1.5.9.2 Stop category 1 emergency stop (Safe
stop 1)
This example depicts the prerequisites and wiring for an emergency stop that fulfills the requirements
according to
IEC 60204-1:2016 stop category 1 (a controlled stop with power available to the machine actuators to
achieve the stop and then removal of power when the stop is achieved)
ISO 13849-1:2015 PLe, Cat. 3
IEC 61508:2010 SIL3
IEC 61800-5-2:2016 SS1 (Safe stop 1)
When the Emergency Stop Device (such as a push button or a light curtain) signals the execution of an
emergency stop, two redundant sets of contactors are triggered:
K1/K2 gives immediately the signal to the Master PLC/IPC Digital Input. When the Digital Input is logical
0, the Master PLC/IPC shall request “quick stop” via EtherCAT Controlword 0x6040.
K3/K4 are triggered after a configurable time delay. During the time delay, the machine can be
gracefully controlled to a stop before the activation of the SOMANET Node STO-SBC function.
1.5.9.2.1 Prerequisites
SOMANET Node Safety
Safety Relay
Emergency stop device
Power supply (PELV/SELV)
Reset/Start switch
Note
Note
It is necessary to use a
It is necessary to use a
momentary switch
momentary switch
for Reset/Start function to fulfill the requirement
for Reset/Start function to fulfill the requirement
regarding emergency stop “The reset of the emergency stop command
regarding emergency stop “The reset of the emergency stop command
shall not restart
shall not restart
the
the
machinery.”
machinery.”
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