{"id":7082,"date":"2021-05-24T13:43:20","date_gmt":"2021-05-24T11:43:20","guid":{"rendered":"https:\/\/www.servomotorsadjust.com\/cual-es-la-diferencia-entre-un-encoder-incremental-y-absoluto\/"},"modified":"2026-03-09T12:27:05","modified_gmt":"2026-03-09T11:27:05","slug":"what-is-the-difference-between-an-incremental-and-absolute-encoder","status":"publish","type":"post","link":"https:\/\/www.servomotorsadjust.com\/en\/what-is-the-difference-between-an-incremental-and-absolute-encoder\/","title":{"rendered":"What is the difference between an incremental and absolute encoder?"},"content":{"rendered":"<h2 style=\"font-size: 24px;\"><strong>Differences Between Absolute and Incremental Encoders<\/strong><\/h2>\n<h3 style=\"font-size: 22px;\"><strong>How Do Incremental and Absolute Encoders Work?<\/strong><\/h3>\n<h4 style=\"font-size: 20px;\"><strong>A- Incremental Encoder<\/strong><\/h4>\n<p><strong>Incremental encoders generate a specific number of pulses per inch or millimeter of linear movement.<\/strong><\/p>\n<p>An <strong>incremental encoder<\/strong> has two outputs, commonly called <strong>A<\/strong> and <strong>B<\/strong>, which produce two signals, theoretically square waves, 90 degrees out of phase when movement occurs. Industrial encoders often have a third output called <strong>index (Z)<\/strong>, which is used to indicate that one complete revolution has been made and to verify that the <strong>encoder is counting properly<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5139 size-full\" src=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2020\/05\/Captura-de-pantalla-2020-05-15-a-las-11.34.13.png\" alt=\"Incremental encoders vs absolute encoders\" width=\"485\" height=\"306\" srcset=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2020\/05\/Captura-de-pantalla-2020-05-15-a-las-11.34.13.png 485w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2020\/05\/Captura-de-pantalla-2020-05-15-a-las-11.34.13-300x189.png 300w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2020\/05\/Captura-de-pantalla-2020-05-15-a-las-11.34.13-81x51.png 81w\" sizes=\"auto, (max-width: 485px) 100vw, 485px\" \/><\/p>\n<p>This output allows us to monitor processes that may reverse direction or that must maintain a clear position when stopped or oscillating mechanically.<\/p>\n<p>The bidirectional square-wave output is recommended for most position, speed, and distance applications.<\/p>\n<p>An <strong>incremental encoder<\/strong> output only shows movement. To determine position, its pulses must be counted by a controller or counter. Pulse counting occurs continuously, while the Z signal provides one reference pulse per shaft revolution. Counting may be affected by a power outage or electrical noise. When the equipment starts, it must usually be moved to a reference or home position to re-establish the correct position count.<\/p>\n<div><a href=\"https:\/\/www.tamagawa-seiki.com\/products\/rotaryencoder\/incremental.html\" target=\"_blank\" rel=\"noopener\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6995\" title=\"tamagawa encoder\" src=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-scaled.jpeg\" alt=\"Incremental encoder example\" width=\"723\" height=\"542\" srcset=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-scaled.jpeg 2560w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-300x225.jpeg 300w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-1024x768.jpeg 1024w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-768x576.jpeg 768w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-1536x1152.jpeg 1536w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-2048x1536.jpeg 2048w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-1028x771.jpeg 1028w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-81x61.jpeg 81w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5544-600x450.jpeg 600w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><br \/>\n<\/a><\/div>\n<div><a href=\"https:\/\/encoder.co.uk\/core\/files\/encoder\/uploads\/files\/Industrial%20Encoders%20and%20Accessories%20Catalogue.pdf\" target=\"_blank\" rel=\"noopener\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6998\" title=\"Accu encoder\" src=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-scaled.jpeg\" alt=\"Industrial incremental encoder\" width=\"725\" height=\"544\" srcset=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-scaled.jpeg 2560w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-300x225.jpeg 300w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-1024x768.jpeg 1024w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-768x576.jpeg 768w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-1536x1152.jpeg 1536w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-2048x1536.jpeg 2048w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-1028x771.jpeg 1028w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-81x61.jpeg 81w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5545-600x450.jpeg 600w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><br \/>\n<\/a><\/div>\n<h5 style=\"font-size: 18px;\"><strong>Advantages of Incremental Encoders<\/strong><\/h5>\n<p><strong>Some of the advantages of using incremental encoders are the following:<\/strong><\/p>\n<ul>\n<li>They are inherently digital, so they can be easily connected to modern devices.<\/li>\n<li>They are inexpensive and easy to use.<\/li>\n<li>They can provide good resolution in relation to their cost.