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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power treats RD-50R as a legacy-spare or migration project, with stored settings and host integration recovered first.

RD-50R

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KEYENCE RD-50R supports legacy machines that evaluate two analog sensor channels locally while also passing results to control and serial systems.
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Technical specifications for RD-50R

  • Manufacturer:
    KEYENCE
  • Part Number:
    RD-50R
  • Product Family:
    KEYENCE
  • Product Type:
    RD Series RS-232C Analog Sensor Controller
  • Stock:
    1
  • Inputs:
    Two single-ended analog inputs
  • Measurement:
    DC voltage or DC current
  • Ranges:
    +/-5 VDC, +/-10 VDC, 4-20 mA
  • Sampling:
    2000 samples per second
  • Decision Outputs:
    Five NPN outputs
  • Analog Output:
    +/-10 VDC
  • Interface:
    RS-232C
  • Supply:
    24 VDC +/-10%
  • Mass Basis:
    Approximate; fittings excluded
  • Weight:
    0.7 kg
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Japan
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Input Planning Serial Setup Fault Checks Applications

Features:

  • Two-channel evaluation: Separate analog inputs can be scaled and assessed inside one panel controller.
  • Legacy serial integration: RS-232C distinguishes RD-50R from network or interface variants that are not automatic substitutes.
  • Migration evidence point: Stored ranges, limits and outputs define the real replacement requirement after OEM discontinuation.
RD-50R is a signal-processing controller, not merely a display, so configuration recovery is central to replacement.

The five decision outputs, analog retransmission and serial link may serve different consumers in the machine.

Because no direct OEM successor is named, a substitute requires documented functional and wiring validation.

Apter Power can help identify the KEYENCE RD-50R RD Series RS-232C Analog Sensor Controller and coordinate legacy-spare or migration requirements.
KEYENCE RD-50R RD Series RS-232C Analog Sensor Controller Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Range inventory: Record whether each channel uses voltage or current before disconnecting the field signals.
  • Scaling capture: Save engineering-unit conversion, decimal position and any zero or offset treatment.
  • Signal common: Confirm the single-ended return and shield arrangement to avoid migration ground errors.
  • Channel ownership: Trace each input to the sensor and machine function it represents.
  • RS-232C role: Identify the host, cable and message functions before selecting another controller.
  • Parameter backup: Preserve communication settings with the same discipline as measurement configuration.
  • Protocol proof: A powered replacement is not accepted until the host can exchange the required data.
  • Variant boundary: Similar RD interfaces do not prove serial or software compatibility with RD-50R.
  • Local versus remote: Compare display values with host data to isolate measurement and serial faults.
  • Output diagnosis: Verify the programmed limit state before replacing hardware for a missing NPN output.
  • Signal injection: Apply controlled input points to prove scaling, decisions and retransmission together.
  • Supply stability: Check the panel DC source when display resets and serial dropouts occur together.
  • Analog sensor evaluation: Converts two measurement signals into local displays and decision outputs.
  • Limit monitoring: Supports multi-level tolerance decisions for legacy inspection or process equipment.
  • Host data link: Exchanges measurements or control commands through an established RS-232C connection.
  • Brownfield migration: Provides the evidence baseline needed to replace a discontinued controller safely.
Description
Two analog measurements can be displayed and evaluated by RD-50R before decision and retransmission signals are sent onward. In an older machine, that makes the controller part of both the operator indication and the automatic control path.

A normal front-panel reading does not prove every interface around RD-50R. When data is missing, check the sensor input, scaling, decision output, analog retransmission and RS-232C exchange as separate paths before replacing the controller.

With no direct successor identified, a migration should begin by recovering the active ranges, limits, output assignments, communication settings and wiring map from RD-50R. A visually similar controller cannot preserve the application unless those functions are deliberately recreated and tested.
Alternative Names
RD50R
Technical notes
Back up every RD-50R input range, scaling value, tolerance limit, output assignment and serial setting before power is removed. Verify signal common and shield routing when reconnecting. A migration is a control-system change: prove both analog channels, all used decision outputs, retransmission and RS-232C communication before returning the machine to service.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
RD-50R shows a changing local value, but the host display is frozen. Where should troubleshooting begin?
Keep the measurement settings unchanged and check the RS-232C cable, communication parameters and host port before suspecting the analog input.
Can a visually similar RD controller replace RD-50R because the front panel looks the same?
Do not assume that. KEYENCE lists no direct successor; compare interface, wiring, configuration and host integration explicitly.
One RD-50R channel reads correctly while the other drifts. What should maintenance isolate?
Check the affected sensor, selected range, return wiring, shield and scaling before treating the controller as a common failure.
RD-50R output logic is undocumented. How should a migration project reconstruct it?
Back up parameters where possible, inject known signals and record every output transition against the machine sequence.
A used RD-50R is available for an outage spare. What acceptance test is appropriate?
Prove both input ranges, display, used NPN outputs, analog retransmission and RS-232C communication with saved settings.
The RD-50R resets when several outputs change. Which shared cause should be ruled out?
Measure the 24 VDC supply under load and inspect grounding and output wiring before replacing the controller.

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