Allen Bradley1756-OB16SModule New In Stock

Introduction

A task can have as many as 32 separate programs, each with its own executable routines and program-scoped tags. Once a task is triggered (activated), all the programs assigned to the task execute in the order in which they are grouped. Programs can only appear once in the Controller Organizer and cannot be shared by multiple tasks. Specify Task Priorities Each task in the controller has a priority level. The operating system uses the priority level to determine which task to execute when multiple tasks are triggered. You can configure periodic tasks to execute from the lowest priority of 15 up to the highest priority of 1. A higher-priority task will interrupt any lowerpriority task. The continuous task has the lowest priority and is always interrupted by a periodic task. The CompactLogix controller uses a dedicated periodic task at priority 6 to process I/O data. This periodic task executes at the RPI you configure for the CompactBus, which can be as fast as once each millisecond. Its total execution time is as long as it takes to scan the configured I/O modules. How you configure your tasks affects how the controller receives I/O data. Tasks at priorities 1…5 take precedence over the dedicated I/O task. Tasks in this priority range can impact I/O processing time. For example, if you use the following configuration: • I/O RPI = 1 ms • a task of priority = 1…5 that requires 500 s to execute and is scheduled to run every millisecond this configuration leaves the dedicated I/O task 500 s to complete its job of scanning the configured I/O.

Allen Bradley Main Products:

1. SLC500:1747/1746 series 2.MicroLogix: 1761/1763/1762/1766/1764 series 3.CompactLogix: 1769/1768 series 4. The ControlLogix: 1756/1794/1760/1788 series 5. PLC-5:1771/1785 series 6.2711,2711P PanelView man-machine interface, touch screen, operation panel 7.22A,22B, 20 small frequency converter,150 soft starter 8. ProSoft: MVI69 / PS69 / MVI56 / MVI94 / MVI71 / MVI46/3150 9. ICS TRIPLEX: T8431 / T8461 / T3401 / T8310

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