{"id":13638,"date":"2026-11-02T14:46:56","date_gmt":"2026-11-02T13:46:56","guid":{"rendered":"https:\/\/guemisa.es\/?p=13638"},"modified":"2026-11-03T11:10:16","modified_gmt":"2026-11-03T10:10:16","slug":"connect-linear-potentiometer-plc","status":"publish","type":"post","link":"https:\/\/guemisa.es\/en\/conectar-potenciometro-lineal-plc\/","title":{"rendered":"How to connect a linear potentiometer to a PLC: ratiometric vs. 4-20 mA"},"content":{"rendered":"<div class=\"gm-guia\"><p class=\"gm-g-kicker\">Technical guide \u00b7 GUEMISA<\/p><div class=\"gm-g-resp\"><span>Quick response<\/span><p>A linear potentiometer is a voltage divider: it is supplied with a stable voltage, for example 10 V, and the wiper delivers a fraction of that voltage proportional to its position. It can be connected directly to a 0\u201310 V analog input of the PLC, provided the input has very high impedance, because potentiometer transducer connectors recommend a wiper current of 1 \u00b5A maximum. If the cable is long, the environment is noisy, or the PLC only provides 4\u201320 mA, a signal conditioner (MUW, MUK, or MUP) is inserted to supply power to the potentiometer and deliver the standardized signal.<\/p><\/div><figure class=\"gm-anim\" data-anim=\"divisor\"><figcaption class=\"gm-anim-pie\">Change the PLC input impedance: with a low impedance input the cursor load error increases; with a 10 M\u03a9 conditioner it disappears.<\/figcaption><\/figure><nav class=\"gm-g-indice\"><b>In this guide<\/b><ol><li><a href=\"#el-potenciometro-como-divisor-de-tension\">The potentiometer as a voltage divider<\/a><\/li><li><a href=\"#conexion-directa-a-una-entrada-de-0-10-v\">Direct connection to a 0\u202610 V input<\/a><\/li><li><a href=\"#salida-ratiometrica-cuando-importa\">Ratiometric output: when it matters<\/a><\/li><li><a href=\"#cuando-poner-un-acondicionador-para-4-20-ma\">When to use a conditioner for 4\u202620 mA<\/a><\/li><li><a href=\"#tabla-comparativa-de-las-tres-soluciones\">Comparative table of the three solutions<\/a><\/li><li><a href=\"#que-acondicionador-elegir\">Which conditioner to choose<\/a><\/li><li><a href=\"#apantallado-y-masa\">Shielded and mass<\/a><\/li><li><a href=\"#que-productos-de-guemisa-encajan\">Which GUEMISA products are a good fit?<\/a><\/li><li><a href=\"#preguntas-frecuentes\">Frequently Asked Questions<\/a><\/li><\/ol><\/nav><h2 id=\"el-potenciometro-como-divisor-de-tension\">The potentiometer as a voltage divider<\/h2>\n<p>A linear potentiometric transducer has three connections: the two ends of the track and the wiper. The voltage Ub is applied between the ends; the wiper, which moves with the stem, outputs a voltage Us between 0 and Ub. The ratio Us\/Ub represents the relative position along the track. With 10 V and 40% of the track traveled, the wiper outputs 4 V.<\/p>\n<p>This signal is ratiometric in nature: it depends on the ratio between Us and Ub, not on the absolute resistance value (LWH: tolerance \u00b120%, and temperature coefficient of the output\/applied voltage ratio of typ. 5 ppm\/K). The nominal resistance matters little for accuracy and much for current draw and cursor load.<\/p>\n\n<h2 id=\"conexion-directa-a-una-entrada-de-0-10-v\">Direct connection to a 0\u202610 V input<\/h2>\n<p>A stable 10V power supply feeds the trace, the cursor goes to the analog input, and the power supply ground is connected to the input reference. Three points need to be taken care of.<\/p>\n<ul>\n<li>Stable power supply. The signal is proportional to Ub. Supplying the track with 24 V would result in up to 24 V at the cursor, exceeding the input range, and any fluctuations in the power supply would be passed on to the reading. A stable 10 V reference is required, or a power supply whose value is also measurable (see \u00abRatiometric Output\u00bb). The connectors set the maximum Ub to 42 VDC.<\/li>\n<li>Cursor current. LWH, TLH, T\/TS, LWG and TEX indicate a recommended cursor current of \u2264 1 \u00b5A (in TEX, &lt; 1 \u00b5A) and a maximum current of 10 mA in case of failure. The cursor should go to an input that draws almost no current.