{"id":3631,"date":"2019-03-25T17:45:13","date_gmt":"2019-03-25T20:45:13","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/disabling-tags-from-a-plc-that-has-failed\/"},"modified":"2019-06-10T14:33:18","modified_gmt":"2019-06-10T17:33:18","slug":"disabling-tags-from-a-plc-that-has-failed","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/","title":{"rendered":"Disabling tags from a PLC that has failed."},"content":{"rendered":"
\n

On a serial network, you can use a single driver to communicate with several devices; depending on the protocol being used, each tag’s N1 <\/i>parameter will be responsible for telling them apart.<\/p>\n

Whenever there is a communication failure with a certain device (which can be expected on a large network), the driver will continue trying to read this device’s tags; this can cause the responses to fail or be delayed, thus giving it the false appearance of system hanging.<\/p>\n

This article features a demo application which disables tag reading in a device when it has failed for a certain time. The application has one control tag per device; when the tag’s quality turns bad, a counter will start up to check its quality periodically. If the quality remains bad after a certain time, the tags in the device won’t be read anymore.<\/p>\n

The application retrieves three I\/O tags and a two-element block from different devices. The I\/O driver being used in the example is Modicon Modbus Master. To simulate the devices, you can use any Modbus simulator that enables simulating more than one device with different IDs.<\/p>\n

In this application, the driver was connected via ethernet (because of the simulator being used, which does not interfere with the proposed solution). We use MOD_RSSIM<\/b> simulator, which is attached to this article and can also be downloaded from this site<\/a>.<\/p>\n

This article also features a library called desabilitaleituraemerro<\/b>.lib which contains only one XObject, called xoDisable<\/b>. This object contains scripts for enabling and disabling tag reads. For each device to be controlled, a new instance of xoDisable <\/b>must be added to the data server (data folder).<\/p>\n

To each new instance added to the main project, fill out the following xoDisable<\/b>‘s properties:<\/p>\n

AppDriver<\/b><\/i>: driver to which the device belongs
\nDatabase<\/i><\/b>: database object where “read enabled” or “read disabled” messages are recorded
\nIDEquip<\/b><\/i>: the device’s ID on the network (N1 <\/i>parameter in the I\/O driver)
\nTable<\/b><\/i>:\u00a0 name of the table where read events are recorded
\nControlTag<\/b><\/i>: checks if communication has failed. This is the only tag whose read is not disabled when in fail
\nPresetValue<\/b><\/i>: time interval (in seconds) when communication is checked when in fail<\/p>\n

To enable the counter tag in the xoDisable<\/b>‘s instance where the device has failed (N1<\/i>), you must add a script to the driver’s OnCommError <\/i>event. Example:<\/p>\n

Sub Driver_OnCommError(EvtType, Size, Element, N1, N2, N3, N4)
\n‘Script that checks which N1 has failed and enables a counter.
\nif N1 = 1 then
\nApplication.GetObject(“Data.xoDriver1”).CounterTag.Enabled = true
\nelseif N1 = 2 then
\nApplication.GetObject(“Data.xoDriver2”).CounterTag.Enabled = true
\nend if
\nEnd Sub<\/span><\/div>\n

To use this application, follow these procedures:<\/p>\n

    \n
  1. Execute a Modbus simulator that simulates two PLCs at port 502, or the use two PLCs, whose network IDs are 1 and 2, and which contain Holding Register<\/b>-type variables with addresses ranging from 1 to 5.<\/li>\n
  2. Open the application in edition mode, set up the driver’s connection IP, and run the application.<\/li>\n
  3. At the Modbus simulator, disable only one (control) variable of one of the PLCs, or then completely disable one of the simulating PLCs.<\/li>\n
  4. Wait for Elipse E3’s timing and check whether the other tags’ reading has been disabled.<\/li>\n
  5. Enable again the variable or PLC previously disabled.<\/li>\n
  6. Reading will be reestablished after one good-quality variable is read.<\/li>\n<\/ol>\n

    The demo application was developed with Elipse E3 version 4.6 build 162.<\/p>\n

    Attachments:<\/h3>\n

    DisableReadOnError.zip<\/a><\/p>\n

    mod_RSsim_8_20 (1).zip<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    On a serial network, you can use a single driver to communicate with several devices; depending on the protocol being used, each tag’s N1 parameter will be responsible for telling…<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[753,763],"tags":[],"yoast_head":"\nDisabling tags from a PLC that has failed. - Elipse Knowledgebase<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Disabling tags from a PLC that has failed.\" \/>\n<meta property=\"og:description\" content=\"On a serial network, you can use a single driver to communicate with several devices; depending on the protocol being used, each tag’s N1 parameter will be responsible for telling…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\" \/>\n<meta property=\"og:site_name\" content=\"Elipse Knowledgebase\" \/>\n<meta property=\"article:publisher\" content=\"http:\/\/www.facebook.com\/elipsesoftware\" \/>\n<meta property=\"article:published_time\" content=\"2019-03-25T20:45:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-06-10T17:33:18+00:00\" \/>\n<meta name=\"author\" content=\"Enrico Busnello Amorim\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Enrico Busnello Amorim\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\"},\"author\":{\"name\":\"Enrico Busnello Amorim\",\"@id\":\"https:\/\/kb.elipse.com.br\/#\/schema\/person\/aa880bd098677c1ae91fa708e17cdc12\"},\"headline\":\"Disabling tags from a PLC that has failed.\",\"datePublished\":\"2019-03-25T20:45:13+00:00\",\"dateModified\":\"2019-06-10T17:33:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\"},\"wordCount\":574,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/kb.elipse.com.br\/#organization\"},\"articleSection\":[\"IODriver \/ IOServer\",\"Scripts\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\",\"url\":\"https:\/\/kb.elipse.com.br\/en\/disabling-tags-from-a-plc-that-has-failed\/\",\"name\":\"[:pt]Disabling tags from a PLC that has failed.[:] - 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