Appendix
5.3.2
Categories according to EN 60204-1
5.3.2.1
Stop categories (chapter 9.2.2)
Stop category
Requirements
System reaction
Remark
0
Stopping by immediate disconnection of the
power supply for the drive elements of the
machine
uncontrolled stopping
Uncontrolled stopping means stopping a machine
movement by disconnecting the power supply for the drive
elements of the machine, operating all brakes and/or
other mechanical stopping devices.
1
Stopping, with the power supply for the drive
elements of the machine being maintained to
come to a standstill.
The power supply is only interrupted, when
the drive elements have come to a standstill.
controlled stopping
Controlled stopping means to stop a machine movement,
for example, by resetting the electrical command signal to
“0” as soon as the stop signal has been recognised by the
control. The electrical power supply for the drive elements
of the machine is maintained during stopping.
2
Stopping, with the power supply for the drive
elements for the machine being maintained.
controlled stopping
Tip!
Depending on the assessment of risks, electromechanical devices or semi-conductors may be
used for power disconnection.
This does not apply to emergencies!
5.3.2.2
Definitions
Term
Requirements
According to EN
60204-1
Stop
Stop functions of category 0, 1, 2 always have to be provided according to the risk assessment and the
functional requirements of the machine.
•
Stop functions of category 0, 1 must be operational in all operating modes.
•
A stop of category 0 must have priority.
•
Stop functions must have priority over assigned start functions.
Chapter 9.2.5.3
Emergency stop
In addition to the requirements to be met for the function “Stop”, the following requirements have to be fulfilled
for the function “Emergency stop”:
•
“Emergency stop” must be effective as “Stop” of category 0 or category 1. The category for “Emergency
stop” must be determined by means of a risk assessment for the machine.
•
Use only permanently wired, electromechanical equipment for the function “Emergency stop”, stop category
0. The function must not depend on an electronic logic (hardware or software).
•
For the function “Emergency stop”, stop category 1, the following applies to disconnecting power for the
drive elements of the machine:
– disconnection must be ensured.
– disconnection must be made by means of electromechanical equipment.
Chapter 9.2.5.4.2
After operation of the actuator for the emergency off unit, the function “Emergency stop” must make sure that
the danger is automatically averted or reduced in the best possible way.
1)
1)
“in the best possible way” includes:
•
Selection of the shortest deceleration rate
•
Selection of the right “stop” category according to the risk assessment
“automatic” means:
if defined accordingly, the emergency off function can be activated when the actuator of the emergency
off unit is operated
The emergency off function must be effective
after stop category 0 or stop category 1.
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