The online lexicon explains some of the key terms and abbreviations from the world of safety technology.
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A B C D E F G H I L M N O P R S T U W

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Actuator level
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Additional switch (channel 2) in interlocking devices with locking
• 
Additional transistor output SCHMERSAL
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AES
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Analysis level
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AOPD (Active optoelectronic protective device)
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Appliance safety law
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Auto start (automatic start, automatic reset)
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Bi-stable contact / latching contact
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Blanking
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Cable length(s) .../cable resistance, admissible
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Cam disk
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Capacitive proximity switch
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Cascading
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Categories
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Change-over contact with double break
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Change-over contact with single break
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Change-over switch / contact
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Circuitry/circuitry examples
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Coded actuating magnet
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Coded magnetic safety sensors
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Combined versions
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Concealed mounting
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Contact diagrams to IEC 60617
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Contact/Switch travel
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Contactor check
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Contactor with positive-drive contacts
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Control categories to EN 954-1
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Control category
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Control category and safety relay modules
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Control, 1- or 2-channeled
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Conventional relay technology
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Cross-short detection
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Cross-wire monitoring
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Current and voltage restriction
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Cyclic testing
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Cyclical monitoring
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Danger
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Dangerous area
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Declaration of Conformity
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Derating curve
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Detection capacity
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Differential travel / Hysteresis
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Differentiated restart
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Diverse programming of microprocessors
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Double leaf-spring system
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Double stroke
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Edge detection
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EEx protection class marking
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Effective aperture angle (EAA)
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Electro-sensitive position switches
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EMC Directive
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Emergency Stop EN 60204-1
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Emergency-stop control devices
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Enable delay time
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Enables
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Enabling output
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Enabling path
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Entry / Intervention time
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Error sources/troubleshooting
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ESPE (Electro-sensitive protective equipment)
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ESPE-E
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ESPE-S
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ESPE-T
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Exclusive-OR inputs
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Explosion-proof EEx
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Fail-safe standstill monitor
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Fail-safe timer
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Fault-secure semiconductor outputs
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Faults
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Feedback circuit
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Feedback contacts
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Fibre-optic sensors
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Floating blanking
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GS-ET...
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Guard device (EN 60204-1)
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Hazard
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Hazard analysis
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Hazard exposure
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Hybrid fusing
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Incremental shaft encoder
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Inductive proximity switch
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Input expander
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Input expander, modular
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Integral evaluation
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Interlock
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ISD (Integral System Diagnostics)
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Laser safety class 1
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Latching
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Latching contact
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Machine to EN 292-1
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Magnetic blow-out
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Manipulation in a simple manner
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MBL...
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Micro-processor-based circuitry
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Modes of operation of position switches
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Modular safety monitoring modules
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Motion and standstill monitoring, safety-related ...
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Multifunctional safety relay modules
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Multiple analyses
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Mushroom-head push button
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Muting
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Muting modules
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Namur proximity switch
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Non-floating inputs (= non-floating outputs of sensors)
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Non-separating protective device
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Normally closed contact / NC contact
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Normally open contact / NO contact
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Off delay
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One-/two-tact operation, safety relay modules for ...
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OSSD (Output signal switching device)
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Output expander
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Output expander, modular
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Overlapping contacts
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Photo-electric
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Photo-electric proximity switches
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Positive action to EN 60947-5-1
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Positive actuation
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Positive break (of a switch contact to EN 60204-1)
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Positive-drive (EN 60204-1)
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Positively driven contacts
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Power supply /Rise in voltage, slow ...
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Press overtravel modules
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Product range
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Programmable electronics with safety function
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Programme range
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Protect
• 
Protected field
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Protection against manipulation
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Protection class IP (Enclosure rating)
• 
Protective devices
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Prototype tests
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Pull-wire emergency stop switches
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Re-start interlock
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Reaction time (EN 61496)
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Redundancy
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Reflex light barriers
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Reflex sensor
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Relay safety combinations
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Remaining risk
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Reset
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Reset button
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Response time, reaction time
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Restart button
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Risk (EN 60204-1)
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Risk analysis
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Risk assessment
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Risk evaluation
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Risk judgement
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Safety
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Safety category
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Safety enables
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Safety of machines and machine controls
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Safety relay
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Safety relay modules
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Safety relay modules and control category
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Safety relay modules for special uses and tasks
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Safety relay modules for standard applications
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Safety solenoid-operated switches
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Safety switchgear
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Self-cleaning contacts
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Sensor level
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Sensorless standstill monitors
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Sensors, safety-related ...
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Separating guard device
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Series circuit (under consideration of the control category)
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Single stroke
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Slow action contact
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Snap action contact
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Soiling monitoring
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Solenoid interlock
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Solenoid locking principle
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Solenoid-operated switches
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Spring locking principle
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Staggered contacts
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Standardisation (circuitry technology/examples of use)
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Standstill and motion monitoring, safety orientated ...
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Standstill frequency
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Standstill monitor
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Start button
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Start function
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Start interlock
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Start-up test
• 
Start-up testing
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Statuatory requirements
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Stop categories to EN 60204-1 (9.2.2)
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Stop category 0 to EN 60204-1
• 
Stop category 1 to EN 60204-1
• 
Stop category to EN 60204-1
• 
Switching capacity
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Tactile safety equipment
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Test pulses on the sensor level
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Test push button
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Time monitoring
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Time window between channel 1 and channel 2
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Timer
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Total current
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Trailing edge
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Tropical version
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Two-hand relay modules
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Type A standards
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Type B standards
• 
Type B1 standards
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Type B2 standards
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Type C standards
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Uncoded magnetic safety sensor
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Unidirectional light barriers (safety light barriers)
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Universal current (UC)
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Waiting time
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Warning field
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Welding-current resistant proximity switch
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Wire-breakage monitoring