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• EN954-1 Safety of machinery. Safety related parts of control systems.
General principles for design.
• EN50199 Electromagnetic compability (EMC):Product standard for arc
welding equipment.
2.1.6 Safety categories
Equipment for personal safety has been designed so that safety functions are
maintained in the event of individual faults, such as a sticking relay, in the
supervision system. Faults are detected at the latest with the next call to the safety
function. This corresponds with category 4 in accordance with EN 954-1, Safety of
machinery. Safety related parts of control systems. Part 1: General principles for
design.
For other parts of the control system please refer to IRB 140/1400/2400.