Three classifications of the internal storage area of the Siemens S7-1200

Create Date: 2024-8-30 12:03:23|Source: Siemens/Siemens

The internal storage of the S7-1200 is divided into three types: working storage area, loading storage area, and maintenance storage area.
Three classifications of the internal storage area of the Siemens S7-1200

Loading storage area:

is a non-volatile store. Used to store user project files (user programs, data, and configuration).

IF A MEMORY CARD IS NOT USED, THE USER DOWNLOADS THE PROJECT USING THE TIA PORTAL SOFTWARE AND DOWNLOADS IT TO THE CPU'S BUILT-IN MOUNTING MEMORY.

If a memory card is used, the user downloads the project using the TIA PORTAL software and downloads it to the memory card, i.e. the memory card serves as the mounting storage area.

Note: With a high-capacity memory card, the mount storage area can be expanded

Symbol names and annotations in the project can also be downloaded to the mount store, which greatly facilitates the user's later debugging and maintenance.

Working Storage:

is a volatile store. The CPU copies some project content from the mount store to the working storage when executing the user program. After a power failure, the contents of the working storage are lost after a power outage and cannot be expanded.

Note: With a large memory card, the working storage area cannot be expanded

Retention Storage:

It is used to store the process data of the specified unit when the CPU is powered off to ensure that the data is not lost when the power is off

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