Siemens SIRIUS 3RK3 Equipment Manual page 26

Product-specific information
2.1 General safety notes
NOTICE
Material damage caused by electrostatic charge
When handling and installing the MSS components, ensure that the components are protected
from being electrostatically charged. Changes to the system configuration and wiring are only
permissible while the supply voltage is switched off.
Connection of MSS 3RK3 central units is only permissible when the power supply is switched
off.
Note
Operational faults and malfunctions in communication
If the EMC Directive 2014/30/EU is not complied with when systems and devices are installed,
communication breaks may occur.
Note
Simultaneity of signals
Depending on when a signal change takes place within the cycle, the signal change is detected
either in the same cycle or not until the following cycle time.
This means it is possible for supposedly simultaneous signal changes to be detected at two
different inputs by the logic, but not simultaneously.
Take this behavior into account when creating your configuration.
Note
Do not cover all unused device and system interfaces.
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SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006