Teach mode programming – Banner D11 Series User Manual

Page 3

The Signal Strength indicator is Banner’s exclusive AID™ (Alignment Indicating Device

). This feature simplifies accurate alignment

during TEACH mode and provides a means of signaling when maintenance is needed during Run mode. When the pulse rate is slow,
clean the fiber sensing ends and check the alignment.

Maximum Sensitivity/Factory Defaults
The sensors are factory-programmed for maximum sensitivity. This default setting may be easily recalled by holding the push button for
two or more seconds to enter TEACH mode, and then clicking the push button four times in a row.

The default program also is set for light operate output and pulse stretcher OFF, push button enabled.

Perform the following procedures to program your own settings.

TEACH Mode
Sensitivity is automatically set (and optimized) by “teaching” the sensor the “light” and “dark” conditions. This is accomplished in TEACH
mode. TEACH mode requires that each of the two sensing conditions be presented to the fiber optics; when the push button is clicked,
the sensor samples the sensing condition and registers it into memory. After the second sensing condition is registered, the D11 Expert
automatically sets the sensitivity to the optimum value for the application, and then returns to Run mode.

NOTE: There is a period of a few seconds at the end of TEACH mode, before Run mode begins.

Light or Dark Operate Selection

The two sensing conditions may be presented in either order: the light condition first,
and then the dark condition, or vice versa. The condition presented first is the condi-
tion for which the output energizes. (In other words, the output will be light operated if
the light condition is TEACH condition #1, or the output will be dark operated if the
dark condition is TEACH condition #1.)
D11E sensors automatically set to a point just above the “dark” condition for the best
performance in low contrast sensing applications; D11E2 sensors automatically set to
a point midway between the “dark” and “light” conditions, to ignore subtle changes,
such as web flutter.

Max. Light Signal

Threshold for
D11E2 (e.g. = 1x)

Light Sensing

Condition

Threshold for
D11E (e.g. = 1x)

Min. Light Signal

Dark Sensing

Condition

Contrast Indication

When the push button is clicked to teach the second sensing condition, the
three LED indicators flash simultaneously to indicate relative sensing con-
trast. (Contrast is the difference in light level between the two sensing condi-
tions.)
Higher contrast allows higher sensitivity level, and resulting higher excess
gain. A high contrast level is directly related to sensing reliability, and is
more forgiving of subtle changes in sensing conditions. The contrast display
at the end of TEACH mode is shown.
NOTE: If the relative contrast level is unacceptable (1 flash), the program
will return to TEACH condition #1.

No. of flashes at end of

TEACH mode

Relative Contrast

Unacceptable

Low

Moderate

High

TEACH Mode Programming

Action

Indicator Status

Push and hold the button for more than 2 seconds.

Green LED: Flashes at 1 Hz
Amber LED: Off

U.S. Patent #4356393

D11 Expert Series

P/N 44279 Rev. C