Rockwell Automation 873P Ultrasonic Single & Dual Discrete Output Sensors Installation Instruction - Manual (Page 3)

873P Ultrasonic Single & Dual Output Sensors 3
Rockwell Automation 873P-IN003A-EN-P—October 2014
One Set Point Function
Dual discrete sensors will trigger ON when a target is detected
between the minimum sensing distance and the user-taught set
point. In this mode, only normally-open logic can be taught.
Set Point 1 (P1)
1. Place the target at the desired set point.
2. With the target still in place, press the teach button.
3. The yellow and green LEDs flash simultaneously, indicating that
the first set point P1 is now set. The sensor is waiting for the sensor
reference point.
Sensor Reference Point
Keep the target in the same position you used to set P1.
With the target still in place, press the teach button for at least
two seconds. With the yellow and green LEDs flashing
simultaneously, press the teach button, then release. The sensor is
ready for use. The minimum sensing distance is indicated in the
Specifications table on page 1.
Single PNP Indicator LED Functions
LED Color Function
A Yellow Output state
B Yellow Teach function
C Green ECHO LED/ Teach function
Double PNP Output LED Function
LED Color Function
A Yellow P1 point in double digital output
B Yellow P2 point in double digital output
C Green ECHO LED/Teach function
N.C.
Pin 4
(BK)
Blind Z
one
H
L
mm P1 = P2 BZ
Pin 2
(WH) L
Minimum Sensing Distance
H
For both Sensor Types: When configuring the
sensor for one set point mode it is very important
that the target is at the exact same distance for
both the first and second push of the teach button.
If the target (or sensor) has moved even slightly the
detected ranges will be different for the two pushes
of the teach button, and the sensor will be
configured for Window Mode.
IMPORTANT
For both Sensor Types: The green and yellow LEDs
flash asynchronously for about two seconds
indicating there is no target present within the
sensing range of the sensor and therefore no set
point to teach. When this happens, the 873P
ignores this teach attempt and restores its previous
settings. By comparison, when an object is
detected during the teach, the yellow and green
LEDs flash synchronously and continue flashing
until the second push of the teach button.
IMPORTANT
LED Indicators: Single PNP Discrete Output
LED Indicators: Dual PNP Discrete Output
§ Green LED indicates that an echo is reflected back to the sensor by an
object, not necessarily the target. Its primary use is for alignment.
‡ For single discrete sensors, LED A will trigger ON/OFF depending on
target position relative to the taught set point(s) and if Normally-open
or Normally-closed logic is used. In the case of a dual discrete sensor,
LEDs A and B will trigger ON/OFF depending on the target position rel-
ative to the taught set points and on the logic used (N.C. or N.O.).
Other Functions
Hold Function
Proceed as follows to inhibit sensor operation and hold the
output to its present state.
PNP Logic: If the SYNC pin is connected to the NEG, the ultrasonic
wave emission is stopped and the digital output is frozen in the
current state. If the SYNC pin is either connected to POS or not
connected, the sensor operates normally.
Lockout Feature for Teach Button
The lockout feature locks the push button to prevent unwanted
teaching of the sensor.
Lock Teach Button: Press the teach button for eight seconds,
until the yellow LEDs A and B flash alternately with the green LED
C. Release the teach button. The push button is now locked.
Unlock Teach Button: Press the teach button for eight seconds,
until the yellow LEDs A and B flash alternately with the green LED
C. Release the teach button. It is once again possible to teach the
sensor.
Synchronization of Ultrasonic Sensors
In this mode, all sensors are connected to a same output on the
PLC. A SYNC pulse simultaneously drives all sensors connected to
the PLC output. When mounting the sensors, attention must be
paid to a minimum distance between the sensors; said distance
Operating
Mode
Green LED
(Alignment)
Yellow LED A
(Output)
Yellow LED B
(Teach)
Standard Operation
Target Present ON § ON/OFF ‡ OFF
Target Absent ON/OFF § ON/OFF ‡ OFF
Operating
Mode
Green LED
(Alignment)
Yellow LED A
(Output)
Yellow LED B
(Teach)
Standard Operation
Target Present ON § ON/OFF ‡ ON/OFF ‡
Target Absent ON/OFF ON/OFF ‡ ON/OFF ‡
1
2
3
4
(Yellow)
Teach
(Green)
Echo/teach
(Yellow)
Output state
Teach button
M18 LEDs
Teach button
Yellow LED B
Teach function
Yellow LED A
output state
Green LED C
A B
C
M30 LEDs
Echo LED/teach function