P/N 122928 rev. C 5
Banner Engineering Corp.•Minneapolis,MNU.S.A
www.bannerengineering.com•Tel:763.544.3164
R58 Expert
™
Registration Mark Sensors
Dynamic TEACH
Dynamic TEACH is used to configure sensitivity during actual sensing conditions, when
looking for a mark against its background condition. The R58E takes multiple samples of the
registration mark against its background material and automatically positions the threshold at the
optimum level. See Figure 2. The registration mark must be presented at least two times during
Dynamic TEACH.
WhenDynamicTEACHisused,theOutputONstatewillbetheshorterduration(smaller)
event sensed, and LO/DO will be set accordingly. To change the output state, change to either
LO or DO in SETUP mode, or pulse the remote line three times (see page 8).
Maximum Feed Rate
In order to optimize performance and ensure that all LED color and gain combinations
are evaluated during Dynamic TEACH, the registration mark must encompass the 1.2 mm
dimension of the 1.2 mm x 3.8 mm sensing image for at least 0.002 seconds. Therefore, the
maximumfeedratecanbedeterminedwiththefollowingformula:
Maximum Feed Rate in mm/sec. = (registration mark width in mm – 1.2) / 0.002
Example with a 5 mm registration mark:
Maximum Feed Rate = (5 mm – 1.2) / 0.002 = 1900 mm/sec.
NOTE:Registrationmarksnarrowerthanthe1.2mmsensingimagewidthcanbedetectedat
feed rates less than 600 mm/sec, but the contrast will be reduced, due to averaging of
the background and the registration mark.
Dynamic TEACH and Manual Adjust
Sensitivity may be adjusted at any time when the sensor is in RUN mode by clicking the “+”
and “-” buttons. Each click translates to 1/2 segment on the bargraph display. For best sensing
reliability, the light and dark conditions should register equally distant from the switchpoint on
the bargraph display.
Procedure Result
Push Button Remote Line
Access
TEACH Mode
•Pressandholdthe
Dynamic push button
for > 2 seconds.
•Holdtheremotelinelow
for > 2 seconds.
LO and DO: Alternately flash Green
Output: OFF
Bargraph display: Goes OFF
Teach Sensing
Conditions
•ContinuetoholdDynamic
push button.
•Presentsensingconditions
(present registration mark
at least twice).
•Continuetoholdtheremote
line low.
•Presentsensingconditions
(present registration mark
at least twice).
LO and DO: Alternately flash Green
Output: OFF
Bargraph display: Remains OFF
Return to RUN Mode
•ReleasetheDynamic
push button.
•Releaseremoteline/switch. Teach Accepted
•Bargraphdisplayashesonesegmentforthreesecondstoindicate
relative contrast (see contrast table above).
•SensorentersRUNmode.
Teach Unacceptable
•Pairsofbargraphdisplaysegmentsashinunisonforthreesecondsto
warn of unacceptably low contrast.
•SensorreturnstoRUNmodewithoutchangingsettings.
T T T T
T
T
0.8 seconds
> 2 seconds
T T
TTT
T T
T T
T T
T
TT T
TT T T
T T
T T
T
T
T T
T T
TT T
TT
T
T T T
T T
TTT T
TT
T
TT T T
T T
T T T T
T
T
0.8 seconds
> 2 seconds
T T
TTT
T T
T T
T T
T
TT T
TT T T
T T
T T
T
T
T T
T T
TT T
TT
T
T T T
T T
TTT T
TT
T
TT T T
T T
T T T T
T
T
0.8 seconds
> 2 seconds
T T
TTT
T T
T T
T T
T
TT T
TT T T
T T
T T
T
T
T T
T T
TT T
TT
T
T T T
T T
TTT T
TT
T
TT T T
T T
Bargraph
Display
Segment*
Relative Contrast /
Recommendation
6 to 8 Excellent: Very stable operation.
4 to 5 Good: Minor sensing variables
will not affect sensing reliability.
2 to 3 Low: Minor sensing variables
may affect sensing reliability.
1Poor: Consider an alternate
sensing scheme.
*Following TEACH
NOTE:Highcontrastrelatesdirectlytosensing
reliability; high-contrast sensing applications are
most tolerant of sensing variables (e.g., web flutter or
variations in registration mark color and print density).
Sensor positions
threshold midway
between taught conditions
Sensor positions
threshold midway
between taught conditions
Darkest
(no signal)
Most Light
(saturated
signal)
Single
taught
point
Sensing window size
adjusted by
Manual Adjust
Output OFF Output OFF
Output OFF
Output ON
Output ON
Condition of
Longer Duration
Condition of
Shorter Duration
Position
adjusted by
Manual Adjust
Output OFF Output ON
2nd Taught
Condition
1st Taught
Condition
Position
adjusted by
Manual Adjust
Figure 3. Dynamic TEACH (Light or Dark
Operate, depending on the sensing
condition shown)