Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual de usuario descargar pdf (Pagina 108)

Publication 1794-UM064B-EN-P - May 2014

96 Apply FLEX I/O Modules

Define the Area

Classification

Before you can determine what components will make up your FLEX I/O

system, you must define the area in which that system will operate. You must

determine the following:

• Classification method

•Hazard

• Temperature rating

Decide Classification Method

Your application location will usually decide whether the classification method is

Zone or Class/Division, but the system designer may make this determination.

FLEX I/O IS CERTIFIED FOR ZONE METHOD ONLY. Certification is

pending for Division method.

Determine Hazard

Hazard, typically gas, dust, or fibers, is determined by the material being

processed. For example, a coal mine will generally be rated for dust and methane

gas hazards. FLEX I/O IS CERTIFIED FOR GAS HAZARD ONLY.

Certification is pending for attaching wiring to FLEX I/O modules from a dust

and fiber hazardous area.

Determine Temperature Rating

The spontaneous ignition temperature of the hazard in your application

determines the temperature rating. For example, an application with a hydrogen

hazard may use equipment with a temperature rating of T1 because hydrogen’s

ignition temperature is 550 °C. FLEX I/O IS CERTIFIED AS A T4 SYSTEM.

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Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual de usuario Pagina 108