External device monitoring The external device monitoring (EDM) monitors the status of down‐
s
tream contactors.
In order to use external device monitoring, positively guided con‐
tactors must be used to switch off the machine. If the auxiliary
contacts of the positively guided contactors are connected to the
external device monitoring, the external device monitoring checks
whether the contactors switch correctly when the OSSDs are
switched off.
FPLC Fail-safe programmable logic controller
Hazardous area Hazardous area is any space within and/or around machinery in
whic
h a person can be exposed to a hazard. (ISO 12100)
Incremental encoder An incremental encoder generates electrical pulses proportional
t
o a movement. Various physical quantities can be derived from
these pulses, e.g. speed and distance covered.
OFF state The OFF state is the status of the outputs of the protective device,
where the controlled machine is triggered to quit its dangerous
state and the start-up of the machine is prevented (e.g., the volt‐
age at the OSSDs is LOW, so that the machine is switched off and
remains still).
ON state The ON state is the status of the outputs of the ESPE, where the
controlled machine is permitted to operate (e.g., the voltage at the
OSSDs is HIGH so that the machine can run).
OSSD Output signal switching device: signal output for the protective
device, which is used for stopping the dangerous movement.
An OSSD is a safety switching output. The functionality of each
OSSD is tested periodically. OSSDs are always connected in pairs
and must undergo dual-channel analysis for safety reasons. An
OSSD pair is formed from 2 OSSDs that are connected and ana‐
lyzed together.
PL Performance level (ISO 13849)
PROFINET PROFINET (Process Field Protocol) is an Ethernet-based network
used in indus
trial automation.
With PROFIsafe , PROFINET is also suitable for safety-oriented
data communication.
Protective field The protective field is the area in which the test object specified
b
y the manufacturer is detected by the electro-sensitive protec‐
tive equipment (ESPE). As soon as the electro-sensitive protective
device detects an object in the protective field, it switches the
associated safety outputs to the OFF state. This signal can be
passed to controllers resulting in the dangerous state coming to
an end, e.g. to stop the machine or the vehicle.
15 GLOSSARY
186
O P E R A T I N G I N S T R U C T I O N S | Flexi Soft Modular Safety Controller 8012478/1IG6/2023-02-24 | SICK
Subject to change without notice
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