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You will find further information in the glossary entry "Interrupt, time-of-day".
Timer
Timers are components of the system memory of the CPU. The operating system
automatically updates the content of the "timer cells" asynchronously to the user program.
STEP 7 instructions define the precise function of the timer cell (for example on-delay) and
trigger its execution.
Update interrupt
You will find further information in the glossary entry "Interrupt, update"In SIMATIC, a distinction is made between user programs and the firmware of the CPU.
The user program contains all instructions, declarations and data that control a system or
process. The user program is assigned to the redundant system. Structuring into smaller unit
is supported.
Firmware: You will find further information in the glossary entry "Firmware of the CPU".
Value status
The value status describes a specific signal state. The value status is constantly updated
and cyclically transmitted by the field device as a quality statement together with the
measured value.
Warm restart
You will find further information in the glossary entry "Restart"Siemens provides products and solutions with industrial security functions that support the secure operation of plants,
systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and
continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens' products and solutions constitute one
element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems, machines and networks. Such
systems, machines and components should only be connected to an enterprise network or the if and to the extent
such a connection is necessary and only when appropriate security measures (e.g. firewalls and/or network segmentation)
are in place.

For additional information on industrial security measures that may be implemented, please visiSiemens' products and solutions undergo continuous development to make them more secure. Siemens strongly
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Use of product versions that are no longer supported, and failure to apply the latest updates may increase customers'
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systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and
continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens' products and solutions constitute one
element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems, machines and networks. Such
systems, machines and components should only be connected to an enterprise network or the if and to the extent
such a connection is necessary and only when appropriate security measures (e.g. firewalls and/or network segmentation)
are in place.
For additional information on industrial security measures that may be implemented, please visit
Siemens' products and solutions undergo continuous development to make them more secure. Siemens strongly
recommends that product updates are applied as soon as they are available and that the latest product versions are used.