SBC PCD1 Series User Manual

Saia-Burgess Controls AG
Manual Manual PCD 1 / PCD 2 Series │ Document 26 / 737 EN22 │ 2013-11-26
CPUs and expansion housings
3-50
Backup of the user program
3
3.17.4 Backup/restore of RAM texts/DBs at run-time
Asdescribedabove,theapplicationcanbecopiedtotheashcardafter
downloading.Inordertostoreprocessdatagatheredduringoperation,thereisa
facilitytocopytextsorDBsfromextensionmemory(address>=4000)totheash
card,orconversely,tocopythelaststatewrittentotheashcardbackinthetext/DB
in extension memory. A maximum of 64 Kbytes are available for this.
Inordertousethisfunction,theoptionshownbelowmustbeactivatedinthehard-
warecongurationandthecongurationmustbeloadedintothecontroller.
 Thisleavesonly896Kbytesavailableforthewholeapplication(code,texts/DBsand
extension memory).
Forstoringtexts/DBsontheashcard,restoring,deletingandrunningdiagnostics,
therearefourSYSRD/SYSWRinstructionsprovided,asdescribedindetailbelow;
these can be invoked at a suitable place in the user program. These instructions must
beusedwithgreatcare,topreventanydamagetotheunitortheashcard.

SBC PCD1 Series Specifications

General

Brand	SBC
Model	PCD1 Series
Category	Controller
Language	English