Full-Screen Monitoring

After you have successfully log-in to the TLServer (for explanation of log-in procedure, please refer to "Log-In to TLServer") , a "Full-Screen Monitoring" window will be opened for you to monitor and control your PLC. The ID address of the PLC selected for on-line monitoring will be shown on the window's title, as shown below:

The Full Screen Monitoring screen comprises 5 columns: Input,  Timer, Counter/Sequencer,  Relay, and Output. With the exception of the Relay table which contains up to 512 elements, all other columns contain 256 elements each and each one has a vertical scroll bar. You can use the mouse to scroll each column independently to locate the desired I/O.

The label names for the inputs, outputs, relays, timers and counters defined earlier in the I/O tables automatically appear in their respective columns. To the left of each label name column is an "LED" lamp column which indicates the ON/OFF state of respective i/os. A red color lamp represents the ON state of an i/o, whereas a dark grey color lamp represents an OFF state. The I/O number is indicated in the middle of the lamp.

The monitoring screen requires the use of the mouse to work properly so it is important to remember the mouse button actions as follow:

Left Mouse Button	Turn ON the PLC's I/O when pressed. Turn OFF the PLC's I/O when button is released.
Right Mouse Button	Toggle the PLC's I/O when pressed once. (i.e. OFF becomes ON and ON becomes OFF)

There is a check box near the upper right hand corner of the on-line simulator. This check box must be checked before you can force set/reset the PLC's I/O. When you run the "Full Screen Monitoring" the first time, this box is unchecked to avoid acccidentally changing the state of a PLC's I/O.

Note: The "Control" checkbox is disabled if your Access Level has been defined only as "Visitor" in TLServer since a "Visitor" has no right to affect the PLC's operation.

Important Notes If you right click on the "Input" field, the selected PLC input will be changed only for 1 scan time. After that the PLC's I/O update process will automatically change the input bit back to its actual physical input state. It is not possible to permanently force the PLC's input to a different logic state even if the PLC is paused. As such, you will not be able to see the changes being reflected on the screen when you click on an "Input". When you force an I/O to change state during on-line monitoring, there may be a slight delay before you are able to notice the changes being reflected on the screen. This is due to the unavoidable time delay which occurs when communicating with the PLC via the Internet. However this may serve as a feedback that your action has been accepted and carried out by the PLC.

View, Select, Pause, Reset Buttons

	View TBASIC Variables. See document on Viewing System Variables
	Halt the PLC. The "Pause" lamp of the PLC should be lighted up after you click the pause button. This button is disabled when the "Control" check box is not selected.
	Reset All I/Os and data in the PLC. (same as <Ctrl-R>). This button is disabled when the "Control" check box is not selected.
	Allows you to select a PLC for monitoring by specifying the ID address. Up to a maximum of 256 PLCs may be connected to one TLServer and i-TRiLOGI allows you to select any one of the PLCs for on-line monitoring and/or programming. When clicked, the password dialog box will be opened with only the ID field available for you to enter the new ID value.

Monitoring PLC's I/O Status on Ladder Diagram

• During on-line monitoring, the logic states of any i/o of the PLC is also displayed on the ladder diagram. An input, output, relay, timer or counter  that is turned ON will have its label name highlighted in the ladder diagram. This feature helps greatly in debugging and understanding the logical relationship between each i/o. For example, from the following figure, we can see clearly how the "Self-latching" circuit for relay "Run" works. When we first turn ON the "Start" input, "Run" will be energized and its contact, which is parallel to "Start", will hold itself in the ON state, even if we subsequently turn OFF the "Start" input.

• Note that whether the highlight is turned is based strictly on the logic state of an element.  You will have to interpret whether the contact is opened or closed by examining if it is a normally-open (N.O.) or a normally-closed (N.C.) contact.  A highlighted N.C. contact means that the contact is opened, whereas a highlighted N.O. contact means that the contact is closed.