The IEC 61131-3 standard does not fully support all requirements for object oriented programs. Maximum 15 IO station (remote IO) per controller is recommended to keep efficiency. Using remote IO’s gives more flexibility in panel design. In addition there will be more restriction in locating the controller in control panel if using the Module Bus (to connect IO’s). Therefore IO scan time will increase the CPU load. The reason is the Module Bus IO scanning is controlled by the main processor (CPU) of the PLC. It is recommend not to use the Module Bus for connecting IO’s to the AC 800M controller. S800 I/O is a distributed and modular I/O system that communicates with controllers over PROFIBUS-DP (remote) or via Module Bus (direct). Various I/O systems can be connected to the AC 800M controller, either directly (S800 I/O) or via PROFIBUS. Multiuser functionality of PDA saves time and efforts by providing access to its database for engineering team all at the same time. Assigning CAD library (ELCAD) by ASCII files.Assigning process objects to the signals.Allocating signals to the physical channels.Assigning signal lib to process objects and generating signals. ![]()
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