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2operation, Diagnostic output, Adjustments and indicators – Rockwell Automation 9000 Diagnostic User Manual

Page 2: Static and dynamic diagnostic operating modes, Indicators (left to right)

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Operation

Series 9000 Diagnostic photoelectric sensors provide

additional information about the operation of the sensor and

application. A separate discrete output signal is provided

when a failure has been detected or when there is

insufficient application quality. The exact nature of the

failure or application problem is communicated through a

series of LED indicators on top of the sensor.
Other standard Series 9000 features are built into these

sensors, see page 1-33 of the C112 Sensor catalog for a

description.

Diagnostic Output

The Diagnostic Output signals that the sensor may be

operating in an unstable state or that a sensor output is

shorted/overloaded.

Insufficient Application Quality

The sensor measures margin values to determine

application quality. If the operating margin for an application

is too high or too low, the diagnostic output will change

state.
In a diffuse application, the peak margin when detecting the

target may be too low (operating margin 1.0 to 1.5), or the

margin when detecting the background may be too high

(operating margin 0.7 to 0.99). In a retroreflective or

polarized retroreflective application the margin when

detecting the reflector or reflective tape may be too low

(operating margin 1.0 to 1.5) or the margin when target is

detected may be too low (operating margin 0.7 to 0.99).
The LED indicators will identify the specific application

problem. Refer to Indicators for a description.

Overload or Short Circuit at Outputs

10-30V DC sensors have a single output that is switch

selectable for NPN or PNP and Light Operate or Dark

Operate. If a short circuit or overload is detected in the

output, the diagnostic output will change state. The LED

indicators will provide information about this condition, refer

to Indicators for a description.

Adjustments and Indicators

Refer to the Top View illustrations on the right.

Switch Selectable Features

• NPN/PNP (DC sensors only)ĊSelect NPN or PNP

Sensor and Diagnostic Outputs

• NC/NOĊConfigure Diagnostic Output for Normally

Open or Nomally Closed operation

• DK/LTĊConfigure Sensor output for Dark Operate (DK)

or Light Operate (LT)

• STAT/DYNĊSelect Static or Dynamic Diagnostic

Output Operation (see below)

P

N

P

DIAG

N

C

D

K

S

T

A

T

N

P

N

N

O

L

T

D

Y

N

SENSITIVITY

POWER
FLASHING

TGT SIGNAL LOW

FLASHING

NON-TGT

SIGNAL HIGH

STABILITY

FLASHING

SCP

OUT

Top View Detail (DC)

DIAG

N

C

D

K

S

T

A

T

N
O

L
T

D
Y
N

SENSITIVITY

POWER
FLASHING

TGT SIGNAL LOW

FLASHING

NON-TGT

SIGNAL HIGH

STABILITY

OUT

Top View Detail (AC/DC)

Indicators

The function of the LED indicators is shown in the table in

the last column on this page (from left to right). Whenever

the Yellow indicator is On steady, the sensor is operating in

a stable condition and there are no faults. Whenever the

sensor is powered, but the Yellow indicator is off or flashing,

the flashing indicators will show the source of the problem.

Static and Dynamic
Diagnostic Operating Modes

Static or Dynamic diagnostic sensing modes are switch

selectable.
The Static mode is designed for web sensing or other

applications in which an immediate diagnostic output is

required when an unstable sensing condition occurs

(operating margin is greater than 0.7 and less than 1.5).

The Dynamic mode is useful in repetitive applications

where targets are constantly moving into and out of the

sensor's field of view. These applications could include

packages moving on a conveyor, material on a moving

product line, etc. To minimize nuisance" diagnostic outputs

due to occasional, random fluctuations in operating margin,

sensors set in the Dynamic mode provide a diagnostic

output only after detection of seven successive unstable"

signals.

Dynamic Diagnostic Operating Mode
(refer to illustration on next page)

Condition 1: The amount of reflected light detected by the

sensor when the target is present (diffuse sensing) or when

the target is absent (retroreflective, polarized retroreflective,

or transmitted beam sensing) is too low. This may be due to

dust or dirt on the lenses or misalignment. The Diagnostic

Output changes state after the sensor senses 7

consecutive low margin signals from these targets

(operating margin below 1.5). At the same time the yellow

TGT SIGNAL LOW indicator flashes and the red

STABILITY indicator turns off.
Corrective Action: Clean the lenses and/or realign the

sensor(s). The Diagnostic Output will return to the original

state when a stable operating margin (operating margin of

1.5 or greater) is achieved. The yellow TGT SIGNAL LOW

indicator stops flashing and the red STABILITY indicator

turns on.
Condition 2: The amount of light detected by the Receiver

when the target is absent (diffuse sensing) or when the

target is present (retroreflective, polarized retroreflective, or

transmitted beam sensing) is too high. This may also be

due to a reflective background (diffuse sensing) or targets

that are too small or translucent for reliable sensing

(retroreflective, polarized retroreflective, or transmitted

beam sensing). The Diagnostic Output changes state after

the sensor senses 7 consecutive high margin signals

(operating margin remains above 0.7). At the same time the

green NONĆTGT SIGNAL HIGH indicator begins to flash

and the red STABILITY turns off.
Corrective Action: Reduce the sensitivity of the sensor (both

Light Source and Receiver intensity are adjustable on

transmitted beam sensors) and/or reposition the sensors

and targets. The Diagnostic Output will return to the original

state when a stable operating margin (below 0.7) is

achieved. The green NONĆTGT SIGNAL HIGH indicator

stops flashing and the red STABILITY indicator turns on.

Static Diagnostic Operating Mode
(refer to illustration on next page)

The Diagnostic Output changes state immediately

whenever the detected margin is between 0.7 and 1.5

indicating that the application is unstable. Both the green

NONĆTARGET SIGNAL HIGH and yellow TARGET SIGNAL

LOW indicators will flash. The indicators will stop flashing

and the Diagnostic Output will return to the original state

when a stable operating margin is achieved (below 0.7 or

above 1.5).

Indicators (Left to Right)

Diagnostic Operating Mode

Label

ColĆ

or

State

Static

Dynamic

POWER

Yellow

On Steady

Sensor Power On

FLASHING

TGT

SIGNAL

LOW

Flashing

Unstable

operation

(0.7 <

Margin <

1.5)

1.0 < Margin > 1.5 for seven

successive operations

Diffuse: Target margin too low

Retro / Polarized Retro: ReĆ

flector margin too low

Transmitted Beam unbroken

beam margin too low

FLASHING

NON-TGT

SIGNAL

HIGH

Green

Flashing

Unstable

operation

(0.7 <

Margin <

1.5)

0.7 < Margin < 1.0 for seven

successive operations

Diffuse: Background margin

too high

Retro / Polarized Retro: Target

margin too high

Transmitted Beam broken

beam margin too high

STABILĆ

ITY(1)

FLASHING

SCP

Red

On Steady

Stable operation (Margin < 0.7 or Margin > 1.5)

Off

Unstable operation (0.7 < Margin < 1.5)

Flashing(2)

Overload or short circuit at sensor output

OUTPUT

Green

On

Output energized

(1) To prevent potentially confusing indications during rapid signal transi-

tions, the red STABILITY indicator has a typical delay of 100ms before
it turns off.

As a result, the indicator will not turn off for quick, brief events. (The

Diagnostic Output has no delay.)

(2) 10–30V DC sensors only.