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WS21

Product catalog summary

Overview: The posiwire® WS21 is a cable extension position sensor designed for measuring displacements up to 20,000 mm. It features a robust aluminum/PBT housing and offers various output options including analog, digital SSI, and CAN Bus. The sensor includes a magnetic absolute encoder and is available in redundant versions.

Specifications: The WS21 sensor has a measurement range of 8000 to 20000 mm with a resolution of less than 0.002% full scale. It supports analog (voltage and current), digital SSI, and CAN Bus outputs. The sensor's linearity is ±0.10% full scale, with an optional ±0.05% full scale. It operates within a temperature range of -20 to +85 °C and complies with EMC standard DIN EN 61326-1:2013.

Protection and Material: Rated up to IP67/IP69 with a mating connector, the sensor is constructed from aluminum and PBT, with a stainless steel measuring cable.

Output Options:

Analog Output: Available in standard, programmable, and redundant versions with voltage outputs of 0.5-10 V or 0.5-4.5 V, and current output of 4-20 mA.
Digital Output: Includes SSI with a resolution of 50 or 100 µm and CAN Bus options supporting CANopen and CAN SAE J1939 protocols.

Mechanical and Environmental Specifications: The sensor can withstand shocks up to 100 g/11 ms and vibrations of 20 g from 10 Hz to 2 kHz. It weighs between 1.5 kg and 4.2 kg depending on the measurement range.

Order and Accessories: Detailed order codes for different configurations are provided, along with available accessories like connector cables.

Dimensions and Cable Forces: Dimensions for various models are included, specifying typical cable forces at 20 °C, with maximum pull-out and minimum pull-in forces for each measurement range.

Additional Specifications: The system has a default bus speed of 125 kBit and uses an M12 connector with 5 pins. It includes an integrated bus terminating resistor of 120Ω, adjustable by the customer, and is not galvanically isolated. The excitation voltage ranges from 8 to 36 V DC, with typical currents of 20 mA at 24 V DC and 40 mA at 12 V DC, with a maximum of 80 mA. The measuring rate is 1 kHz (asynchronous), with temperature stability of ±50 x 10^-6/°C full scale (typical) and repeatability of 1 LSB. The system is protected against reverse polarity and short circuits, with a dielectric strength of 1 kV (V AC, 50 Hz, 1 min.).

Signal Wiring: Uses an M12, 5-pin connector with specific pin assignments for output signals.

CAN Specification: Follows ISO 11898, supporting Basic and Full CAN 2.0 B. The transceiver is 24V-compliant and not isolated, with a communication profile adhering to SAE J1939 and a baud rate of 250 kbit/s.

Accessories: Various connector cables are available, including M12 connectors with 4, 5, and 8 pins, in angular and straight couplings, suitable for cable carriers with specific movement and bending specifications.

Order Codes: Provides order codes for different cable configurations, including IP69-rated options.

Catalog excerpts

posiwire® Cable Extension Position Sensors WS21 Displacement sensor with measurement length up to 20,000 mm High-performance aluminum/PBT housing With magnetic absolute encoder Optional with integrated inclination sensor (WST21) Redundant version available Product versions Analog output Analog output, programmable Analog output, redundant Digital output

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WS21 - Cable Extension Position Sensor Version with analog output Specifications Order options Measurement range Voltage 0.5 ... 10 V Voltage 0.5 ... 4.5 V Current 4 ... 20 mA, 3 wire Signal characteristics Increasing signal (e.g. 4 ... 20 mA) Decreasing signal (e.g. 20 ... 4 mA) Sensing device Magnetic absolute encoder Aluminum, PBT measuring cable: stainless steel Protection class IP67/IP69 (with mating connector only) Cable fixing M4 cable fixing Cable clip Temperature range Order example: WS21 – 15000 – U2 – A – L10 – M4 – M12R5 Accessories: Connector cable (see page 22)

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WS21 - Cable Extension Position Sensor Version with analog output, programmable Specifications Order options Measurement range Voltage 0.5 ... 10 V, programmable Voltage 0.5 ... 4.5 V, programmable Current 4 ... 20 mA, 3 wire, programmable Signal characteristics Increasing signal (e.g. 4 ... 20 mA) Decreasing signal (e.g. 20 ... 4 mA) Sensing device Magnetic absolute encoder Aluminum, PBT measuring cable: stainless steel Protection class IP67/IP69 (with mating connector only) Cable fixing M4 cable fixing Cable clip Temperature range Order example: WS21 – 15000 – U2/PMU – A – L10 – M4 – M12R5...

