Foreword
0 Introduction
1 Scope
2 Normative references
3 Definitions
3.1 Interlocking device (interlock)
3.2 Interlocking guard
3.3 Interlocking guard with guard locking
3.4 Guard locking device
3.5 Automatic monitoring
3.6 Positive mode actuation
3.7 Positive opening operation of a contact element
3.8 Stopping time (time for hazard elimination)
3.9 Access time (time for access to a danger zone)
4 Operating principles and typical forms of interlocking
devices associated with guards
4.1 Interlocking principles
4.2 Typical forms of interlocking devices
4.3 Technological forms of interlocking devices
5 Provisions for the design of interlocking devices
(independent of the nature of the energy source)
5.1 Actuation modes of mechanically actuated position
detectors
5.2 Arrangement and fastening of position detectors
5.3 Arrangement and fastening of cams
5.4 Reducing the probability of common cause failures
5.5 Guard locking device
5.6 Delay devices
5.7 Design to minimize defeat possibilities
5.8 Environmental considerations
6 Additional technological requirements for electrical
interlocking devices
6.1 Compliance with EN 60204-1
6.2 Interlocking devices incorporating mechanically actuated
position switches
6.3 Interlocking devices incorporating non-mechanically
actuated position switches (proximity switches and
magnetic switches)
7 Selection of an interlocking device
7.1 General
7.2 Conditions of use and intended use
7.3 Risk assessment
7.4 Stopping time and access time
7.5 Frequency of access
7.6 Performance considerations
Annexes
A (informative) Guard-operated interlocking device with
one single cam-operated position detector
B (informative) Guard-operated interlocking device with
tongue-operated switch
C (informative) Direct (mechanical) interlocking between
guard and start/stop manual control
D (informative) Captive-key interlocking device
E (informative) Trapped-key interlocking device
F (informative) Plug and socket interlocking device (plug/
socket combination)
G (informative) Guard-operated interlocking device
incorporating two cam-operated position detectors
H (informative) Mechanical interlocking between a guard
and a movable element
J (informative) Electrical interlocking device
incorporating magnetically actuated (magnetic) switches
K (informative) Electrical interlocking device
incorporating two proximity detectors
L (informative) Pneumatic/hydraulic interlocking devices
M (informative) Interlocking device with spring applied/
power released guard locking device
N (informative) Interlocking device with guard locking,
with manually operated delay device
P (informative) Bibliography