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Workshop PG5 Resources 3.2.5 Texts & Data blocks TEXT/DB Main memory NV 0 3999 Extension memory NV 4000 (PCD4/6) 7999 (PCD2) 5999 (PCD1) 4999 Texts and DataBlocks (DB's ) are non volatile. Texts ( string of characters ) are used for: Messages on displays, texts you want to send to a pager, initial strings for modems and so on. DB's are used for data logging, tables and so on. Technical stuff: Where are Text/DB’s saved? Register, flags, timers, and counters are handled by the system and stored in a small RAM apart from the main memory. DB's and texts on the other hand are stored in the main memory, together with the user program. If you want to use a FLASH Eprom or a normal EPROM for your main memory, remember that if you are in run mode, you can read from this memory but not write to it. Therefore you can't alter the content of your DB’s ( for example your Data login ). In most cases you won’t bother with this, but if you know that you are going to read and write from your DB's, then make sure to use DB's which are stored in the extension memory => address 4000 and up. (This is the extension memory and it is always RAM, which means you can read and write to it). See how a Text or DB is declared in a Instruction list program: Example: Declaration of BD’s & Text TEXT 10 "Bonjour!" TEXT 11 [7]"Hello" DB 12 45,46,78,999,0 DB 13 [10] DB 14 [4] 2,3 ;Text number 10 contains the string Bonjour! ;Text number 11 is 7 characters long were from the last 5 are Hello and the first two are spaces. ;DB number 12 with the 5 integer values: ;45.46,78,999,0 ;DB number 13 is 10 values long and they are zero at start up. ;DB 14 is four values long. The first two are 2 & 3 the second ;two are 0 © Saia-Burgess Controls Ltd. Page 3-10
Workshop PG5 Resources Example: Data-logger in FUPLA See how you can easily log values from an analogue card into the DB 4010. Every time the signal "Store" comes up, the analogue value is read and then written into the DB with the number 4010. © Saia-Burgess Controls Ltd. Page 3-11
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Edition: 26/732E5 USERS GUIDE PCD P
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Workshop PG5 Welcome Introduction.
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Workshop PG5 Welcome System require
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