Banner R58 Registration Mark Sensors Manual de usuario descargar pdf (Pagina 5)

P/N 122928 rev. C 5

Banner Engineering Corp.•Minneapolis,MNU.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.

WhenDynamicTEACHisused,theOutputONstatewillbetheshorterduration(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

maximumfeedratecanbedeterminedwiththefollowingformula:

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:Registrationmarksnarrowerthanthe1.2mmsensingimagewidthcanbedetectedat

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

•Pressandholdthe

Dynamic push button

for > 2 seconds.

•Holdtheremotelinelow

for > 2 seconds.

LO and DO: Alternately ﬂash Green

Output: OFF

Bargraph display: Goes OFF

Teach Sensing

Conditions

•ContinuetoholdDynamic

push button.

•Presentsensingconditions

(present registration mark

at least twice).

•Continuetoholdtheremote

line low.

•Presentsensingconditions

(present registration mark

at least twice).

LO and DO: Alternately ﬂash Green

Output: OFF

Bargraph display: Remains OFF

Return to RUN Mode

•ReleasetheDynamic

push button.

•Releaseremoteline/switch. Teach Accepted

•Bargraphdisplayashesonesegmentforthreesecondstoindicate

relative contrast (see contrast table above).

•SensorentersRUNmode.

Teach Unacceptable

•Pairsofbargraphdisplaysegmentsashinunisonforthreesecondsto

warn of unacceptably low contrast.

•SensorreturnstoRUNmodewithoutchangingsettings.

T T T T

0.8 seconds

> 2 seconds

T T

T T T

T T

TT T

TT T T

T T

TT T

T T T

T T

TT T

TT T T

T T

T T T T

0.8 seconds

> 2 seconds

T T

T T T

T T

TT T

TT T T

T T

TT T

T T T

T T

TT T

TT T T

T T

T T T T

0.8 seconds

> 2 seconds

T T

T T T

T T

TT T

TT T T

T T

TT T

T T T

T 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.

Poor: Consider an alternate

sensing scheme.

*Following TEACH

NOTE:Highcontrastrelatesdirectlytosensing

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

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)

1 2 3 4 5 6 7 8 9 10 11 12

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