FOXBORO FBMSVH DCS control system module

FOXBORO FBMSVH DCS control system module

Technical data of product parameters

For a quantitative analysis, start by determining the diagnostic coverage. Diagnostic coverage indicates the share FBMSVH DCS
of total failures detectable by a test procedure. It is obvious that partial stroke testing can detect the valve being
stuck in an end position, yet a fault in the valve’s seat cannot be detected. Tests show that a lack of torque reserve FBMSVH DCS
is the main cause of failure, e.g. of ball valves, in safety-instrumented systems. As a result, high diagnostic coverage can be assumed. Diagnostic coverage depends on the failures occurring in the specific process and the diagnostics possible. Therefore, it is proposed in VDI 2180, Part 5, Table 2, to determine diagnostic coverage by
performing an FMEA (Failure Mode and Effects Analysis), which is based on the diagnostics possible in the specific plant (Table 1). In doing so, a diagnostic coverage value can be determined. Mere manufacturer specificationsFBMSVH DCS
unrelated to a specific process, sometimes giving up to three significant figures, are not considered trustworthyFailures undetected during the partial stroke test need to be taken into account when calculating the PFDavg value,
while the effects of detectable failures can be omitted. To do so, the PST interval should be considerably longer
than that of the proof test, e.g. ten to twenty times longer. Fig. 23 shows a comparison of the achieved PFDavg
values for a specific safety-instrumented system. The figures are selected such that the safety-instrumented system
in the example needs to be proof-tested after one year to achieve SIL 2. Diagnostic coverage is assumed to be 0.6
(60 %), a typical value more on the conservative side. With this value, the (proof) test interval can be extended to
two years by performing monthly partial stroke tests. This result is plausible as eliminating more than half of the
dangerous undetected failures results in roughly doubling the test interval.

Product picture display

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Introduction to main products

Focus on DCS, PLC, robot control system and large servo system.

Main products: various modules/cards, controllers, touch screens, servo drives.

Advantages: supply imported original products, professional discontinued parts, fast delivery, accurate delivery time,

Main brands include ABB Bailey, GE/FANC, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, Emerson EMERSON, OVATION, MOTOROLA, XYVOM, Honeywell HONEYWELL, Rexroth, KUKA, NI, DEIF, Yokogawa, Woodward WOODWARD, Ryan, Schneider SCHNEIDER, Yaskawa, Moog MOOG, PROSOFT and other brands

reminder

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