Analog proximity sensor standards guide
IEC 60947-5-7 Explained for Analog Sensors: Scope, Evidence and Acceptance
IEC 60947-5-7:2024 defines requirements for proximity devices with analog output. It can help you compare a PDAO claim, but it does not replace a model-specific review of the sensing principle, target, output mapping, cable, receiver, environment and acceptance test.
The standard is a product framework, not a universal approval for every 0-10 V or 4-20 mA transmitter. Before buying or approving a model, match the exact device function, model suffix, edition, target or process, configured range, output load, environment and supporting documents.
| What you need to decide | What to check | When to stop the approval |
|---|---|---|
| Is the product in the right family? | Intended function, sensing principle, measurand and declared standard scope. | The supplier names only the output, such as 4-20 mA, but does not identify the product family. |
| Will the analog value mean the right thing? | Target or process reference, start and end points, direction, load, cable and receiver input. | The data sheet omits the reference target, mapping conditions or receiving-circuit limits. |
| Can the machine accept the result? | Linearity, repeatability, hysteresis, drift, response, settling, noise and PLC scaling at operating conditions. | The quoted performance is typical only, or the installed target and signal chain have not been tested. |
| Is the claim supported by evidence? | Exact model and suffix, current edition, configuration, test conditions, report or declaration and change control. | The document applies only to a product family or a different configuration. |
Start with classification
What does IEC 60947-5-7 cover for analog sensors?
IEC 60947-5-7:2024 covers proximity devices that correspond to the scope of IEC 60947-5-2:2019 and use analog output, or a digital output that transmits a corresponding digital value for the detected sensing input. The device may also provide additional parameters.
| Product question | What the 5-7 claim may support | What still needs separate proof |
|---|---|---|
| What is being sensed? | A proximity function based on an in-scope sensing principle and a defined physical input. | Your target material, dimensions, geometry, process window and production variation. |
| What is being transmitted? | An analog value, such as a documented voltage or current range, or a corresponding digital value. | Receiver compatibility, cable voltage drop, burden, grounding, PLC conversion and program scaling. |
| What is being verified? | Declared characteristics, performance, influence quantities and relevant test conditions for the product. | Whether your final model, settings, target, bracket and machine speed meet the machine requirement. |
Important boundary: a standard number on a brochure is not enough. Ask which exact model, suffix, firmware, output configuration and test conditions are covered.
Related standards
How does it relate to IEC 60947-5-2, IEC 61131-9 and IEC 62828?
These standards answer different questions. Keeping the boundaries clear prevents a signal interface from being mistaken for a complete product, safety or process-transmitter approval.
| Reference | Question it answers | What it does not decide by itself |
|---|---|---|
| IEC 60947-5-2:2019 | Does the proximity-switch scope cover inductive, capacitive, ultrasonic, photoelectric or non-mechanical magnetic sensing? | Whether an analog-output device has the additional 5-7 characteristics and evidence for its exact configuration. |
| IEC 60947-5-7:2024 | What requirements apply to an in-scope proximity device with analog output or a corresponding digital value? | Whether your target, bracket, cable, PLC input and operating conditions meet the machine requirement. |
| IEC 61131-9:2022 | How does the SDCI interface, commonly known as IO-Link, exchange data and parameters between a small sensor and its master? | Whether an IO-Link label alone makes a product a PDAO or proves 5-7 conformance. |
| IEC 62828-1:2026 | How should industrial and process measurement transmitters be tested under reference conditions? | It expressly excludes sensing devices in the IEC 60947 series, so the device function must be classified first. |
| IEC 60947-5-3:2026 | What additional requirements apply to proximity devices with defined behavior under fault conditions? | It does not define the analog-output requirements of a PDAO and does not replace a functional-safety assessment. |
Read the signal correctly
What should 0-10 V and 4-20 mA data tell you?
Both output ranges can represent a physical measuring span. The range alone does not tell you the sensing principle, accuracy, fault behavior or compatibility with the receiving equipment.
