Mewbyte - InfoSec Blog

BACnet x Modbus x LonWorks There was no standard industry network protocol for building automation. Building automation  is the automatic centralized control of a building's  HVAC (heating, ventilation and air conditioning) , electrical,  lighting , shading,  Access Control ,  Security Systems , and other interrelated systems through a  Building Management System (BMS) or Building Automation System (BAS) . The objectives of building automation are improved occupant comfort, efficient operation of building systems, reduction in energy consumption, reduced operating and maintaining costs, increased security, historical performance documentation, remote access/control/operation, and improved life cycle of equipment and related utilities. Building automation is an example of a  distributed control system  – the  computer networking  of electronic devices designed to monitor and control the systems in a building. Today there are three inter-o...

  Difference Between PLC, RTU, & IED PLCs and RTUs are both electronic devices; their functionalities overlap with each other.  RTCs are sold with PLC-like features, and PLCs are sold with RTC-like features. Many vendors sell proprietary alternatives and different associated environments to run these programs since the industry made the functional language running RTUs and PLCs standard. RTU                                                                                                          “ RTU” stands for “Remote Terminal Units.” They are also referred to as “Remote Telemetry Units.” An RTU is an electronic device which is controlled by a microprocessor. ...

IEC 61131-3 Programming Languages With so many programmable logic controller (PLC) programming languages and standards from which to choose, what is the right choice for automation and controls applications?    IEC 61131-3:  Programming languages: LD, SFC, FBD, CFC and ST Ladder Diagram remains popular because of its graphical nature. Sequential Function Chart is a graphical language great for expressing state machines and appeals to the graphical nature of engineers. Programming language choices for programmable logic controllers (PLCs) are many. It is said the great thing about standards is there are so many to choose from! While this is meant as sarcasm, in the case of IEC 61131-3 Programming Languages, it is an advantage to have several language standards from which to choose. Figure 1: IEC61131-3 Programming Languages offers languages suited to specific needs. With IEC 61131-3 programming languages,...