SBC PCD2.M5 Series - Page 46

Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Memory space on the PCD
PCD2.M5_ Classic CPUs and expansion housings
3-33
3
Thesecond,optionallycongurablepartisreferredtoinPG5as"extensionmemory
backup"(databackup)andcanbeusedtobackupDBsandtextstotheashduring
runtime.
If part of the backup memory is used as "extension memory backup", the available
"user backup memory" is reduced by twice the amount of "extension memory back-
up" used. In parallel with the reduction of the "user program memory backup", the
user program memory is also adjusted, so the total user program memory can be
copiedtothebackupash.
Available user backup memory
System RAM user program
memory
Flash user backup
(prg + data)
Default memory
conguration
5440
5540
1024 Kb 1024 Kb 48k prg lines,
64k txt, 256k ext.
Notethatinthedefaultmemoryconguration,eachprogramlinerequires4bytes.
Anyashmemorymodulesuitableforuserprogrambackup(e.g.aPCD7.R500)can
beusedasaashcard.Wheremultiplecompatiblemodulesareconnected,therst
modulefromtheleftwillbeused(SlotM1,M2).
Flash memory modules (optional)
ForthePCD,therearevariousashmemorymodulesfordifferentapplications.
Someofthesemodulesareexplicitlydesignedforaparticularuse(e.g.thePCD7.
R500foruserprogrambackup).However,thereareothermodulesavailablefor
varioustypesofstorage(e.g.thePCD7.R551M04,whichcontains1MBofmemory
spacefortheuserprogrambackupand3MBthelesystem).
Mostashmemorymodulesaresimplecards(PCD7.Rxxx),whichcanbeplugged
into a PCD2.M5xxx0 in Slot M1 or M2.
Flash memory modules for the le system
Apartfromtheashmemoriesmentionedaboveforbackinguptheuserprogram
memoryandDBs,thereisanothertypeofashmemoryavailableforles.These
memorymodulescanbeusedtosave"PC-readable"lessuchaswebpages,
imagesorlogles.Thecontentoftheseashmemorymodulescanbeaccessedvia
thewebserver,theFTPserver(forPCD2withEthernetinterfaceonly)andtheuser
program.