S7: Memory Configuration; Introduction; Active And Passive File System - Siemens SINUMERIK 840D sl Function Manual

S7: Memory configuration

15.1

Introduction

Memory areas
The CF card of the NCU contains two memory areas for storing and managing the data of the
local persistent and non-persistent data of the NC:
● Static NC memory
That static NC memory contains the persistent NC data of the active and passive file
system (Page 799).
● Dynamic NC memory
The dynamic NC memory contains the non-persistent NC data, such as macros, local user
data, buffer memory, etc., generated dynamically by the NC.
Deterministic behavior
To ensure the behavior of the NC is deterministic in all machining situations, all memory areas
of the local static and dynamic NC memory have a settable, but permanent size.
Memory configuration
The memory areas of the local static and dynamic NC memory are set up when the control is
first started based on the standard settings of the machine data that configure the memory.
These settings are adequate in most cases.
Reconfiguration
If necessary, the memory configuration can be adapted to the user-specific requirements. The
necessary reconfiguration of the memory can result in loss of all user data in the static NC
memory. Therefore, after a change to memory-configuring machine data, the Alarm 4400: "MD
change results in reorganization of the buffered memory (loss of data!)" is displayed. Prior to
activating the machine data change or reconfiguration of the memory by an NC reset, a
commissioning archive should be created.
The memory configuration will be changed the next time the NC is started. Then the created
commissioning archive can be read-in for restoring the user data.
15.2

Active and passive file system

The user-specific data of the NC are stored in the local static NC memory. The memory area
contains the data of the active and passive file system.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
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799