Hardware manual PCD1.M2220-C15 │ Document 27-640 – Version ENG03 │ 2020-03-25
Saia-Burgess Controls AG
System memory structure
CPU/processor unit
3-5
3
3.5
System memory structure
Application program code incl. ROM
DB/text
512 kByte saved in the file system
User memory with
FRAM technology
128 kByte FRAM for read/write access for DB and texts
PCD media with FRAM technology
Register: 16384
Flag:
16384
timer/counter: 1600
On-board user file system
128 MByte for web files, data logging, documents or backup
PLC file system
128 MByte file system partition PLC_SYS for system data
and user BACKUP directory.
The user cannot access this partition
(see chap. 3.8 Run/stop button)
3.5.1
Memory management of the PCDs with the COSinus OS
When the operating voltage is applied to the controller, a previously loaded
program is coped from the µSD flash memory to the CPU’s own SDRAM and
executed.
If there is no user program in the µSD flash memory, the program is loaded from
the M1 flash memory (if available).
When using a plug-in flash memory extension (M1 flash), the user program is not
copied to the µSD flash memory.
Memory expansion and resources of the Saia PCD systems
(see also Chapter 3.1 “Properties of the PCD1.M2220-C15 CPUs”)
Memory extension (number: 1)
512 kByte user program
SDRAM
memory
μSD flash
memory
Flash memory
extensions
PCD7.Rxxx
128 kByte RAM
FRAM
memory
128 MB file system (maximum of 2,500 files or 625 directories)
Memory structure of a PCD1.M2220-C15 with additional memory cards