<\/li>\n<li>Input impedance. With 10 V at the cursor, a current of 1 \u00b5A corresponds to a load resistance of 10 M\u03a9. Many 0\u201310 V modules have lower impedances: check the datasheet.<\/li>\n<\/ul>\n\n<h3>How much error does the cursor loading introduce?<\/h3>\n<p>An input with resistor Rin forms a divider with the portion of the track between the cursor and ground. The maximum error, at mid-travel, is approximately 0.25 \u00d7 R \/ Rin, where R is the total resistance of the track. With a 5 k\u03a9 potentiometer:<\/p>\n<div class=\"gm-g-tabla\"><table>\n<thead><tr><th>Input impedance<\/th><th>Current in the cursor at 10 V<\/th><th>Mid-race error<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>100 k\u03a9<\/td><td>100 \u00b5A<\/td><td>Approx. 1.25% of the range<\/td><\/tr>\n<tr><td>1 M\u03a9<\/td><td>10 \u00b5A<\/td><td>Approx. 0.125% of the range<\/td><\/tr>\n<tr><td>10 M\u03a9<\/td><td>1 \u00b5A<\/td><td>Approx. 0.0125% of the range<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>The LWH-0300 (300 mm, 5 k\u03a9) has an independent linearity of \u00b10.06%: a 100 k\u03a9 input would add an error twenty times greater, and with 10 M\u03a9 the load error remains below linearity. These are indicative calculations.<\/p>\n\n<h2 id=\"salida-ratiometrica-cuando-importa\">Ratiometric output: when it matters<\/h2>\n<p>\u00abRatiometric\u00bb means that the output is a fraction of the supply voltage and varies with it. This is an advantage if the analog-to-digital converter uses that same voltage as a reference, because the variations cancel each other out in the reading; and a disadvantage if the measurement is taken with a fixed reference and the supply voltage fluctuates.<\/p>\n<ul>\n<li>The IPX-7900 rotary potentiometer declares a ratiometric output at Ub (Ub max. 42 V). The TFD-4000 Hall sensor gives 0.25\u20134.75 V with 5 VDC, also ratiometric: the power supply must be stable.<\/li>\n<\/ul>\n\n<h2 id=\"cuando-poner-un-acondicionador-para-4-20-ma\">When to use a conditioner for 4\u202620 mA<\/h2>\n<p>The conditioner supplies the potentiometer with a very stable internal reference voltage (10 VDC in the MUP-080, MUP-100\/150, MUP-110\/160, and MUK-350) and takes the cursor signal with a high-resistance input stage (&gt;10 M\u03a9 in the MUP-100\/150, MUP-110\/160, MUK-350, and MUW), keeping the cursor current within 1 \u00b5A. The MUP-410 supplies the potentiometer with 2.5 VDC \/ 5 mA. It then generates a standardized output. Recommended for use when:<\/p>\n<ul>\n<li>The PLC only has current inputs or its voltage input is not high impedance.<\/li>\n<li>The cable is long or passes close to drives and motors: the current suffers less from induced noise and voltage drop.<\/li>\n<li>Cable break detection is required: in the 4\u202620 mA range, zero is at 4 mA, so 0 mA indicates a fault. The MUP-410 outputs approximately 3.2 mA if the sensor wire breaks.<\/li>\n<li>Galvanic isolation is required (MUP-150, MUP-160, MUP-410).<\/li>\n<\/ul>\n<p>The maximum load of the current output is 500 \u03a9 in MUP-080, MUP-100\/150, MUP-110\/160 and MUW (&lt; 500 \u03a9 \/ 12 V on MUP-410): PLC input and wiring must not exceed it.<\/p>\n\n<h2 id=\"tabla-comparativa-de-las-tres-soluciones\">Comparative table of the three solutions<\/h2>\n<div class=\"gm-g-tabla\"><table>\n<thead><tr><th>Feature<\/th><th>Direct to 0\u202610 V<\/th><th>With conditioner at 0\u202610 V<\/th><th>With conditioner at 4\u202620 mA<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Signal on the cable<\/td><td>Cursor tension<\/td><td>Standardized voltage<\/td><td>standardized current<\/td><\/tr>\n<tr><td>Sensor power supply<\/td><td>Stable external source<\/td><td>The conditioner gives it to you.<\/td><td>The conditioner gives it to you.