Siemens SIMOTION C230-2 Equipment Manual page 140

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Standards and Approvals

Division into safety-critical and non-safety-critical areas

Nearly all systems contain parts that perform safety-related tasks (e.g. emergency

stop switch, protective grills, two-hand controls). So that the safety criteria do not

have to be applied to the entire control, it is usual to divide the control into two

areas – one that is critical to safety and one that is not critical to safety. No

special demands are made as regards safety in the area that is not safety critical

because an electronic fault would not have any effect on the safety of the system.

However, in the safety-critical area only controls and circuits that meet the relevant

specifications may be used.

Important note

Even if the project design of an electronic control ensures that it provides maxi-

mum possible safety by virtue of its design (e.g. as a result of a configuration with

multiple redundancy), the instructions contained in the operating manual must be

adhered to precisely, because it is possible that incorrect handling may put out of

action features intended to prevent hazardous faults and additional hazards may

also be created.

A-140

SIMOTION C230-2, 04.2003 Edition

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