WEG PLC300, User Manual, Page: 49 / 76

Description of the PLC300 Operation
PLC300 | 9-1
9 DESCRIPTION OF THE PLC300 OPERATION
WPS Software (Weg Programming Suite)
The PLC300 programming is done by means of the WPS software. With this tool, you can
develop and monitor the ladder program.
The screens and the alarms are also programmed by the WPS, by means of the screen
editor.
The configuration of the equipment, described previously, can be executed by the WPS,
particularly useful when the version without HMI is being used.
Startup
When connected, the PLC300 displays an opening screen for about 2 s which shows the
firmware version of the equipment:
[ P L C30 0 ]
[ W E G ]
[ - - - - - - - - - - - - - - - - - - ]
[ P T
V 4 . 0 0 ]
After the opening, the PLC goes to the HOME screen, or zero screen of the user. In case
there are no uploaded screens, a default screen is shown:
D e f a u l t H O M E .
User Program
When the PLC300 is energized, it is checked if there is a valid ladder program in the
memory; if any, the program is started immediately.
9.1 SCREEN MANAGEMENT
Up to 512 screens can be used by the user. These screens characterize the application,
by means of menus, data input and variable monitoring, etc. The screens interact with the
ladder program by means of markers (ladder variables), as well as with the user via keyboard.
The browsing between the screens is executed by the function keys, which must be properly
programmed to go to the wanted screen.
The <HOME> key always goes to the initial screen of the user (zero screen).
9.1.1 Levels of Access
Except for the zero screen (HOME), the other screens can be programmed with an access
password. Up to nine levels of access can be programmed to allow different kinds of
users with access to certain screens. The level of access zero means that the screen has
free access.
The higher the level of access, the greater the privilege. To access a level-five screen, it is