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WS21 - Cable Extension Position Sensor Version with analog output, redundant Specifications Order options Measurement range Voltage 0.5 ... 10 V, redundant Voltage 0.5 ... 4.5 V, redundant Current 4 ... 20 mA, 3 wire, redundant Signal characteristics Output 1 increasing, output 2 increasing Output 1 increasing, output 2 decreasing Output 1 decreasing, output 2 decreasing Sensing device Magnetic absolute encoder Aluminum, PBT measuring cable: stainless steel Protection class IP67/IP69 (with mating connector only) Cable fixing M4 cable fixing Cable clip Temperature range Order example: WS21 – 15000...

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WS21 - Cable Extension Position Sensor Version with digital output SSI Specifications Order options Measurement range SSI synchronous serial interface Sensing device Magnetic absolute encoder Aluminum, PBT measuring cable: stainless steel Protection class IP67/IP69 (with mating connector only) Cable fixing M4 cable fixing Cable clip Temperature range Order example: WS21 – 15000 – 50 – MSSI – L10 – M4 – M12R8 Accessories: Connector cable (see page 24)

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WS21 - Cable Extension Position Sensor Version with digital output CAN Bus Specifications Order options Measurement range CANopen CAN SAE J1939 CANopen redundant CAN SAE J1939 redundant Sensing device Magnetic absolute encoder Aluminum, PBT measuring cable: stainless steel Protection class IP67/IP69 (with mating connector only) Cable fixing M4 cable fixing Cable clip Temperature range Order example: WS21 – 15000 – MCANOP – L10 – M4 – M12/CAN Accessories: Connector cable (see page 25)

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Cable forces typical at = 20 °C Maximum pull-out force [N] Minimum pull-in force [N]

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A – Option SB0 B – Connector M12 Dimensions in mm [inch]. Weight approx. 1.5 kg. Dimensions informative only. For guaranteed dimensions consult factory.

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A - Option SB0 B – Connector M12 Dimensions in mm [inch]. Weight approx. 2.5 kg. Dimensions informative only. For guaranteed dimensions consult factory.

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posiwire® WS21 Measurement range 15000 mm, magnetic encoder output A – Option SB0 B – Connector M12 Dimensions in mm [inch]. Weight approx. 3.0 kg. Dimensions informative only. For guaranteed dimensions consult factory.

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posiwire® WS21 Measurement range 17500 … 20000 mm, magnetic encoder output A – Option SB0 B – Connector M12 Dimensions in mm [inch]. Weight approx. 4.2 kg. Dimensions informative only. For guaranteed dimensions consult factory.

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posiwire® WS21 Output specification Analog output Excitation voltage Excitation current Output voltage Output current Measuring rate Stability (temperature) Reverse polarity, short circuit Operating temperature See specification of the respective sensor Excitation voltage Excitation current Output voltage Output current Measuring rate Stability (temperature) Reverse polarity, short circuit Operating temperature See specification of the respective sensor Excitation voltage Current output Excitation current Output current Measuring rate Stability (temperature) Reverse polarity, short circuit Operating...

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Signal wiring Connector M12, 5 pin Output signals Cable color View to the sensor connector

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posiwire® WS21 Analog output, programmable Excitation voltage Excitation current Output voltage Output current Measuring rate Stability (temperature) Reverse polarity, short circuit Operating temperature See specification of the respective sensor Excitation voltage Excitation current Output voltage Output current Measuring rate Stabilität (Temperatur) Reverse polarity, short circuit Operating temperature See specification of the respective sensor Excitation voltage Excitation current Output current Measuring rate Stability (temperature) Reverse polarity, short circuit Operating temperature See...

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Signal wiring Connector M12, 5 pin Output signals Cable color View to the sensor connector Output …/PMU Programming of the start and end value by the customer (programmable) Teach-In of start and end value for the analog outputs U2/PMU, U8/PMU, I1/PMU is provided by a binary signal SPAN/ZERO. At the start position connect signal SPAN/ZERO for a period of 2 ... 3 seconds to GND via push button. At the end position connect signal SPAN/ZERO for a period of 5 ... 6 seconds to GND via a push button. The scaling range will be stored non-volatile. To reset the sensor to factory default ZERO/END must...

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