Siemens SIMATIC S7-1500 System Manual page 517

Glossary
TIA Portal
Totally Integrated Automation Portal
The TIA Portal is the key to the full performance capability of Totally Integrated Automation.
The software optimizes operating, machine and process sequences.
Time-delay interrupt
You can find more information in the "Interrupt, time-delay" glossary entry.
Time-of-day interrupt
You can find more information in the "Interrupt, time-of-day" glossary entry.
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 can find more information in the "Interrupt, update" glossary entry.
User program
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 can find more information in the "Firmware of the CPU" glossary entry.
Warm restart
You can find more information in the "Restart" glossary entry.
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S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF