Siemens S7-1500 Function Manual page 80

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 enable a plant or
process to be controlled. The user program is assigned to a programmable module (e.g.
CPU, FM) and can be structured in smaller units.
Firmware: see glossary entry "Firmware of the CPU"
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Glossary
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