Engineering
40
HR9Z-B2192 8/2020
Safety-Related Inputs
Overview
The following sections provide basic information on the safety-related inputs such as principle of
activation and deactivation as well as antivalent behavior. Refer to the chapters Electrical
Characteristics
(see page 26)
and Electrical Installation
(see page 53)
for more details on the
safety-related inputs.
General Information on Activation and Deactivation of Safety-Related Inputs
In the present document, “activation” of a safety-related input means that a safety-related input
changes its state so that the device can enter the operating state Run: Outputs Energized.
The term “deactivation” of a safety-related input means that a safety-related input changes its state
so that the device enters the operating state Run: Outputs Deenergized.
See Operating States
(see page 35)
for details on the state machine of the device.
Activation and Deactivation with Antivalent Behavior Between Two Safety-Related Inputs with One Input
Channel Each
Depending on the selected application function, the safety-related inputs are configured for
antivalent behavior. Antivalent is defined here as a normally open and a normally closed contacts
working in synchronization.
For example, for application function 3
(see page 61)
, the signal for input channel S12 is provided
by a normally open contact, whereas the signal for input channel S22 is provided by a normally
closed contact.
WARNING
INSUFFICIENT AND/OR INEFFECTIVE SAFETY-RELATED FUNCTIONS
Only connect a sensor/device to a safety-related input that meets all requirements as per your
risk assessment and that complies with all regulations, standards, and process definitions
applicable to your machine/process.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
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