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Business > Industrial Devices > Automation Controls Top > Service & Support > FA Technical Support > Technical Guide (FA Sensors) > Photoelectric Sensors > Functions
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The sensor diagnoses the incident light intensity, and if it is reduced due to dust or dirt, or beam misalignment, a visual indication and/or an output is generated.
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(1) | : | The self-diagnosis output transistor stays in the "OFF" state during stable sensing. |
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(2) | : | When the sensing output changes, if the incident light intensity does not reach the stable light received level or the stable dark level, the self-diagnosis output becomes ON. Further, the self-diagnosis output changes state when the sensing output changes from Light to Dark state. (It is not affected by the operation mode switch.) |
(3) | : | In case of insufficient beam interruption, there will be a time lag before the self-diagnosis output turns ON. |
Incident light intensity can be displayed numerically or by an LED array.
Incident light intensity can be shown on a digital display (4 digit LED or LCD).
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Using the optional sensor checker CHX-SC2, the incident light intensity can be checked audio-visually.
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Sensitivity (threshold value) setting is done simply by pressing a button.
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Note : | The FX-300 series and LS series are equipped with a jog switch. The FX-500 series, FX-100 series, and LX-100 series use button operations. |
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The FX-500 series, FX-100 series, FX-300 series, LS series and LX-100 series feature a full autoteaching function by which sensitivity setting can be done on a moving object without stopping the assembly line. Further, in case of the FZ-10 series and SU-7 series, sensitivity setting is done by using a button switch.
The timing of sensing can be controlled.
Time chart (with SU-75)
Edge trigger | Gate trigger | |
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Sensing signal | ||
External sync. input | ||
Sensing output |
T≥0.6 ms (when the interference prevention function is used, T≥0.8 ms)
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The stability indicator (green) lights up when the incident light intensity has sufficient margin with respect to the operation level. If the incident light intensity level is such that the stability indicator lights up, stable sensing can be done without the light received operation and the light interrupted operation being affected by a change in ambient temperature or supply voltage.
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Depending on the positional relation between the background and the sensing object, either the BGS or FGS function will be selected.
The sensor judges that an object is present when light is received at position A of the light-receiving element (2-segment element).
This is useful if the object and background are far apart. The distance adjustment method is the same as the conventional adjustment method for adjustable range reflective type sensors.
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The sensor judges that an object is present when no light is received at position B of the light-receiving element (2-segment element).
Accordingly, even objects that are glossy can be sensed. This is useful if the object and background are close together, or if the object being sensed is glossy.
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When several photoelectric sensors are mounted close together, mutual interference can be prevented by setting different emission frequencies. Interference prevention function by which the emission frequency can be changed by a switch or an interference prevention wire, or, automatic interference prevention function by which the frequency is automatically changed by the sensor are available.
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The width of the output signal is controlled to match the connected device specifications.
Function | : | Neglects short output signals. |
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Application | : | As only longer signals are extracted, this function is useful for detecting if a line is clogged, or for sensing only objects taking a long time to travel. |
Function | : | Extends the output signal for a fixed period of time. |
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Application | : | This function is useful if the output signal is so short that the connected device cannot respond. |
Function | : | Outputs a fixed width signal upon sensing |
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Application | : | This function is useful when the input specifications of the connected device require a signal of fixed width. Of course, it is also useful for extending a short width signal to a desired width. |
Time chart
Sensing condition | |
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Operation | |
Light-ON normal operation |
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Light-ON ON-delay |
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Light-ON OFF-delay |
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Light-ON ONE SHOT |
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Dark-ON normal operation |
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Dark-ON ON-delay |
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Dark-ON OFF-delay |
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Dark-ON ONE SHOT |
T : Timer period
The FX-500 series, FX-305(P) is equipped with an ON-delay / OFF-delay timer that allows you to use ON and OFF-delay simultaneously as well as an ON-delay / ONE SHOT timer enabling a simultaneous ON-delay and ONE SHOT.
The sensitivity is adjusted according to the setting distance to maintain the optimum sensitivity.
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The sensitivity is reduced if the emitter and the receiver are brought closer.
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The sensitivity is increased in case of dust or dirt.
The emission can be stopped by an external test input.
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When several sensors are arrayed in a line, this function can also be used for mutual interference prevention by controlling the beam emission in a cyclic manner.
Note : | Set the operation setting to light-ON for FX-502(P). |
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Requests to customers (Automation Control Components & Industrial Device) [For specific product]
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