be back to RTN.
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My questions :
1. Is this correct behaviour, when channel detect from normal signal to error signal suddenly, it will generate alarm (HH,H,L,LL) beside channel error ?. My perception, is only channel error will be generated.
2. Can we set predetermine value timing to make signal normal under 5-6 s.
Regards,
DZ
We tried to applied NAMUR standar on Analog Input AI880. I still have doubt regading namur behaviour. I tried to simulate signal with summary like this :
- When signal range in 3.76 - 20.65 no error channel and alarm appear (HH,H,L,LL)
- When signal detect underrange ( 3.58 - 3.76 ma) and overrange signal (20.65 - 21.2), channel warning underrange or overrange, alarm OK (HH,H,L,LL)
- When signal error (under 3.58 or over 21.2), channel error and alarm still appear (HH,H,L,LL).
I tried to simulate channel using 2 injector from normal signal go to signal error (under 3.58 mA) suddenly using selector switch, but alarm still appear.
So I tried to use predetermine value, to hold value when channel goes to error. But this value is activate after 5-6 s, After this time alarm will be back to RTN.
My questions :
1. Is this correct behaviour, when channel detect from normal signal to error signal suddenly, it will generate alarm (HH,H,L,LL) beside channel error ?. My perception, is only channel error will be generated.
2. Can we set predetermine value timing to make signal normal under 5-6 s.
Regards,
DZ
Asked 1 month ago
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