Safety Integrated - Industry - Siemens

2 safety circuits in a cascade according to Category 4 in
compliance with EN 954-1
(PM-D F X1 and Failsafe Motor Starter )
with ET200S Safety Motor Starter Solution Local
Function
Description of the functionality
If people (in production technology) are close to machines,
then they must be protected using the appropriate equipment.
The EMERGENCY STOP command device represents a
widely established component that protects man, machine
and environment against potential hazards.
This safety function example will show how a cascaded
EMERGENCY STOP shutdown with 2 motor starter groups can
be implemented in an ET200S station.
A PM-D F X1 safety module can provide a total of 6 safetyrelated
shutdown groups (refer to the ET200S Motor Starter
Manual) by accessing the SG1 to SG6 buses (safety groups) of
the Failsafe Motor Starter. It routes the safety-related control
voltage of the safety shutdown groups SG1 to SG6 to the SG
rail of the terminal module of the next Failsafe Motor Starter.
The terminal modules of the Failsafe Motor Starter additionally
have a coding block. This allows the motor starter to be
assigned one of the six safety-related shutdown groups (refer
to page 67). The shutdown is realized by a safety relay switching
one of the 6 SG buses into a no-voltage condition.
The first two motor starters (refer to page 66) are, in this function
example, connected to SG1 - the others to SG2. The motor
starters can be shutdown in a safety-related fashion by
shutting down an SG.
The EMERGENCY STOP command devices with positivelyopening
contacts are monitored by the 3TK2841 safety relays.
If the EMERGENCY STOP of group 1 is actuated, then the
3TK2841 (K1) shuts down its enable circuit according to stop
Category 0 according to EN 60204-1. The SG1 and the
3TK2841 (K2) are shutdown. The 3TK2841 (K2) in turn shuts
down the SG2.
If the EMERGENCY STOP of group 1.1 is actuated, the 3TK2841
(K2) shuts down its enable circuit according to stop Category
0 in compliance with EN 60204-1. SG2 is shutdown.
Drives are stopped in this particular function example. Before
restarting or acknowledging the EMERGENCY STOP shutdown
using the start button, it is checked as to whether the contacts
of the EMERGENCY STOP commanding device are closed.
This functional example only discusses the safety function.
The motor starter is operationally switched using a standard
PLC and is not considered any further here.
Note
Equipment, functional aspects and design guidelines
for EMERGENCY STOP command devices are provided
in EN 418.(EN ISO 13850 in draft status).
Functional Example No. CD-FE-I-029-V10-EN 63
Ex. No.
3.5