FS2-60P SHA22 (FS260P) Fiber Amplifier Sensor FS2-60P FS260P FS2-60P

Keyence FS2-60P | Fiber Optic Sensor Amplifier — PNP, 12–24VDC, 250µs, 8-Turn Trimmer, LIGHT-ON/DARK-ON, Buzzer, Long Range, DIN Rail

Overview

The Keyence FS2-60P is a DIN-rail-mounted fiber optic amplifier from Keyence's FS2 series, providing a PNP output for the sensing head connected through the fiber optic cable.

It amplifies and processes the light signal received from the attached fiber unit, applying digital threshold comparison to determine whether a target is present, and switching its PNP output accordingly.

The 250 µs response time, 8-turn sensitivity trimmer for long-distance detection, and built-in buzzer capability make it a fully featured amplifier suited to the demanding detection tasks that basic fiber amplifiers cannot handle reliably.

The long-detecting-distance trimmer type designation reflects the FS2-60P's specific calibration optimised for detecting objects at the extended range that long-barrel or coaxial fiber optic units provide.

Where standard fiber amplifiers set their threshold in a narrow sensitivity range suited to close-range diffuse detection, the FS2-60P's 8-turn trimmer provides fine sensitivity adjustment across the wider range needed to distinguish target presence reliably at extended distances — where the signal difference between target and background is smaller and requires finer threshold placement.

Two separate outputs — the control output and the stability output — provide different information to the machine controller.

The control output (100 mA max) switches ON and OFF as the detection state changes, providing the primary sensing signal.

The stability output (50 mA max) indicates whether the measured light level is within the stable detection zone — a margin indicator that warns of marginal detection before the control output begins to show false triggers. Monitoring the stability output gives advance warning that the sensor setup needs adjustment (fiber contamination, target position drift, or surface condition change) before a detection error occurs in production.

Key Specifications

8-Turn Sensitivity Trimmer — Precision Threshold for Long Range

Standard photoelectric and fiber amplifiers use a single-turn or coarse potentiometer for threshold adjustment, which is adequate for close-range detection where the signal is strong and the threshold placement is not critical.

At longer sensing distances, the signal margin — the difference between the detected light level with target present and with target absent — shrinks. Setting the threshold in the narrow window between these two levels requires fine adjustment that a coarse trimmer cannot provide.

The 8-turn trimmer on the FS2-60P provides the resolution to place the threshold precisely in this narrow window. Eight full turns of the adjustment knob span the entire sensitivity range, giving the installer control at one-eighth the coarseness of a single-turn equivalent.

This directly translates to stable, reliable detection at the extended ranges that the long-distance fiber units in the FS2 system achieve, where a marginally misplaced threshold would produce intermittent outputs under production conditions.

LIGHT-ON / DARK-ON, Timer, and Buzzer — Field Configuration Without Rewiring

Three functions on the FS2-60P are switch-selectable at the unit rather than hardwired at installation:

LIGHT-ON / DARK-ON determines the output polarity relative to the detected light level. LIGHT-ON: output switches ON when light is received (target present in reflective mode, target absent in through-beam mode).

DARK-ON: output switches ON when light is blocked. Changing from one to the other requires flipping a switch — no wiring change, no part number change.

Timer modes provide 40ms ON-delay or OFF-delay, or timer bypass. These suppress brief switching events — target edge detection, vibration-induced momentary blocking — without filtering genuine detection events that exceed 40ms duration.

This is the common solution for reducing nuisance alarms from vibrating targets or high-frequency part-passing without sacrificing detection speed for slower events.

Buzzer modes provide audible feedback during operation — sounding when the control output switches ON, when the stability output (alarm) activates, or silent.

The buzzer is most useful during initial setup for adjusting the threshold while observing the target, and in monitoring applications where audible confirmation of detection events supplements the LED indicators.

FAQ

Q1: The FS2-60P is discontinued — what is the current equivalent?

Keyence recommends the FS-N40 series as the current replacement for the FS2 series. The FS-N40 series provides equivalent PNP/NPN output options, comparable response times, and improved display and calibration features over the FS2 generation.

The FS-N series uses the same Keyence fiber optic cable system, so existing fiber units connected to FS2 amplifiers can be reused with FS-N40 amplifiers. Verify the fiber connector compatibility with the specific FS-N40 model before installing.

Q2: What is the stability output, and how should it be used in a machine control system?

The stability output reflects the detection margin — whether the received light level is within the stable detection zone or is approaching the threshold edge where false switching becomes possible. When the stability output is ON (in its defined state), detection is reliable.

When it switches, it signals marginal detection before the control output becomes unreliable.

Wire the stability output to a PLC input and configure a maintenance alarm when the stability output activates: this is advance warning that the fiber needs cleaning, realignment, or replacement before a detection fault causes a machine stop.

Q3: Can the timer functions be used simultaneously in LIGHT-ON and DARK-ON modes?

Yes. The timer function operates on the control output regardless of LIGHT-ON or DARK-ON mode selection.

The timer delays the output change (ON-delay: delays the switch from OFF to ON by 40ms; OFF-delay: delays the switch from ON to OFF by 40ms). Both the operation mode switch and the timer switch are independent — any combination of LIGHT-ON/DARK-ON with timer ON-delay/OFF-delay/bypass is valid.

Q4: What fiber units are compatible with the FS2-60P?

The FS2-60P is compatible with Keyence's FS-series fiber units including the FU-series coaxial, standard diffuse, and through-beam types designed for the FS2 amplifier system. The fiber units plug into the amplifier's fiber input ports — emitter and receiver ports for through-beam, single port for diffuse types.

When using through-beam units, both the emitter and receiver fibers connect to the FS2-60P's two fiber ports; the amplifier drives the emitter and receives the detector fiber signal simultaneously.

Q5: The current consumption is listed as 35 mA — does this include the load current drawn through the control output?

No. The 35 mA current consumption is the supply current the amplifier itself draws from the 12–24V DC supply for its internal circuitry — oscillator, comparator, indicator LEDs, buzzer.

The output load current — the current flowing through the PLC input or relay coil connected to the control output — adds to this supply current draw. Total supply current is 35 mA (sensor) plus load current (up to 100 mA for control output).

For supply sizing, assume up to 135 mA total at the amplifier's supply terminals if the output is loaded to its full 100 mA rating.