0-10 V: check the receiving input
Confirm input impedance, reference potential, voltage drop, cable routing and the meaning of the lower and upper limits. A voltage output can be correct at the sensor terminals but shift at the controller when the reference or wiring changes.
4-20 mA: check the loop burden
Confirm compliance voltage, total loop burden, cable resistance, barrier or isolator loading and product-specific fault behavior. The receiving circuit must leave enough voltage headroom for the sensor to reach its declared output.
Both outputs: confirm the same measurement meaning
For either interface, document the physical range, mapping direction, load, ripple, filtering, response time and controller scaling. The value shown in the PLC should be traceable back to a defined physical reference.
| Check | 0-10 V | 4-20 mA |
|---|---|---|
| Basic mapping | Often 0 V at the lower configured point and 10 V at the upper configured point. | Often 4 mA at the lower configured point and 20 mA at the upper configured point. |
| Receiving circuit | Requires a compatible input impedance and a controlled reference potential. | Requires enough supply headroom for the sensor, cable, receiver, barrier and other loop devices. |
| Typical risk | Reference errors, ground potential difference and voltage drop can change the value seen by the controller. | Insufficient compliance voltage or excessive burden can limit the output before the physical range is reached. |
| Do not assume | 0 V is always a unique fault indication or that the output is accurate at every point. | 4 mA and 20 mA fault thresholds, under-range behavior or over-range behavior are universal. |
Performance language
Which performance terms must be defined before comparing sensors?
Do not compare one number called accuracy until you know its reference, conditions, included error terms and whether it is typical or guaranteed.
Static measurement terms
- Linearity
- How closely the output follows a reference transfer curve. It may exclude offset, drift, target effects and installation errors unless the supplier defines the complete error.
- Repeatability
- How consistently the sensor returns to the same value under repeated conditions. A repeatable reading can still be offset from the desired value.
- Hysteresis
- The difference in output at the same physical point when the target approaches and retreats. This matters when the machine reverses direction.
- Resolution and noise
- The smallest useful change must be considered with analog noise, ripple, mechanical movement, ADC steps and controller filtering. A fine digital value does not remove physical noise.
Temperature and timing terms
- Temperature effect
- The output change across the operating temperature range. A room-temperature result may not represent cold start, enclosure heating, washdown or a long shift.
- Response and settling
- The time needed to deliver a usable value. Sensor dynamics, output filtering, communication updates, PLC conversion and scan time can all delay the machine decision.
Use a tolerance budget: start with the maximum error the machine can accept, then reserve allowance for the target and mechanics, the sensor, and the cable, receiver and conversion. A sensor specification that consumes the entire budget leaves no operating margin.
Supplier evidence
What conditions should a supplier document?
What should the product sheet make explicit?
Official manufacturer data sheets show the level of detail buyers should expect. For example, the ifm II5987 product page states a measuring range and 4-20 mA output together with reference-target, material-correction, load, linearity and repeatability information. A Balluff BAW technical document similarly connects its 0-10 V range with target, temperature, nonlinearity, repeatability and drift data.
Why must the model and configuration match?
These examples are not endorsements of another supplier. They show why an output label or family brochure is not enough for a technical comparison.
| Evidence area | Ask the supplier to state | Why it affects your decision |
|---|---|---|
| Physical reference | Target or process material, dimensions, surface, approach direction, mounting, start point and end point. | The same nominal range can behave differently with a different target or geometry. |
| Electrical reference | Supply, output range, load or burden, cable, wiring, ripple, output limits and fault behavior. | The receiver may see a clipped, shifted or noisy value even when the sensor is functioning. |
| Performance reference | Linearity, repeatability, hysteresis, temperature effect, resolution, response, settling and typical or maximum status. | It prevents unrelated error terms from being compared as if they were one accuracy value. |
| Configuration reference | Teach points, damping, range inversion, analog mode, IO-Link parameters, firmware and device-file revision. | A report is useful only when its parameter set matches the delivered unit. |
Know the limit of the claim
What can the standard claim prove, and what remains your responsibility?
