Siemens SIPART PS2 6DR50xx Instrucciones de operaciones descargar pdf (Pagina 232)

Glossary

SIPART PS2 with and without HART communications

232 Operating Instructions, 09/2007, A5E00074631-07

Configuration

See parameterization.

Cornerstone

Management software for process instrumentation.

Dangerous failure

Failure with the potential to switch a safety-instrumented system to a hazardous or non-

functioning safety status.

Decrement

From the Latin word decrementare, decrease. Decrement is the defined amount of change

when decreasing a variable(s) gradually. In informatics, it is referred to as the stepwise

decrease in a numeric value.→Increment.

Degree of protection

The degree of protection of a device indicates the extent of protection. The extent of

protection includes the safety of persons against coming in contact with live or rotating parts,

and the protection of electric resources against the penetration of water, foreign bodies and

dust. The degrees of protection of electric machines are indicated by an abbreviation

comprising two letters and two numbers (e.g. IP55). The degree of protection is coded using

the IP code. The degrees of protection are standardized in DIN EN 60529.

Device category 1

Category 1 devices must be procured such that they ensure an extremely high degree of

safety. Devices in this category must ensure an extremely high degree of safety even for

faults that occur rarely. Even if two faults occur in the device, it should not lead to ignition.

Devices in this category are suitable for use in zone 0.

Device category 2

Category 2 devices must be procured such that they ensure a high degree of safety. Devices

in this category must ensure the required degree of safety in case of frequent faults or the

ones that are normally expected, e.g. defects in the device, and prevent the ignition sources.

Devices in this category are suitable for use in zone 1.

Device category 3

Category 3 devices must be procured such that they ensure a normal degree of safety.

Devices in this category must ensure the required degree of safety in case of frequent faults

or the ones that are normally expected, e.g. defects in the device, and prevent the ignition

sources. Devices in this category are suitable for use in zone 3.

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Siemens SIPART PS2 6DR50xx Instrucciones de operaciones Pagina 232