NORSTAT Safety Relays - Handbuch (Seite 8)

application guide safety relays from riese electronic page 8
Signaling current path A non redundant conducted output with forcibly guided contacts. These are used as
auxiliary contacts for signalling certain states of the machine.
SIL (Safety Integrity
Level) Safety Integrity Level
Synchronicity check
The synchronous actuation of the start buttons is monitored and for the two hand
control required. The outputs are only switched, if both start buttons are pressed
within 0,5s simultaneously.
Synchronizing-bright
connection For one way and reflex light barriers counts: If the beam of light is not interrupted
between transmitter and receiver or reflector, the exit is switched through.
Synchronizing-dark
connection For one way and reflex light barriers counts: If the beam of light is interrupted
between transmitter and receiver or reflector, the exit is switched through.
Type A- Standards Contain fundamental terms, design guidelines and general
aspects, which could be used for all machines. (basic safety
standard)
Type B- Standards Treat a safety aspects or a safety equipment, which can be
used for a wide range of machines.
Type B1-Standards
for special safety
aspects (e.g. safety clearance, surface temperature, noise) the
electric safety of machines (EN60204) the calculation of
safety clearance (EN 999).
Type B2-standards for safety equipment (e.g. two hand
controls, interlock devices, separating protective devices,
contactless protective equipments)
Types of standards
Type C- Standards (Standards for machinery safety) contain all safety
requirements for a special machine or a machine
construction. If this standard exists, it takes priority over the
B- or the A- standards. However a type C-standard can refer
to a type A- or a type B- standard. If no type C-standard
exists for a machine, the conformity can be established on
the basis of the type A- or B-standard. In any case the
requirements of the machine directive have to be achieved.
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