Logix 5000 Controllers Tasks, Programs, and Routines 1756 ...

1 Programming Manual Logix 5000 Controllers Tasks, Programs, and Routines 1756 ControlLogix, 1756 GuardLogix, 1769 CompactLogix, 1769 Compact GuardLogix, 1789 SoftLogix, 5069 CompactLogix, 5069 Compact GuardLogix, studio 5000 Logix Emulate Important user information Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.

2 Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc.

3 Cannot assume responsibility or liability for actual use based on the examples and diagrams. No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual. Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited. Throughout this manual, when necessary, we use notes to make you aware of safety considerations. WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

4 ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence Important: Identifies information that is critical for successful application and understanding of the product. Labels may also be on or inside the equipment to provide specific precautions. SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present. BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.

5 ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE). Allen-Bradley, Rockwell Software, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies. Summary of changes This manual contains new and updated information. There are a number of minor changes throughout this publication that were made to clarify existing information.

6 The major changes are listed in the following table. Change Topic Updated the list of supported Controllers . Cover Updated screen shots. Throughout Rockwell Automation Publication 1756-PM005H-EN-P - February 2018 3. Table of contents Preface studio 5000 environment .. 7. Additional resources .. 7. Legal notices .. 8. Chapter 1. Manage Tasks 11. Select Controller Tasks .. 11. Use Caution in the Number of Tasks That You Use .. 13. Prioritize Periodic and Event tasks .. 14. Additional Considerations .. 14. 15. Leave Enough Time for Unscheduled 16. Avoid Overlaps .. 17. Manually Check for Overlaps .. 18. Programmatically Check for Overlaps.

7 19. Configure Output Processing for a 21. Manually Configure Output Processing .. 23. Programmatically Configure Output 24. Inhibit a Task .. 25. Manually Inhibit or Uninhibit a Task .. 25. Programmatically Inhibit or Uninhibit a Task .. 27. Create a Task .. 28. Create a Periodic 29. Language Switching .. 30. Adjust the System-overhead Time Slice .. 31. Configure the System-overhead Time 32. Adjust the System Watchdog Time .. 34. Adjust the Watchdog Timer for a Task .. 34. Chapter 2. Manage Event Tasks 37. Choose the trigger for an event task .. 37. Module Input Data State Change Trigger .. 40. How an I/O Module Triggers an Event Task.

8 40. Make Sure Your Module Can Trigger an Event 43. Checklist for an Input Event Task .. 43. Example Input Event Task .. 45. Estimate Throughput .. 46. Example - Estimate Throughput .. 47. Additional Considerations .. 48. Motion Group Trigger .. 49. Checklist for a Motion Group 51. Axis Registration Trigger .. 51. Checklist for an Axis Registration 52. Example - Axis Registration Trigger .. 53. Rockwell Automation Publication 1756-PM005H-EN-P - February 2018 5. Table of contents Axis Watch Trigger .. 55. Checklist for an Axis Watch 56. Example - Axis Watch Trigger .. 57. Consumed Tag Trigger .. 59. Maintain the Integrity of Data.

9 61. Synchronize multiple Controllers .. 62. Checklist for the Producer Controller .. 62. Checklist for the Consumer Controller .. 63. Example - Producer Controller and Consumer Controller .. 64. Producer Controller .. 64. Produced Tag Properties .. 64. Ladder 65. Consumer Controller .. 65. Event Task Properties .. 65. Ladder Diagram in the Event Task .. 65. EVENT Instruction Trigger .. 66. Programmatically Determine if EVENT Instruction Triggered Task .. 67. Checklist for an EVENT Instruction Task .. 67. Example EVENT Instruction Trigger .. 68. Event Task Properties .. 68. Ladder Diagram in Program_A .. 68. Ladder Diagram in 68.

10 Define a Timeout Value for an Event Task .. 69. Assign a Timeout Value to an Event Task .. 70. Programmatically Configure a Timeout .. 71. Programmatically determine if a timeout occurs .. 71. Index 6 Rockwell Automation Publication 1756-PM005H-EN-P - February 2018. Preface This manual is one of a set of related manuals that show common procedures for programming and operating Logix 5000 Controllers . For a complete list of common procedures manuals, refer to the Logix 5000 . Controllers Common Procedures Programming Manual , publication 1756- PM001 . The term Logix 5000 controller refers to any controller that is based on the Logix 5000 operating system.