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Article | July 3, 2012
Rockwell Automation’s new high-speed ControlLogix 24vdc I/O modules for its programmable automation controller (PAC) platform enable faster machine speeds in a wide range of discrete applications and improve system response time for high-speed sequential control applications.
The Allen-Bradley ControlLogix 24vdc I/O modules, used with the ControlLogix 5570 family of PACs, can significantly improve total System Response Time (SRT) through new hardware technology and peer-to-peer communication capabilities that significantly reduce the time it takes for modules to communicate with the controller. Since SRT equates to the time required for input module response, controller processing and output module response, reducing I/O latency results in higher machine speeds for increased parts production.
For even faster performance, the new modules also function in peer-to-peer mode, bypassing the controller entirely by establishing in-chassis connections that allow I/O modules to communicate directly with each other. Shifting task management to the I/O modules can relieve a controller of the overhead required to process and direct I/O modules, helping improve reliability in program execution and throughput. In peer-to-peer mode, input to output response time can be less than 100 microseconds (μS). The peer-to-peer capabilities are suitable for applications with fast detect-energize sequences, such as high-speed parts rejection.
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