User manual

IEC61131 User and Reference Manual
April 22, 2008
130
The Indicate I/O errors on STAT LED and output selection enables error indication.
The Disable I/O error indication selection disables error indication.
The OK button saves the parameters to the configuration file and closes the dialog.
The Cancel button discards changes and closes the dialog.
Lock Controller Command
The Lock Controller command locks the target controller to prevent unauthorized access.
The target controller rejects commands sent to it when it is locked. A controller that is
unlocked operates without restriction.
When selected this command opens the Lock Controller dialog. If the controller is already
locked, a message indicating this is shown instead of the dialog.
To lock the target controller enter a password in the Password edit box. Re-enter the
password in the Verify Password edit box. Any character string up to eight characters in
length may be entered. Typing in these edit boxes is masked. An asterisk is shown for each
character typed.
The Prevent radio buttons select the commands that are locked.
 Selecting programming commands prevents modifying or viewing the program in the
controller. Communication protocols can read and write Modbus registers.
 Selecting programming commands and database write prevents modifying or viewing
the program and prevents writing to Modbus registers,. Communication protocols can
read data from Modbus registers, but cannot modify any data.
 Selecting programming commands and database read/write prevents modifying or
viewing the program and prevents reading and writing the Modbus registers,.
Communication protocols cannot read or write Modbus registers.
The OK button verifies the passwords are the same and the lock controller command is sent
to the controller. The dialog is closed. If the passwords are not the same an error message is
displayed.
The Cancel button closes the dialog without any action.
Unlock Controller Command
The Unlock Controller command unlocks the target controller. The Unlock Controller dialog
prompts the user for a password to be used to unlock the controller. When selected this
command opens the Unlock Controller dialog. If the controller is not locked a message
indicating this is shown instead of the dialog.