Lenze Global Drive PLC Developer Studio Manuel d'utilisateur télécharger pdf (Page 84)

8.3 Memories

Drive PLC

Appendix

8−4

DrivePLC DE 6.0

8.3 Memories

The below table gives you an overview of the memories available:

Memory Size Info

ROM

Program memory 256 kbytes Re−written whenever the program is downloaded.

RAM

PLC data memory

10 kbyte

Can be symbolically used for FB instances and PLC variables.

24 kbytes

(as of version 7.x)

Application data memory 2 blocks

à 64 kbytes

Data get lost after mains disconnection.

E2PROM−buffered memory

Retain memory 200 bytes See subsection 8.3.1

Tip!

Function library LenzeMemDrv.lib includes functions for read/write access to the additional backup

memory (application data memory) of the PLC.

 Additional information can be found in the Manual for function library LenzeMemDrv.lib.

8.3.1 Retain memory

In the retain memory the values of the retain variables are stored safe from power failure and are thus

available to the program even after mains switching. (Saving with C0003 = 1 is not required.)

 Retain variables are declared by means of the variable class VAR RETAIN.

 Retain variables are created as a symbolically addressable memory.

 With each program download the retain variables are reset to their initialisation value. If an

initialisation value has not been defined, the corresponding retain variable will be initialised

with the value "0".

 In the DDS online mode you can use the commands Online W Reset (cold) and Online W

Reset (original) to reset the retain variables in the PLC to their initialisation values.

8.3.2 Downloading data

In DDS (as of version 2.0) it is possible to attach a file to your project whose data is automatically

downloaded to the PLC when the program is downloaded.

 This mechanism is, for instance, used in the Software Package − Cam to download motion

profiles.

Note!

 With the 9300 Servo PLC the additional data is loaded into the application FLASH.

 With the Drive PLC the additional data is directly attached to the PLC program because the

Drive PLC does not have an application FLASH.

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Lenze Global Drive PLC Developer Studio Manuel d'utilisateur Page 84

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