Rockwell Automation 873M Ultrasonic Discrete Sensors Installation Instructions - Manual (Page 2)

10000229947 Ver 01
September 2012
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Adjusting Switching Points
Pertaining to the 873M, there are five modes of operation in
detecting a target object in discrete mode.
Window Mode, N.O: Two set points are taught in defined
sensing range creating a sensing window. Once a target
object passes through the window, the output triggers on.
Window Mode, N.C.: Two set points are taught in the
defined sensing range creating a sensing window. Output
is initially ON. Once a target object passes through the
window, the output triggers off.
One set point, N.O.: One set point is taught within a
defined sensing range of the sensor with the output off.
When a target passes between the sensor and the taught
set point, the output triggers and turns on.
One set point, N.C: One set point is taught within a defined
sensing range of the sensor while the output is on. When a
target passes between the sensor and the taught set point,
output triggers and turns off.
Object Presence Mode: Also known as resetting to factory
defaults settings. Once the sensor is taught, all set points are
removed and the sensor returns to the factory default
specified range depending on the catalog number. Any object
will be detected within a specified sensing range [50…300 or
70…800 mm (1.96…11.81 or 2.75…31.49 in.)]
Window Mode, N.O.:
1. Place the target at the desired near-set point.
2. Using the white wire, connect to (0V DC (-)) or press A1 on
the optional programming cable.
3. Set the target to desired far-set point.
4. Using the white wire, connect to (10…30V DC (+)) or press
A2 on optional programming cable.
Window Mode, N.C.:
1. Place the target at the desired near-set point.
2. Using the white wire, connect to (10…30V DC (+)) or press
A2 on the optional programming cable.
3. Set the target to desired far set point.
4. Using white wire, connect to (0V DC (-)) or press A1 on
optional programming cable.
One Set Point, N.O:
1. Place target at desired set point.
2. Using white wire, connect to (10…30V DC (+)) or press A2
on optional programming cable.
3. Cover sensor head with hand or remove all objects from
sensing field.
4. Using the white wire, connect to (0V DC (-)) or press A1 on
the optional programming cable.
One Set Point, N.C:
1. Place target at desired set point.
2. Using the white wire, connect to (0V DC (-)) or press A1 on
the optional programming cable.
3. Cover sensor head with hand or remove all objects from
sensing field.
4. Using the white wire, connect to (10…30V DC (+)) or press
A2 on the optional programming cable.
Object Presence Mode (Factory Default Mode):
1. Cover sensor head with hand or remove all objects from
sensing field.
2. Using the white wire, connect to (0V DC (-)) or press A1 on
the optional programming cable.
3. Using the white wire, connect to (10…30V DC (+)) or press
A2 on the optional programming cable.
Wiring
Dimensions [mm (in.)]
1 (Brown)
2 (White)
3 (Blue)
4 (Black)
+10…30V DC
Remote teach
0V DC
Switch output
50.2 (1.98)
39.2 (1.54) 10
(0.39)
24.5 (0.96)
LED
M18X1 M12X1
4
(0.16)
67.7 (2.67)
39.2 (1.54) 10
(0.39)
24.5 (0.96)
LED
M12X1
M18X1
4
(0.16)