Issue link: https://iconnect007.uberflip.com/i/1213413
FEBRUARY 2020 I PCB007 MAGAZINE 17 languages and platforms. OML allows equip- ment suppliers and users to create recipes, control equipment, sound alarms, and collect data to solve problems automatically. SEMI's SECS/GEM Protocol SEMI's SECS/GEM was established in the 1980s and 1990s by the semiconductor indus- try and has been continuously updated to to- day. There are over 900 English SEMI Standards with many more in Korean, Japanese, and Chi- nese. SEMI also has standards for other indus- tries like photovoltaic. The standards are open and non-proprietary. SEMI's documentation is useful to establish messages and responses for PCB fabrication protocols. Like IC fabrication, the PCB fabrication process is thermodynamic, so the IC fab model is very useful for PCB fab- rication and is different than the kinematic PCB assembly model. It has been updated with current wireless networking and security and is a convenient model for additional PCB au- tomation [6] . SEMI has PCB fabrication and assembly advisory boards working to connect the en- tire electronics supply chain into one digital thread. Because of accessibility, originality, and security, SEMI is looking at "distributed ledger technologies" (blockchain) as a possible Hardware There are two unique pieces of "plug and play" hardware in Siemens' IoT solution. They are: • System processing unit (SPU): The factory gateway for networking and line controller for connections to machines • Data Acquisition Unit (DAU): Connects machines and manual processes using a variety of physical interfaces, such as RS232, digital I/O, USB, HDMI, LAN, SME- MA (Hermes), and light tower sensors. Data Formats OML uses the JavaScript Object Notation (JSON) standard to represent each message. The use of JSON in the software industry has rapidly increased year on year, with the format now widely used in most web-based technol- ogy and across the Internet generally. For ex- ample, JSON can represent the same data, us- ing significantly less space than XML, which means performance gains. However, like XML, JSON is still human-readable and can repre- sent complex data. JSON is easily compressed to reduce size for further efficiency. JSON is a fully open standard with mature future support in most major programming Figure 7: CFX messaging. (Source: IPC)