Parallel Outputs; Screen Saver - Omron NT4S Operation Manual

Standard Mode
4.15

Parallel Outputs

4.16

Screen Saver

The parallel outputs of the operating terminal can be addressed directly with the
function keys and by the controller. To be able to operate the parallel outputs from
the controller, a variable must be defined for the control word. The word must be
divided into two single bytes if the controller is only capable of accessing in byte
mode. The byte order depends on the type of controller.
15 14 13 12 11
A1 A1 A2 A2 A3
ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes ON/OFF Flashes
Fig. 17: Structure of the Control Word
The structure of the control word illustrates that one bit pair always controls one
output. The following truth table applies to every bit pair:
0 0 0 0 0 0 0 0 0 0
Output OFF
1 1 1 1 1 0 0 0 0 0
Output ON
1 1 1 1 1 1 1 1 1 1
Output FLASHES
Fig. 18: Truth table for Parallel Outputs
In addition to the variable name, the polling time must be specified in the program-
ming software to determine the cyclic intervals at which the control word is to be
polled.
Outputs can also be addressed by means of function keys, provided this has been
defined in the programming software. An output is being addressed (ON) as long
as the function key is pressed.
The programming software checks if the function keys and the controller want to
access the same outputs.
Some terminals are fitted with a screen saver. This function monitors all outputs to
the display. If the system detects that nothing is being output to the display, a
timeout begins to elapse. After the timeout has elapsed, the display is blanked and
the status LED in the Help key begins to flash. The display can be reactivated by
pressing any key.
Activation of the screen saver can be made dependent on the display of cyclic
variables.
The timeout can be defined in 0.1 second steps.
If the timeout is set to 0, the screen saver remains deactivated.
10 9 8 7 6
A3 A4 A4 A5 A5
Section 4-16
5 4 3 2 1
A6 A6 A7 A7 A8
0
A8
163