Safety Integrated - Industry - Siemens

SIMOCODE pro direct starters with safety technology
Emergency stop monitoring with monitored start
Category 4 according to EN 954-1
Function
Description of the Functionality
Persons near machines (e.g. in production engineering) must
be suitably protected by technical equipment. The
EMERGENCY STOP control unit is a widely used component for
protecting persons, machines and the environment against
danger.
SIMOCODE pro is a flexible, modular motor management system
for low-voltage motors with constant speeds. It optimizes
the connection between I&C and the motor feeder, increases
plant availability while helping to cut planning and commissioning
costs during plant operation and maintenance. Integrated
in the low-voltage switchgear, SIMOCODE pro is the intelligent
connection between the higher-level automation
system and the motor feeder.
In this Safety Functional Example, the EMERGENCY STOP control
unit with positive opening contacts is monitored by a
SIRIUS 3TK2823 safety switching device as per category 4 according
to EN 954-1. If the EMERGENCY STOP is activated, the
3TK2823 safety switching device switches off its corresponding
drive as per Stop Category 0 according to EN 60204-1.
Activation of the EMERGENCY STOP is signaled to the
SIMOCODE pro via the IN4 input. This signal is used to activate
the switching state in SIMOCODE when the EMERGENCY STOP
is activated. If this contact reports "zero", SIMOCODE issues
the OFF command. After the EMERGENCY STOP has been released
and the safety switching device has been acknowledged,
the signal at the IN4 input is active and the drive can
be restarted.
A yellow LED on the operator panel will light up if the
3TK2823 trips. The operator can start the drive again as soon
as the LED turns off.
The same signal is sent to the higher-level PLC via the Cyclic
Send 1 function, and can be used here to release the switchon
function in the remote operating mode.
This example takes the safety function into particular consideration.
Operational switching of the motor feeder is via a
standard PLC and is not taken into further consideration here.
Note
Equipment, functional aspects and design guidelines
for EMERGENCY STOP control units can be found in
EN 418 (ISO 73850).
Flow Diagram
The following flow diagram illustrates functional interrelationships
(for reasons of clarity, operational stopping has not been
included)
Start
Operating voltage
switched on?
yes
Has the
EMERGENCY STOP
pushbutton been released?
yes
acknowledged?
yes
EMERGENCY STOP
is acknowledged,
K1 is activated
EMERGENCY STOP
signal to
SIMOCODE pro
changes to 1,
SIMOCODE pro
is ready for switch-on
Start command?
yes
SIMOCODE pro
starts the motor,
K2 is activated
Drive is running
no
no
no
no
Is the motor running?
Has the
EMERGENCY STOP
pushbutton been pressed?
Functional Example No. CD-FE-I-037-V10-EN 127
no
yes
3TK2823 switches off
K 1 and K 2
Drive stops and is
disconnected from
the network
EMERGENCY STOP
signal to SIMOCODE
pro changes activates
the switch-off command
SIMOCODE pro signals
EMERGENCY STOP
on the operator panel
and sends the message
via cycl. signal data
yes
no
Stop category 0
Ex. No.
5.1