
//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/ 0750656794-CH029.3D – 300 – [298–309/12]
19.6.2004 9:21PM
Therecipelook-uptableconsistsof15battery-backeddataregistersD200toD214.
Battery-backedorlatchedregistersareusedtostoretherecipedata,sinceifthePLC
wereswitchedtostoporthepowersupplywasinterrupted,thenitisessentialthatthis
dataisnotlost.
29.4Enteringvaluesintoalook-uptable(DWR)
Thespeedvaluescannowbeentereddirectlyinto the recipe look-up table, which uses
dataregistersD200toD214andthendownloadeddirectlyintothe PLC,without
havingtodownloadtheladderdiagram.
WhenusingMEDOC, this process is known as DWR.
(a) D ¼Data registers
(b) W ¼Network