BECKHOFF CX2100­00x4 - Manual (Page 21)

Product overview
2.6 Button
2.6.1 Operating principle of the button
The CX1100­0xx4 power supply units all have four navigation switches and an Enter button. The buttons can
therefore be used to input five basic states
Button Value Button Value
UP 4 RIGHT 32
DOWN 8 ENTER / SELECT 64
LEFT 16
Combined inputs, such as UP + RIGHT or UP + RIGHT + ENTER can also be entered. Each value is made
available separately as a boolean value and can be linked in the PLC.
The values of the button can be assessed as a numerical value via a TwinCAT function. A combination of
the buttons can also be assessed via the value. The register can be accessed from within a PLC program,
and the value can be assessed. This requires a variable of type USINT first to be created in the PLC
program. This is then called as a parameter in the ‘F_CXNaviSwitchUSB’ function. The code fragment shows
the declaration of the required variables.
PROGRAM MAIN
VAR
bUp AT %I* : BOOL;
bDown AT %I* : BOOL;
bLeft AT %I* : BOOL;
bRight AT %I* : BOOL;
bEnter AT %I*: BOOL;
bToggle AT %I* : BOOL;
Taster : USINT; (* als Summenwert *)
eNaviSwitchCx2 : E_CX2100_NaviSwitch;
END_VAR
CX2100­00x4 21 Version 1.0