Vega SOLITRAC 31 4 … 20 mA_HART - four-wire With SIL qu Bedienungsanleitung PDF herunterladen (Seite 27)

6 Functional safety (SIL)

SOLITRAC 31 • 4 … 20 mA/HART - four-wire

43387-EN-131119

•

4 … 20 mA current output

6.4 Safety concept of the parameterization

The following tools are permitted for parameterization of the safety

function:

•

The integrated display and adjustment unit for on-site adjustment

•

The DTM suitable for the signal conditioning instrument in con-

junction with an adjustment software according to the FDT/DTM

standard, e. g. PACTware

Note:

For operation of the SOLITRAC 31 the DTM Collection version 1.67.2

orhigherisrequired.Themodicationofsafety-relevantparametersis

only possible with active connection to the instrument (online mode).

To avoid possible errors during parameterization in a non-safe user

environment,avericationprocedureisusedthatmakesitpossible

to detect parameterization errors reliably. For this, safety-relevant

parametersmustbeveriedbeforetheyarestoredinthedevice.In

normal operating condition, the instrument is also locked against

parameter changes through unauthorized access. This concept ap-

plies to the adjustment on the instrument but also to adjustment with

PACTware with DTM.

For protection against unwanted or unauthorzed adjustment, the set

parameters must be barred from unauthorized access. For this rea-

son, the instrument is shipped in locked condition. The PIN in delivery

status is "0000".

Whenshippedwithaspecicparameteradjustment,theinstruments

are accompanied by a list with the values deviating from the basic set-

ting. By entering the serial number, the list is available as a download

under "www.vega.com/VEGA-Tools".

Afterachange,allsafety-relevantparametersmustbeveriedand

conrmedviaacharacterstringcomparison.

The parameter settings of the measurement loop must be docu-

mented. For this purpose, the document "SIL device settings" is at-

tached to each instrument listing all safety-relevant parameters in the

shipping status as well as containing free space for own notes. This

document is also available on our homepage. In addition, a list of the

safety-relevant parameters can be stored and printed via PACTware/

DTM.

For each parameter change, the instrument must be unlocked via a

PIN (see chapter "Setup steps - Lock adjustment"). The device status

is indicated by the symbol of an unlocked or locked padlock.

Warning:

If adjustment is enabled, the safety function must be considered

as unreliable. This applies until the parameterization is terminated

correctly. If necessary, other measures must be taken to maintain the

safety function.

Tool for operation and

parameterization

Reliable parameterization

Safety-relevant param-

eters

Release adjustment

Unsafe device

status

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