Siemens SIMATIC S7-1500 System Manual page 386

Glossary
System IP address
In addition to the device IP addresses of the CPUs, the redundant system S7‑1500R/H supports
system IP addresses. You use the system IP addresses for communication with other devices
(for example, HMI devices, CPUs, PG/PC). The devices always communicate over the system IP
address with the primary CPU of the redundant system. This ensures that the communication
partner can communicate with the new primary CPU (previously backup CPU) in the RUN-Solo
system state after failure of the original primary CPU in redundant operation.
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 will find further information in the glossary entry "Interrupt, time-delay".
Time-of-day interrupt
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".
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 will find further information in the glossary entry "Firmware of the CPU".
Warm restart
You will find further information in the glossary entry "Restart".
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD