{"id":36538,"date":"2025-07-14T09:22:31","date_gmt":"2025-07-14T14:22:31","guid":{"rendered":"https:\/\/www.dmcinfo.com\/?p=36538"},"modified":"2025-12-23T09:45:20","modified_gmt":"2025-12-23T14:45:20","slug":"controller-fault-handling-in-rockwell-plcs","status":"publish","type":"post","link":"https:\/\/www.dmcinfo.com\/blog\/36538\/controller-fault-handling-in-rockwell-plcs\/","title":{"rendered":"Controller Fault Handling in Rockwell PLCs"},"content":{"rendered":"\n<p>In industrial automation, even minor interruptions can result in substantial losses in productivity and revenue. To minimize downtime and enhance system reliability, Rockwell PLCs support a configurable fault handler program that enables the system to respond to faults in a controlled and effective manner. This article explores what controller faults are, why fault handling can be useful, and how to implement a fault handler in your Rockwell PLC program.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-understanding-controller-faults\">Understanding Controller Faults<\/h2>\n\n\n\n<p>A fault disrupts normal PLC execution and can stem from logic errors, data issues, or hardware problems. Rockwell controllers classify faults as either minor or major. Minor faults are logged but do not stop the program. Major faults, however, halt execution and must be cleared or acknowledged.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-fault-type-comparison\">Fault Type Comparison<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Minor Fault<\/th><th>Major Fault<\/th><\/tr><\/thead><tbody><tr><td>Program Execution<\/td><td>Continues<\/td><td>Halts until fault is cleared or acknowledged<\/td><\/tr><tr><td>Severity<\/td><td>Low<\/td><td>High<\/td><\/tr><tr><td>Example Causes<\/td><td>Overflow, underflow warnings<\/td><td>Invalid index, Negative timer preset<\/td><\/tr><tr><td>Recovery<\/td><td>Yes<\/td><td>Intervention required<\/td><\/tr><tr><td>Visibility<\/td><td>Logged in controller<\/td><td>Data removed after clearing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>By proactively handling recoverable major faults, users can reduce the impact of these interruptions. More importantly, controller fault data can be logged for the future and displayed on the HMI, so operators can see exactly what happened.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-creating-the-fault-handler-in-studio-5000\">Creating the Fault Handler in Studio 5000<\/h2>\n\n\n\n<p>Setting up a fault handler in Rockwell\u2019s Studio 5000 environment is a relatively simple process, but it\u2019s important to follow the correct structure and understand what happens under the hood. The controller fault handler allows fault conditions to be handled programmatically, and in some cases, recovered from without halting the entire system.<\/p>\n\n\n\n<p>Note: You cannot add a fault handler routine to a program while online. The project must be offline, and the program must be downloaded to the PLC for the fault handler to take effect.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-1-create-a-controller-fault-handler-program\">Step 1: Create a Controller Fault Handler Program<\/h3>\n\n\n\n<p>Open your project in Studio 5000 Logix Designer. In the <strong>Controller Organizer<\/strong>, right-click the <strong>Controller Fault Handler<\/strong> folder and select <strong>New Program<\/strong>. Name the program according to your project standards (e.g., ControllerFaults) and ensure the <strong>Schedule In<\/strong> option is set to \u201cController Fault Handler<strong>\u201d<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"779\" height=\"546\" src=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120234\/controller-organizer.png\" alt=\"controller organizer\" class=\"wp-image-36540\" srcset=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120234\/controller-organizer.png 779w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120234\/controller-organizer-300x210.png 300w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120234\/controller-organizer-768x538.png 768w\" sizes=\"(max-width: 779px) 100vw, 779px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-2-add-a-routine-to-the-fault-handler-program\">Step 2: Add a Routine to the Fault Handler Program<\/h3>\n\n\n\n<p>Once the program is created, right-click it and choose <strong>Add &gt; New Routine<\/strong>. Assign a descriptive name such as \u201cHandleMajorFaults\u201d.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"579\" height=\"465\" src=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120341\/controller-faults.png\" alt=\"controller faults\" class=\"wp-image-36541\" srcset=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120341\/controller-faults.png 579w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11120341\/controller-faults-300x241.png 300w\" sizes=\"(max-width: 579px) 100vw, 579px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-3-define-a-udt-to-store-fault-information\">Step 3: Define a UDT to Store Fault Information<\/h3>\n\n\n\n<p>To identify the fault and capture its data for logging or HMI display, create a user-defined data type (UDT). This structure should match Rockwell&#8217;s recommendation for storing a program\u2019s MajorFaultRecord.<\/p>\n\n\n\n<p>In the <strong>Controller Organizer<\/strong>, right-click <strong>Data Types &gt; User-Defined<\/strong> and create a UDT (e.g., FAULTRECORD). The structure should include the following attributes:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Data Type: FAULTRECORD<\/th><\/tr><\/thead><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Name <\/td><td>FAULTRECORD<\/td><\/tr><tr><td>Description<\/td><td>Stores the MajorFaultRecord attribute or MinorFaultRecord attribute of the Program object<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Members<\/th><\/tr><\/thead><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Name<\/th><th>Data Type<\/th><th>Style<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Time_Low<\/td><td>DINT<\/td><td>Decimal<\/td><td>Lower 32 bits of the fault timestamp value<\/td><\/tr><tr><td>Time_High<\/td><td>DINT<\/td><td>Decimal<\/td><td>Upper 32 bits of the fault timestamp value<\/td><\/tr><tr><td>Type<\/td><td>INT<\/td><td>Decimal<\/td><td>Fault type (program, I\/O, and so forth)<\/td><\/tr><tr><td>Code<\/td><td>INT<\/td><td>Decimal<\/td><td>Unique code for the fault<\/td><\/tr><tr><td>Info<\/td><td>DINT[8]<\/td><td>Hex<\/td><td>Fault specific information<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"780\" height=\"390\" src=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11123602\/faultrecord.png\" alt=\"faultrecord\" class=\"wp-image-36548\" style=\"width:780px;height:auto\" srcset=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11123602\/faultrecord.png 780w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11123602\/faultrecord-300x150.png 300w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11123602\/faultrecord-768x384.png 768w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/figure>\n\n\n\n<p>Note: The <strong>Type<\/strong> and <strong>Code<\/strong> fields are used to identify the fault and determine the appropriate response.<\/p>\n\n\n\n<p>The <strong>Info<\/strong> attribute contains encoded data related to the fault, but its format is not human-readable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-4-write-the-fault-handling-logic\">Step 4: Write the Fault Handling Logic<\/h3>\n\n\n\n<p>In your routine, use the <strong>GSV (Set System Value)<\/strong> instruction to retrieve fault details from the MajorFaultRecord attribute. Store this data in a tag using the FAULTRECORD type.<\/p>\n\n\n\n<p>Then, add logic to evaluate the fault&#8217;s type and code.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"780\" height=\"382\" src=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11124149\/major-faultrecord.png\" alt=\"major fault record\" class=\"wp-image-36552\" srcset=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11124149\/major-faultrecord.png 780w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11124149\/major-faultrecord-300x147.png 300w, https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11124149\/major-faultrecord-768x376.png 768w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/figure>\n\n\n\n<p>If the fault is one that should be auto-recoverable (e.g., an invalid array index), use the <strong>SSV (Set System Value)<\/strong> instruction to clear it. A <strong>MOV<\/strong> instruction can be used to write the fault data to the HMI.<\/p>\n\n\n\n<p>The two <strong>EQU<\/strong> instructions compare the fault type and code to identify the fault condition. Each recoverable fault you wish to handle requires a separate rung that checks for that fault\u2019s unique type and code. Faults are categorized using numeric values; a complete list is available on the Rockwell Automation website <a href=\"https:\/\/support.rockwellautomation.com\/app\/answers\/answer_view\/a_id\/1088680\/~\/logix-5000-controllers%3A-major-and-minor-fault-code-list-\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a>.<\/p>\n\n\n\n<p>Note: When a controller faults, it provides the exact location of the fault. This location is not included if the fault is caught by the handler.<\/p>\n\n\n\n<p>Important: Only clear faults that are known and safe to recover from. Avoid clearing all faults indiscriminately, as this could hide critical system issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-5-testing-and-validation\">Step 5: Testing and Validation<\/h3>\n\n\n\n<p>To verify your fault handler, induce a fault manually and confirm that the system logs and processes it correctly. A common test involves assigning a negative value to a timer preset, which triggers a major fault when executed. Be sure to have a rung in the fault handling routine that is specifically looking for the timer preset fault code and type.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"184\" height=\"94\" src=\"https:\/\/cdn.dmcinfo.com\/wp-content\/uploads\/2025\/07\/11124508\/TON.png\" alt=\"TON testing and validation\" class=\"wp-image-36555\"\/><\/figure>\n\n\n\n<p>You can test other faults as well, but be cautious. Only test conditions that you have configured the fault handler to manage, as unhandled faults will stop the PLC and may interrupt production.<\/p>\n\n\n\n<p>Rockwell provides a tutorial on creating fault handlers, which includes additional examples and best practices, which can be found <a href=\"https:\/\/literature.rockwellautomation.com\/idc\/groups\/literature\/documents\/pm\/1756-pm014_-en-p.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-summary\">Summary<\/h2>\n\n\n\n<p>Implementing a controller fault handler in your Rockwell PLC program provides a structured way to manage recoverable runtime faults. It helps reduce unplanned downtime, preserves fault data for diagnostics, and supports smoother system recovery.<\/p>\n\n\n\n<p>If you\u2019re working through a fault-handling strategy or looking for ways to improve system resilience, contact us today to learn more about our solutions and how we can help you implement smarter, more resilient PLC programs that keep your production line running efficiently.<\/p>\n\n\n\n<p><strong>Ready to take your&nbsp;<a href=\"https:\/\/www.dmcinfo.com\/services\/manufacturing-automation-and-intelligence\/\">Automation<\/a>&nbsp;project to the next level?&nbsp;<a href=\"https:\/\/www.dmcinfo.com\/contact#get-in-touch\" target=\"_blank\" rel=\"noreferrer noopener\">Contact us today<\/a>&nbsp;to learn more about our solutions and how we can help you achieve your goals.&nbsp;<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In industrial automation, even minor interruptions can result in substantial losses in productivity and revenue. To minimize downtime and enhance system reliability, Rockwell PLCs support a configurable fault handler program that enables the system to respond to faults in a controlled and effective manner. This article explores what controller faults are, why fault handling can [&hellip;]<\/p>\n","protected":false},"author":125,"featured_media":36561,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[731,732],"tags":[],"class_list":["post-36538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manufacturing-automation-intelligence","category-plc"],"yoast_head":"<title>Controller Fault Handling in Rockwell PLCs | DMC, Inc.<\/title>\n<meta name=\"description\" content=\"Learn how to implement fault handlers in Rockwell PLCs to manage recoverable faults, minimize downtime, and improve system reliability.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dmcinfo.com\/blog\/36538\/controller-fault-handling-in-rockwell-plcs\/\" \/>\n<meta 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