Hardware Manual PCD1.M2110R1 │ Document 27-619 │ Version ENG 04 │ 2018-08-20
Saia-Burgess Controls AG
System Memory Structure
CPU / Control Process Unit
3-5
3
3.5
System Memory Structure
User program code incl. ROM DB/Text
256 Kbyte saved in the file system
Memory expansion with battery buffer
128 Kbyte SRAM for read/write access to DB and texts
PCD media with battery buffer
Register: 16'384
Flag:
16'384
Timer/counter: 1600
On-board user file system
8 Mbyte for web files, data logging, documents or backup
PLC file system
Special file system partition PLC_SYS for system data.
The user cannot access this partition. This is only for
internal use.
Backup for user memory
On file System => User BACKUP folder
3.5.1
Memory management of PCDs with COSinus operating system
The automation devices Saia PCD3 Plus, Saia PCD1.M2 and the programmable
panel are equipped with an on-board μSD flash card. When loading a user
application with Saia PG5
®
, all necessary files are stored in the internal flash on
the μSD card. If the operating voltage is applied to the automation device and
there is no executable program in the working memory, COSinus attempts to load
a valid program on start-up of the μSD card.
Memory structure and resources of the Saia PCD® systems
Working memory
User program
256 kByte
DB/Text
128 kByte
μSD-Flash memory
File system
8 MByte (maximum 900 files or 225 directories)
Flash memory extensions
Extension modules
1
Working
memory
μSD-Flash
Permanent
flash memory
extensions
Extension device
(max 1)
256 kByte
256 kByte
8 MB
Dateisystem
Memory structure of a PCD1.M2_ with additional memory cards
