BECKHOFF CX2100­00x4 - Manual (Page 23)

Product overview
2.7 Example Program
The following PLC program shows by way of an example how the three function blocks are used for the
power supply unit.
PROGRAM MAIN
VAR
nCounter AT %Q*: USINT;
(* navi switch *)
bUp AT %I* : BOOL;
bDown AT %I* : BOOL;
bLeft AT %I* : BOOL;
bRight AT %I* : BOOL;
bEnter AT %I* : BOOL;
bToggle AT %I* : BOOL;
nIn : USINT;
eNaviSwitchCx2 : E_CX2100_NaviSwitch;
(* get display *)
fbGetDisplayText : FB_CXGetTextDisplayUSB;
bExecuteRead : BOOL;
eModeRead : E_CX2100_DisplayModesRd;
nCursorMode : USINT;
nBacklight : USINT;
bReadCursorInfoReq : BOOL := TRUE;
bReadBacklightReq : BOOL := TRUE;
bReadLine1Req : BOOL;
bReadLine2Req : BOOL;
bReadLinesReq : BOOL := TRUE;
(* set display *)
fbSetDisplayText : FB_CXSetTextDisplayUSB;
bExecuteWrite : BOOL;
eModeWrite : E_CX2100_DisplayModesWr;
bCursorOnReq : BOOL;
bCursorOffReq : BOOL;
bBlinkCursorOnReq : BOOL;
bBlinkCursorOffReq : BOOL;
bBacklightOnReq : BOOL;
bBacklightOffReq : BOOL;
bClearDisplayReq : BOOL;
bWriteLine1Req : BOOL;
bWriteLine2Req : BOOL;
bWriteLinesReq : BOOL;
bSetCursorPosXReq : BOOL;
bSetCursorPosYReq : BOOL;
bSetCursorPosXYReq : BOOL;
(* common *)
nCursorPosX : USINT;
nCursorPosY : USINT;
sLine1 : STRING;
sLine2 : STRING;
bBusy : BOOL;
bError : BOOL;
nErrorID : UDINT;
END_VAR
nCounter := nCounter + 1;
nIn.2 := bUp;
nIn.3 := bDown;
nIn.4 := bLeft;
nIn.5 := bRight;
nIn.6 := bEnter;
(* get navi switch *)
eNaviSwitchCx2 := F_CXNaviSwitchUSB(nIn);
(* prepare get display mode *)
IF (eModeRead = eCX2100_DisplayNoActionRd) AND (eModeWrite = eCX2100_DisplayNoActionWr) THEN
IF bReadCursorInfoReq THEN
eModeRead := eCX2100_ReadCursorInfo;
bExecuteRead := TRUE;
ELSIF bReadBacklightReq THEN
eModeRead := eCX2100_ReadBackLight;
bExecuteRead := TRUE;
CX2100­00x4 23 Version 1.0