CONTREX CX-1200 - Manual (Page 207)

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Status and Help screens:
Press the Help key to go to the help screen for a description of the PLC Programming. Press the Status key to
access the status screen. Press the Status key again to return to the PLC Programming screen. The Code is
still functional in the status screen. However, if you access the status screen from the PLC programming
screen, then you can not access the menu screens from the status screen. You must exit the PLC
Programming screen in order to access the menu screens.
Closing and Saving the PLC Programming screen:
To return to the menu screen, press the Menu key. If you made any changes, a dialog box will appear to
confirm the changes. To keep the changes, press the Enter key. Pressing the Enter key to accept the changes
does not alter the PLC backup or the PLC default program. To discard the current changes, press the Clear
key.
DANGER
When you exit the PLC Programming screen
and press the Enter key, the changes will take effect
immediately.
The new program could cause a digital output to
change state, and cause an actuator to engage or
disengage.
Creating a Customized Backup Program:
To save the changes that you have made to the PLC Program as a customized backup PLC program, go to the
Setup/Load & Save Parms screen (page 1) and enter “1” in Save PLC Prgm (CP-499).
Loading the Backup Program or the Default Program:
The last page (page 5) of the PLC programming help screens (accessed from any line) allows you to choose
between loading the backup PLC program (that you have customized) or loading the default PLC program that
was shipped from the factory. “Load Default Program” is the default. You can also access the PLC backup
or the PLC default programs from the Setup/Load & Save Parms screen (page 1). For the list of the factory
default PLC Program Logic, see Appendices: Appendix J.
NOTE: The backup PLC Program is identical to the default PLC Program until you customize the PLC and
then save the backup in the Setup/Load & Save Parms screen. In addition, if you perform a “Clear
9” power-up, your customized backup PLC Program will revert back to the default PLC Program.