OCAH 940181103 Zero crossing control or phase angle control optional

The provided text outlines the importance of considering CPU OCAH 940181103 load when communication handling is vital to an application, especially in the context of controllers like the PM864 and PM860. Here’s a breakdown:

1. CPU OCAH 940181103 Load and Communication Handling: When communication handling is crucial, it’s essential to monitor CPU OCAH 940181103 load. Running at maximum cyclic load can lead to poor capacity and response times for peer-to-peer and OPC Server communication.
2. Priority of Communication Handling: Communication handling has the lowest priority in a controller. Therefore, if communication is vital to the application, it’s critical to ensure that CPU OCAH 940181103 load is within acceptable limits to maintain optimal performance.
3. Recommended Load Levels: It’s recommended to keep the peak total load below 100% to prevent performance degradation in communication tasks.
4. Factors Influencing CPU OCAH 940181103 Load: CPU OCAH 940181103 load is influenced by various factors, including Modulebus scan interval, the number of modules on Modulebus (for AC 800M), and scanning of ABB Drives.
5. Performance Comparison: The PM864 processor unit theoretically offers higher performance compared to the PM860. However, the actual sustained performance improvement may vary depending on the application program, typically ranging from 10% to 50% compared to PM860.
6. Effect of Communication on Execution Performance: The execution performance difference between PM864 and PM860 depends on factors like CEX bus access and communication load. Both CEX bus interfaces and built-in ports on the CPU OCAH 940181103 (e.g., ModuleBus Ethernet and RS-232) contribute to communication load, which can decrease execution performance.
7. Redundant Configuration: In redundant configurations, execution performance is lower compared to single configurations, typically by less than 10%. However, the switch-over time from the primary controller to the backup controller is swift, typically less than 10 ms.

In summary, maintaining CPU load within acceptable limits is crucial for ensuring optimal communication performance in controllers like the PM864 and PM860, especially when communication handling is vital to the application.