<\/td><\/tr>\n<tr><td>Load on cursor<\/td><td>It depends on the PLC input (\u2264 1 \u00b5A recommended)<\/td><td>No load (input &gt; 10 M\u03a9)<\/td><td>No load (input &gt; 10 M\u03a9)<\/td><\/tr>\n<tr><td>Sensitivity to noise and long cable<\/td><td>High<\/td><td>Average<\/td><td>Low<\/td><\/tr>\n<tr><td>Thread breakage detection<\/td><td>No<\/td><td>No<\/td><td>Yes (0 mA or below 4 mA)<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n\n<h2 id=\"que-acondicionador-elegir\">Which conditioner to choose<\/h2>\n<div class=\"gm-g-tabla\"><table>\n<thead><tr><th>Model<\/th><th>Assembly and protection<\/th><th>Departures<\/th><th>Galvanic isolation<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>MUP-080<\/td><td>DIN rail, IP20<\/td><td>0\u202610 V or 4\u202620 mA (depending on the reference)<\/td><td>No<\/td><\/tr>\n<tr><td>MUP-100 \/ 150<\/td><td>DIN rail, IP50 (IP00 terminals)<\/td><td>0\u202610 V, \u00b110 V, 0\/4\u202620 mA, \u00b120 mA<\/td><td>MUP-150<\/td><\/tr>\n<tr><td>MUP-110 \/ 160<\/td><td>DIN rail, IP50 (IP00 terminals)<\/td><td>0\u202610 V, 0\u202620 mA or 4\u202620 mA<\/td><td>MUP-160<\/td><\/tr>\n<tr><td>MUP-410<\/td><td>DIN rail, IP20<\/td><td>4\u202620 mA (default), 0\u202620 mA and others; 0\u202610 V, \u00b110 V and others<\/td><td>Yeah<\/td><\/tr>\n<tr><td>MUK-350<\/td><td>Aluminum enclosure, IP66<\/td><td>0\u202610 V, \u00b110 V, 0\u202620 mA or 4\u202620 mA<\/td><td>Not indicated in the data sheet<\/td><\/tr>\n<tr><td>MUW-200 \/ 250<\/td><td>DIN 43650 connector box, IP65; LWH and TLH only<\/td><td>0\u202610 V, 0\u202620 mA or 4\u202620 mA<\/td><td>Not indicated in the data sheet<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>The MUW goes in the LWH or TLH connector itself; the MUK-350 solves the same problem in the field for any potentiometer; the MUPs go in the panel.<\/p>\n\n<h2 id=\"apantallado-y-masa\">Shielded and mass<\/h2>\n<ul>\n<li>Shielded and braided cable. In-box conditioners recommend 3 braided wires with mesh (MUK-350: 0.25 mm\u00b2, \u00d8 4.5\u20266.5 mm; MUW: 3 or 4 wires, \u00d8 4\u202610 mm). The MUK-350 fitting has an EMC-compliant shielded contact.<\/li>\n<li>LWH: Protective grounding shield on the customer side; on the sensor, terminated near the housing without being connected to it or to the connector contacts. Pin 4 only carries the shield if the sensor is mounted in isolation, and never acts as a protective conductor (DIN EN 61010).<\/li>\n<li>TLH and T\/TS: The cable screen is grounded; the TLH has pin 4 for it.<\/li>\n<li>The sensor power supply ground and the analog input ground must be the same reference; a second ground path through the chassis adds noise.<\/li>\n<\/ul>\n\n<h2 id=\"que-productos-de-guemisa-encajan\">Which GUEMISA products are a good fit?<\/h2>\n<div class=\"gm-g-cards\"><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/potentiometric-linear-transducer-lwh\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-transductor-posicion-lwh-768x188.png\" alt=\"LWH\" loading=\"lazy\"><\/span><b>LWH<\/b><span class=\"gm-g-datos\">Stem potentiometer, stroke 50\u2026900 mm, IP55 with connector, resistance 2\u202610 k\u03a9, cursor \u2264 1 \u00b5A.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/potentiometric-transducer-without-tlh-stem\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-transductor-posicion-tlh-768x576.webp\" alt=\"TLH\" loading=\"lazy\"><\/span><b>TLH<\/b><span class=\"gm-g-datos\">Stemless potentiometer, stroke 100\u20263000 mm, IP40 \/ IP54, cursor \u2264 1 \u00b5A.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/muw-200-250-signal-conditioner\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-acondicionador-senal-muw-200-250-300x225.webp\" alt=\"MUW-200 \/ 250\" loading=\"lazy\"><\/span><b>MUW-200 \/ 250<\/b><span class=\"gm-g-datos\">Conditioner for LWH and TLH in the connector box, output 0\u202610 V, 0\u202620 mA or 4\u202620 mA, IP65.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/muk-350-signal-conditioner\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-acondicionador-senal-muk-350-300x225.webp\" alt=\"MUK-350\" loading=\"lazy\"><\/span><b>MUK-350<\/b><span class=\"gm-g-datos\">field conditioner, output 0\u202610 V, \u00b110 V, 0\u202620 mA or 4\u202620 mA, IP66.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/mup-410-signal-conditioner\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-acondicionador-senal-mup-410-300x225.webp\" alt=\"MUP-410\" loading=\"lazy\"><\/span><b>MUP-410<\/b><span class=\"gm-g-datos\">DIN rail conditioner with teach-in, galvanic isolation and default 4\u202620 mA output.