4.3 Circuitry examples
4.3.1 Information on circuitry examples
The safety categories specified for the circuitry examples only apply to the entirety
of circuitry. This includes external circuitry, the properties of the external sensory
system/actuator system and a correct user program in terms of safety aspects. In-
sofar as he does not have recourse to the program examples to which the circuitry
examples make reference, the programmer must ensure that the user program he
creates satisfies all requisite measures to achieve the foreseen safety categorisa-
tion.
RESET
A RESET is the manual resetting into the ready to operate state after a safety de-
vice has been triggered. The RESET must be monitored or controlled by a device
categorised as safe.
In the event of EMERGENCY-OFF / EMERGENCY-STOP, the reset can be effect-
ed by the switch’s mechanical latching function in accordance with IEC 60947-5-5.
In this case the resetting is caused by the shut-down system itself.
START
A START command starts or restarts the operation of a machine or system moni-
tored by the protective device.
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