Use IEC 60947-5-7 as one layer of product evidence. Keep machine fit, market approvals, safety and measurement acceptance in their own review paths.
| A properly scoped claim may support | The claim does not automatically prove |
|---|---|
| A common product vocabulary for analog-output proximity devices. | Accuracy with your target, bracket, temperature and production tolerance. |
| Declared analog characteristics, performance definitions and test conditions. | Compatibility with a particular PLC input, barrier, isolator or cable route. |
| A clearer comparison when models use the same edition and definitions. | Functional-safety suitability or defined behavior under every fault condition. |
| Review of influence quantities, output limits and model information. | Hazardous-area, food-contact, cybersecurity, market-legal or customer-specific approval. |
| Additional requirements for a built-in IEC 61131-9 interface where applicable. | Calibration traceability, machine risk acceptance or end-to-end system performance. |
Application validation
How should you validate an analog proximity sensor on the machine?
Set the reference before connecting the sensor
Validation should reproduce the conditions that can change the value seen by the controller. A strong acceptance test separates sensing error from output, wiring and PLC conversion error.
- 1Freeze the identity
Record the full model and suffix, serial or lot, firmware, device file, configuration and claimed standard edition.
- 2Define the reference
Use a justified target, fixture or process simulator. Record material, dimensions, position, approach direction and uncertainty.
Run the machine-side test
- 3Check the complete range
Measure lower, upper and decision-critical middle points. Test both directions when hysteresis matters.
- 4Apply the real load
Use the planned supply, cable, input card, barrier, isolator and worst justified loop burden or impedance.
- 5Check dynamic behavior
Measure warm-up, response, settling, filtering and PLC update at the target speed and dwell time.
- 6Apply operating influences
Test or justify temperature, target variation, vibration, contamination, EMC and supply conditions.
- 7Compare sensor and controller readings
Record the sensor-terminal output and the engineering value used by the PLC. Confirm scaling, units and alarm logic.
- 8Set the reapproval trigger
Keep raw data and define review triggers for electronics, firmware, settings, sensing face, cable, PLC card or process changes.
RFQ and acceptance
What should an RFQ and acceptance test include?
Define the acceptance boundary before comparing price
Replace a short request such as "IEC sensor, 4-20 mA" with a requirement that engineering, purchasing, quality and the supplier can test against.
| Requirement | Information to include in the RFQ or approval record |
|---|---|
| Product classification | Exact function, sensing principle, measurand, full model or suffix, intended use, claimed edition and applicable national adoption. |
| Sensing application | Target or process material, size, surface, range, speed, angle, mounting, environment and nearby material. |
| Analog output | 0-10 V, 4-20 mA or another range; start and end mapping; direction; load; ripple; limits; wiring and fault behavior. |
| Digital data | Value mapping, units, bit length, update time, status, diagnostics, device file, firmware and parameter control where relevant. |
| Performance envelope | Linearity, repeatability, hysteresis, resolution, drift, target effects, warm-up, response and typical versus maximum values. |
| Conformance evidence | Exact edition, model coverage, declaration or report, conditions, deviations, document revision and responsible supplier contact. |
| Acceptance method | Reference, test points, directions, repetitions, load, cable, PLC card, temperature, pass/fail rule and retained data. |
| Change control | Notification and reapproval for electronics, output stage, firmware, settings, sensing face, cable, materials or test-method changes. |
Keep the supplier evidence attached to the order
Evidence becomes stronger in stages: a family-level statement is useful for discovery; exact-model documentation supports comparison; configuration-specific test evidence supports approval; and a final-target test of the installed signal chain supports application acceptance.
Continue the review
Which xsz sensor resources can answer the next question?
Choose the resource that matches the remaining uncertainty in your selection, wiring or commissioning decision.
