What is Difference Between Code Work And Data Work memory in 1500 CPU?

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Split from S7-1500 PLC Memory Concept.

Hi,
The following is extracted form the "SIMATIC S7-1500, ET 200SP, ET 200pro Structure and Use of the CPU Memory Function Manual":

Work memory
The work memory is volatile memory that contains the code and data blocks. The work memory is integrated into the CPU and cannot be extended. The work memory is only used in operation of the CPU.
In the CPUs, the work memory is divided into two areas:
● Code work memory: The code work memory contains runtime-relevant parts of the program code.
● Data work memory: The data work memory contains the runtime-relevant parts of the data blocks and technology objects. At the operating mode transitions POWER ON to startup and STOP to startup, tags from global data blocks, instance data blocks and technology objects are initialized with their start values; retentive tags retain their actual values as saved in the retentive memory.
Best regards,
Yu-wen