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Safety-Related Inputs
Overview
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.
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
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
Activation and Deactivation with Antivalent Behavior Between Two Input Channels of One Safety-Related
Input
Depending on the selected application function, the input channels of the safety-related input 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
by a normally open contact, whereas the signal for input channel S13 is provided by a normally
closed contact.
HR9Z-B2190 8/2020
(see page
26) and Electrical Installation
(see page
35) for details on the state machine of the device.
WARNING
(see page
(see page
59) , the signal for input channel S12 is provided
Engineering
51) for more details on the
39
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