- Analog Proximity Sensors - review the xsz sensor product family for analog distance and position sensing.
- 0-10 V vs 4-20 mA analog proximity sensor output - compare the transmission choices across the complete machine route.
- PLC Sensor Inputs Explained - separate the sensor output from the receiving input behavior.
- What Is Sensor Repeatability and How Is It Measured? - define a performance term before comparing data sheets.
- Sensor Response Time - connect sensor timing with target dwell and PLC decisions.
- EMC in Industrial Sensors - plan wiring, grounding and validation in electrically noisy machines.
Buyer questions
What questions do buyers commonly ask about IEC 60947-5-7?
What is IEC 60947-5-7?
IEC 60947-5-7:2024 is the IEC product standard for proximity devices with analog output that correspond to the sensing scope of IEC 60947-5-2:2019. It covers analog-output requirements, characteristics, performance and verification, and can also address a corresponding digital value representing the detected sensing input.
What does PDAO mean?
PDAO means proximity device with analog output. It senses a defined physical input and reports it as a proportional analog signal under stated conditions. It may also provide a corresponding digital value or additional parameters.
Does the standard cover 4-20 mA and 0-10 V sensors?
It can cover an in-scope proximity device with either output range. The output range alone does not prove scope or conformance. Confirm the sensing function, exact model, edition, mapping, load, configuration, conditions and evidence.
Is IEC 60947-5-7 the same as IEC 60947-5-2?
No. IEC 60947-5-2 provides the underlying proximity-switch scope. IEC 60947-5-7 addresses devices corresponding to that scope when they provide analog output or a corresponding digital value and adds the analog-output framework.
Does an IO-Link label prove IEC 60947-5-7 conformance?
No. IEC 61131-9 defines the SDCI communication interface commonly known as IO-Link. An IO-Link label alone does not establish PDAO classification or 5-7 conformance. Request the exact product claim and configuration evidence.
Does IEC 60947-5-7 guarantee application accuracy?
No. Application accuracy depends on the exact model, target, configuration, temperature, supply, load, mounting, cable, controller conversion, timing and included error terms. Validate the complete installed chain at the operating points that matter.
Is this the right standard for pressure or temperature transmitters?
Not automatically. IEC 62828-1:2026 covers industrial and process measurement transmitters and expressly excludes sensing devices under the IEC 60947 series. Classify the product from its function and intended use, not only from its 4-20 mA or 0-10 V interface.
What documents should a buyer request?
Request the exact standard edition, full model and suffix, output and configuration coverage, data sheet, installation instructions, analog mapping and limits, performance definitions and conditions, declaration or test evidence, firmware and device-file revision where relevant, traceability and an agreed acceptance test.
Technical references
Which technical sources support this explanation?
- IEC 60947-5-7:2024 official product record - scope, current edition, publication date and listed technical changes.
- IEC 60947-5-2:2019 official product record - underlying proximity-switch sensing scope.
- IEC 61131-9:2022 official product record - SDCI / IO-Link communication interface for small sensors and actuators.
- IEC 62828-1:2026 official product record - process measurement transmitter framework and IEC 60947 exclusion.
- IEC 60947-5-3:2026 official product record - proximity devices with defined behavior under fault conditions.
- NIST Technical Note 1297 - measurement uncertainty guidance used to keep accuracy and uncertainty claims distinct.
Scope of this article: this page summarizes official public records and manufacturer documentation. It does not reproduce or replace the controlled standards text, national adoption, product instructions, contract requirements or qualified compliance advice.
xsz sensor application review
What should you send before selecting an analog proximity sensor?
Send the real target and signal-chain details so the proposed model can be reviewed against the application, not just against an output label.
- Sensed quantity and required range
- Target material, size and approach
- 0-10 V, 4-20 mA or digital value
- PLC input card and scaling
- Supply, cable length and loop devices
- Temperature, speed and tolerance
- Required standard edition and evidence
- Acceptance points and pass/fail criteria