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/signal-conditioner-mup-080\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-acondicionador-senal-mup-080-300x225.webp\" alt=\"MUP-080\" loading=\"lazy\"><\/span><b>MUP-080<\/b><span class=\"gm-g-datos\"><a href=\"https:\/\/guemisa.es\/en\/products\/mup-100-150-signal-conditioner\/\">MUP-100 \/ 150<\/a> and <a href=\"https:\/\/guemisa.es\/en\/products\/mup-110-160-signal-conditioner\/\">MUP-110 \/ 160<\/a>: DIN rail, output 0\u202610 V or 4\u202620 mA; adjustable in the latter two and with insulation in MUP-150 and MUP-160.<\/span><em>View technical specifications \u2192<\/em><\/a><a class=\"gm-g-card\" href=\"https:\/\/guemisa.es\/en\/products\/potentiometric-transducer-t-ts\/\"><span class=\"gm-g-foto\"><img decoding=\"async\" src=\"https:\/\/guemisa.es\/wp-content\/uploads\/2026\/10\/novotechnik-transductor-posicion-potenciometrico-t-ts-768x576.webp\" alt=\"T\/TS\" loading=\"lazy\"><\/span><b>T\/TS<\/b><span class=\"gm-g-datos\"><a href=\"https:\/\/guemisa.es\/en\/products\/potentiometric-transducer-with-tex-stem\/\">TEX<\/a> and <a href=\"https:\/\/guemisa.es\/en\/products\/lwg-stem-potentiometric-transducer\/\">LWG<\/a>: potentiometrics with 25\u2026150 mm, 10\u2026300 mm and 50\u2026750 mm stroke, with cursor \u2264 1 \u00b5A.<\/span><em>View technical specifications \u2192<\/em><\/a><\/div>\n<p>More options in the category <a href=\"https:\/\/guemisa.es\/en\/category\/linear-potentiometer\/\">linear potentiometer<\/a>.<\/p>\n\n<h2 id=\"documentacion-relacionada\">Documentation and related cases<\/h2><ul class=\"gm-g-rel\"><li><a href=\"https:\/\/guemisa.es\/en\/pdf-documents\/technical-definitions-of-potentiometers\/\">Potentiometers: Technical Definitions by Novotechnik (PDF, English)<\/a><\/li><li><a href=\"https:\/\/guemisa.es\/en\/pdf-documents\/sensors-with-io-link-protocol\/\">Novotechnik sensors with IO-Link interface (PDF, English)<\/a><\/li><li><a href=\"https:\/\/guemisa.es\/en\/technical-information\/\">All technical information about GUEMISA<\/a><\/li><\/ul><h2 id=\"preguntas-frecuentes\">Frequently Asked Questions<\/h2>\n<details class=\"gm-g-faq\"><summary>Can I connect a linear potentiometer directly to the PLC?<\/summary><p>Yes, if the PLC has a high-impedance 0-10V input and the trace is powered with a stable 10V voltage. If the input loads the cursor above 1\u00b5A, the reading loses accuracy and a voltage conditioner is preferable.<\/p>\n<\/details><details class=\"gm-g-faq\"><summary>What cursor current can a potentiometric transducer handle?<\/summary><p>The LWH, TLH, T\/TS, LWG and TEX datasheets recommend a maximum of 1 \u00b5A and give 10 mA as the maximum current in case of failure.<\/p>\n<\/details><details class=\"gm-g-faq\"><summary>When is 4\u202620 mA preferable to 0\u202610 V?<\/summary><p>With long cables, electrical noise, or the need to detect cable breakage, because 0 mA indicates a fault.<\/p>\n<\/details><details class=\"gm-g-faq\"><summary>Which conditioner goes with LWH or TLH?<\/summary><p>The MUW-200 or MUW-250 mounts in the DIN 43650 connector box next to the sensor. The 200 series has fixed range and zero; the 250 series has adjustable range and zero.<\/p><\/details>\n\n<div class=\"gm-g-cta\"><b>Do you need help choosing?<\/b><p>Send us the application, race or reference you have and we will tell you the model and your order code.<\/p><p><a class=\"gm-g-btn\" href=\"mailto:ventas@guemisa.com?subject=Consulta%3A%20C%C3%B3mo%20conectar%20un%20potenci%C3%B3metro%20lineal%20a%20un%20PLC%3A%20ratiom%C3%A9trico%20frente%20a%204-20%20mA\">Write to ventas@guemisa.com<\/a> <a class=\"gm-g-btn gm-g-btn2\" href=\"tel:+34917642100\">91 764 21 00<\/a><\/p><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Connecting a linear potentiometer to a PLC: direct to 0-10 V (ratiometric), cursor current \u2264 1 \u00b5A and when to use a 4-20 mA conditioner.<\/p>","protected":false},"author":1,"featured_media":13788,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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