Self-diagnostic function |
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| When optical misalignment or debris collects on the lens, as shown below, the received light quantity decreases and results in unstable detection. The alarm output will then activate to inform the operator of the need for maintenance service. |
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Misaligned optical axis |
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Dirt or dust accumulated on lens |
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Color differentiation charts |
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For color differentiation, choose a light source (Red LED or Green LED) that produces a distinct difference in the reflectance of the
2 colors to be differentiated (i.e. select a light source that allows the sensitivity adjustment trimmer
setting positions corresponding to the 2 colors being discriminated to be as far apart as possible).
The charts shown here give reference data for color differentiation. Detection is, however, affected by the surface condition
and luminosity of the target. Confirm the sensitivity difference of the colors to be differentiated using the actual target.
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The received light level is a value which numerically expresses the light quantity received by the sensor. |
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The above are sample colors. Note that they may differ slightly from those used in obtaining the data due to print quality. |
How to see the chart |
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The chart shows the difference in received light quantity
between the FS-T1 and FS-V1 (red LED) and the FST1G
(green LED) manufactured by KEYENCE.
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Guide of color differentiation |
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When the received light level of one color is 110% or
more of the intermediate value of the two color to be
differentiated, the sensor stably detects the light being
received. When the received light level is 90% or less,
the sensor stably detects the light being interrupted.
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Example: To differentiate red and white
From the chart, the FS-T1 (red LED) shows similar
received light level of white and red; while the FS-T1G
shows some difference. To calculate the excess gain of
color differentiation,
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The sensor stably detects the light being interrupted.
Therefore, the FS-T1G can stably differentiate red and white targets. |
Connections |
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Connection to PLC (NPN open-collector type) |
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Parallel connection (OR logic circuit) and serial connection (AND logic circuit) |
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OR logic circuit
(for NPN open-collector output sensors) |
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AND logic circuit
(for NPN open-collector output sensors) |
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For AND circuit, select the operation mode opposite of that actually required.
If LIGHT-ON output is required, select the DARK-ON mode. |
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Downloads
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