IFM Electronic O1D155

The O1D155 operates as an optical distance sensor, capable of measuring distances between 0.3 and 6 meters. It incorporates a background suppression feature that effectively ignores objects beyond a range of 6 to 100 meters, ensuring accurate readings within the desired sensing area. The sensor provides two configurable output signals based on the set output functions, allowing for flexible integration into various applications.

The sensor offers several output functions:

Hysteresis Function: This function stabilizes the switching state of the output when the measured value fluctuates around the sensing range. Both outputs (OUT1 and OUT2) can be configured for hysteresis. The set and reset points are symmetrically arranged around a selected switch point. Hysteresis is calculated based on the repeatability with a safety factor of 1.5. For an "Hno" (normally open) configuration, the output switches when an object approaches and reaches the set point (A). It will not switch back until the object is removed and the reset point (B) is exceeded, where B is greater than A. Conversely, for an "Hnc" (normally closed) configuration, the output switches off when the object approaches and switches on when it is removed.
Window Function: This function enables the monitoring of a defined acceptable range. Both outputs (OUT1 and OUT2) can be set as window functions. This allows the sensor to detect if an object is present or not present within a specified "near" and "far" distance. The window limit values ([nSPx] and [FSPx]) also incorporate a switching hysteresis for stable operation.
Analogue Output Function: The sensor can provide an analogue signal on output 2 (OUT2) that is proportional to the measured distance. This output can be configured as either a current output (4-20 mA) or a voltage output (0-10 V). The analogue start point (ASP) defines the measured value at which 4 mA / 0 V are provided, and the analogue end point (AEP) defines the measured value for 20 mA / 10 V. The AEP can be set before the ASP to implement a falling edge. A minimum distance of 100 mm is required between ASP and AEP.

For safety and maintenance, the laser of the unit can be temporarily switched off via an input on pin 5. A "Low" signal or no connection keeps the laser "On," while a "High" signal switches it "Off."

The unit is compatible with IO-Link master port class A (type A). For operation with IO-Link master port class B (type B), specific wiring configurations are required due to the shared supply voltage on pins 2 and 5.

Usage Features

The O1D155 features a 10-segment display that shows the measured value. Operating and display elements include:

Green LEDs (4x): Indicate power and the selected display unit (mm, m, inch).
Yellow LEDs (4x): Indicate the switching status of the outputs; they light up when the corresponding output is switched.
4-digit alphanumeric display: Shows the measured distance, parameters, and parameter values.
[SET] Programming button: Used for setting parameter values (scrolling by holding, incrementing by pressing once).
[MODE/ENTER] Programming button: Used for selecting parameters and acknowledging parameter values.

The sensor operates in several modes:

Run Mode: The normal operating mode after power-on. The unit performs its monitoring function and generates output signals based on the set parameters. The display shows the current distance, and yellow LEDs indicate output switching status.
Display Mode: Accessed by briefly pressing [MODE/ENTER]. This mode allows users to view parameters and their set values. The unit remains internally in operating mode. Parameters can be scrolled through by pressing [MODE/ENTER], and their values displayed by pressing [SET]. The unit returns to Run mode after 15 seconds of inactivity.
Object Reflectivity Mode: Accessed by pressing [SET] in Run mode. The unit displays an orientation value for object reflectivity (e.g., +100 for a white object, +020 for a grey object). This value is also available as a process data value via IO-Link.
Programming Mode: Used for setting parameter values. The unit continues its monitoring function with existing parameters until changes are confirmed.

Parameter setting involves selecting the display unit first to avoid rounding errors. Parameters are selected using [MODE/ENTER], values are set using [SET] (pressed and held to flash, then incremented by single presses), and confirmed with [MODE/ENTER]. The unit can be electronically locked to prevent unintentional settings.

Extended functions include:

Time Delay for Switching Outputs: Configurable switch-on ([dSx]) and switch-off ([drx]) delays (0 to 5 seconds in 0.1-second steps).
Fault Suppression Time for Measured Signal: Configurable damping ([dFo]) time (0 to 5 seconds) to suppress short-term saturation from direct reflection or strong brightness fluctuations. During this delay, the last valid measured value is displayed, and output signals remain unchanged. This also suppresses "too much light" and "not enough light" error types.
Display Settings: Seven options for updating the measured value display (50 ms, 200 ms, 600 ms, and rotated versions), or deactivating the display in Run mode. LEDs remain active even if the display is off.
Restore Factory Setting: Resets all parameters to their default values.
Software Version Display: Shows the current software version number.

IO-Link functionality provides direct access to sensor values and parameters, allowing for configuration during operation. It also supports extended functions like "Teach on background" and "Two-point teaching," detailed in the IODD (IO-Link Device Description). Object reflectivity is provided via the display and as a process data value, useful for detecting sensor soiling.

Maintenance Features

The O1D155 is designed for reliable operation with minimal maintenance.

Faulty sensors: Must only be repaired by the manufacturer.
Front lens: Should be kept free from soiling to ensure accurate measurements.
Disposal: After use, the unit should be disposed of in an environmentally friendly manner, in accordance with applicable national regulations.
Laser diode lifetime: The laser diode has a lifetime of 50,000 hours.
Fault Indication: The unit provides various fault indications on the display, such as "too much light" ([++]), "too little light" ([--]), "object too near" ([nEAr]), "object too far" ([FAr]), "plausibility error" ([Errp] for objects moving too fast), "laser switched off" ([LOFF]), and "short circuit" ([SC1], [SC2], [SC]). These indications help in diagnosing and troubleshooting operational issues.

IFM Electronic O1D155 Specifications

General

Wavelength	650 nm
Housing material	Plastic
Lens material	PMMA
Protection	Reverse polarity protection
Light source	Laser
Laser protection class	2 (IEC 60825-1)
Supply voltage	10-30 V DC
Operating temperature	-25 to +60 °C
Storage temperature	-40°C to +70°C