Sensaphone SCADA 3000 Users manual - Manual (Page 179)

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Chapter 15: Ladder Logic Programming
VIeWING AND FORCING LADDeR VARIABLeS, COUNTeRS, TImeRS & BITS
The real-time values for the Ladder Variables, Counters, Timers and Bits can be displayed
using the Ladder & C Variables form. From the main menu click Programming then Variables
or click on the Ladder & C variables button from the toolbar. Next select the Ladder Variables
Tab. The following form will appear:
Figure 8: Ladder Variables form
Ladder Variables
The Ladder Logic program can use up to 128 floating point variables. This form will display
the values of those variables. Use the Up/Down arrows to flip through the pages to access the
variables you wish to view. To change the value of a variable, double-click on the value you wish
to change. Enter the new value in the pop-up form and click OK.
Remote Variable Programming via Touch-Tone telephone
When you call into the SCADA 3000 and enter Voice Mode, a menu is spoken:
“To record message, press 1”, “To play message, press 2”, etc.
The menu option includes:
“To program ladder variable 127, press 9”
If you press ‘9’ the unit will say “Variable 127 is now at ___, enter number followed by the
pound key.”
You can enter a single digit between 0 and 9 using your touch-tone telephone. The numerical
value you enter will be copied into ladder variable 127. This allows you to remotely initiate a
control sequence within your ladder program simply by adding statements that check the value
of ladder variable 127. Once the desired logic has executed, you can reset ladder variable 127.
Ladder Timers
The Ladder Logic environment has 64 timers which can be used as necessary in your Ladder
program. The Ladder Timers form will display the parameter values for each timer, 16 at a
time. Use the Up/Down arrows to flip through the pages to access the Timer values you wish
to view. To change the value of a timer, double-click on the value you wish to change. Enter the
new value in the pop-up form and click OK.