<\/li>\n<li>Their differential digital output makes them more immune to electrical noise than analog devices.<\/li>\n<\/ul>\n<h5 style=\"font-size: 18px;\"><strong>Disadvantages of Incremental Encoders<\/strong><\/h5>\n<p><strong>Some of the disadvantages of using incremental encoders are the following:<\/strong><\/p>\n<ul>\n<li>An incremental encoder without commutation signals provides speed and position feedback, but not commutation feedback.<\/li>\n<li>If the unit\u2019s power supply is interrupted, the position is lost.<\/li>\n<li>Compared with other feedback technologies, the working temperature range may be lower because the electronics are built into the encoder.<\/li>\n<\/ul>\n<h4 style=\"font-size: 20px;\"><strong>B- Absolute Encoder<\/strong><\/h4>\n<p><strong>An absolute encoder generates digital messages that indicate the encoder\u2019s current position, as well as its speed and direction of movement.<\/strong> If power is lost, the position information is recovered as soon as power is restored. Unlike an incremental encoder, it is not necessary to return to a reference position.<\/p>\n<p>An absolute encoder\u2019s resolution is defined by the number of bits in each output message. This output can be in binary code or Gray code, which changes only one bit at a time to minimize errors.<\/p>\n<p>It emits a unique digital code for each shaft angle.<\/p>\n<p>An absolute Gray code encoder may use multiple tracks. In this type of encoder, the housing contains the sensing system, the code disc, and the power supply connections.<\/p>\n<p>The resolution of a sin\/cos encoder depends on the frequency of the sinusoidal signal and the encoder\u2019s peak-to-peak differential voltage.<\/p>\n<p>Just like conventional rotary sin\/cos encoders, linear sin\/cos encoders are also available. The linear scale is fixed to the machine structure, while the sensor head is mounted on the moving unit.<\/p>\n<p><a href=\"https:\/\/www.sick.com\/es\/es\/encoders\/encoders-absolutos\/c\/g244395\" target=\"_blank\" rel=\"noopener\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6991\" src=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5237.jpg\" alt=\"Absolute encoder\" width=\"461\" height=\"345\" srcset=\"https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5237.jpg 640w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5237-300x225.jpg 300w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5237-81x61.jpg 81w, https:\/\/www.servomotorsadjust.com\/wp-content\/uploads\/2021\/05\/IMG_5237-600x450.jpg 600w\" sizes=\"auto, (max-width: 461px) 100vw, 461px\" \/><br \/>\n<\/a><\/p>\n<h5 style=\"font-size: 18px;\"><strong>Advantages of Absolute Encoders<\/strong><\/h5>\n<p><strong>Some advantages of absolute encoders are the following:<\/strong><\/p>\n<ul>\n<li>High resolution can be achieved with interpolation inside the unit.<\/li>\n<li>They can also provide incremental signals.<\/li>\n<li>They retain position information even after a power cycle.<\/li>\n<\/ul>\n<h5 style=\"font-size: 18px;\"><strong>Disadvantages of Absolute Encoders<\/strong><\/h5>\n<p><strong>Some disadvantages of absolute encoders are the following:<\/strong><\/p>\n<ul>\n<li>They are usually more expensive than incremental encoders.<\/li>\n<li>Installation and integration can be more complex depending on the interface.<\/li>\n<li>Sin\/cos feedback signals can be sensitive to electrical noise due to their analog nature.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Differences Between Absolute and Incremental Encoders How Do Incremental and Absolute Encoders Work? A- Incremental Encoder Incremental encoders generate a specific number of pulses per inch or millimeter of linear movement. An incremental encoder has two outputs, commonly called A and B, which produce two signals, theoretically square waves, 90 degrees out of phase when movement occurs. Industrial encoders often have a third output called index (Z), which is used to indicate that one complete revolution has been made and to verify that the encoder is counting properly. This output allows us to monitor processes that may reverse direction or that must maintain a clear position when stopped or oscillating mechanically. The bidirectional square-wave output is recommended for most position, speed, and distance applications. An incremental encoder output only shows movement. To determine position, its pulses must be counted by a controller or counter. Pulse counting occurs continuously, while the Z signal provides one reference pulse per shaft revolution. Counting may be affected by a power outage or electrical noise. When the equipment starts, it must usually be moved to a reference or home position to re-establish the correct position count. Advantages of Incremental Encoders Some of the advantages of&#8230;<\/p>\n","protected":false},"author":3,"featured_media":7005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[55],"tags":[61,62],"class_list":["post-7082","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-encoder-en","tag-servomotores-en","tag-servomotorqadjust-en","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.1 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Absolute encoder vs Incremental encoder | Encoder types<\/title>\n<meta name=\"description\" content=\"What is the difference between an incremental and absolute encoder? How do incremental and absolute encoders work? 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How do incremental and absolute encoders work? 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