Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / carl_ellis
What is Foundation Fieldbus LAS?
Link Active Scheduler (LAS)
A Link Active Scheduler (LAS) is a deterministic,
centralized bus scheduler that maintains a list of
transmission times for all data buffers in all devices that
need to be cyclically transmitted. Only one Link Master
(LM) device on an H1 fieldbus Link can be functioning as
that link's LAS.
The Master and Primary Backup Link Active Scheduler (LAS)
shall reside in the host control system in redundant H1
network interface cards.
An additional backup LM Link Master (B/U LAS Link Active
Scheduler) shall be configured for all networks and shall
reside in the network device with the lowest field node
address. The Backup LAS should be placed in a separate
device that does not have controlling functions.
Primary and secondary interfaces should sit in separate
backplanes with separate CPUs, preferably in separate
control panels. Similarly, the primary and secondary power
supplies should not share the same backplane. Having
redundant interface cards, CPUs, and power supplies in the
same backplane is self-defeating since the backplane is a
single point of failure.
Each network shall be configured for automatic fail-over to
the Back-up LAS in the event of Master LAS failure.
Carl Ellis
Measure First
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
this site is owned by an nonsense
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
How to work temperature gauge?
There are many type of control cable like pair,core,tried, What are defination each one
What is defferent betwen ESP &PCP PUMP .HOW IT IS WORK?
Tell about your IFFCO plant visit.
What should be the main consideration while starting the Rotating compressor when we dont know the cut in and the cut off pressure setting of the pressure switch
What is standard procedure of manual mapping in Radar type level transmitter?
What pressure results for a flow transmitter of range 0- 180t/h in the dcs and 0-301mbar in the field using square root extraction. Kindly also suggest formulae for the percentages 0,25,50,75,100?
Questions on flow meters,few questions on HART protocol,
How many interlocks at turbine side?
what is basic difference between motion balance and force balance in pneumatic instrument?
what is the usage of QDV & VOLUME BOOSTER
How to interfacing microcontroller with a DC motor
what are the values of fuel flow rate in various places in boiler.
