Safety control technology has always lagged behind standard control technology. To illustrate this point, let's review the evolution of automated control systems for decades. Thirty years ago, almost all control systems used relay control, but the cost of installation and maintenance was high, and reconfiguring the system was cumbersome and inflexible. For these reasons, PLCs and other relatively "smart" control technologies have gradually replaced relay control because PLCs have reduced hardware configuration, simplified installation and maintenance, and are flexible enough to adapt to process-oriented control. task. With the expansion of production scale and the continuous advancement of production technology, the complexity of control systems is also increasing. The era of new open fieldbus technology is coming, it can not only coexist equipment of different suppliers. In a bus system, it also simplifies wiring and speeds up the dissemination of information over digital networks. But in fact, the standard fieldbus system is not a perfect bus system, especially in the "security control" there are big loopholes.
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Taking automobile production plants as an example, especially in the highly automated welding and assembly workshops, the emergence of a large number of welding robots and assembly robots has created many dangerous areas requiring safety protection, so safety sensors such as area protection scanning The use of devices, safety light curtains, safety locks, safety carpets, emergency stop switches, etc., has become very common, but the control systems that connect these safety devices are still at the low level of non-bus control systems for "safety relays" or "safety PLCs". The state of control greatly limits the development of production process control systems. However, if these security devices are connected to non-secure fieldbus systems (such as standard Profibus, DeviceNet, etc.), there will be a relatively large security risk, which is an unsecure control state.
Figure 1: shows the wiring of the safety product.
Based on this situation, several of the world's largest automation system companies (such as Siemens, Rockwell Automation, etc.) have combined several well-known safety sensor production companies (such as SICK, OMRON) to jointly develop open, mutual Compatible safety bus systems such as AS-InteRFace safety, Profisafe, DeviceNet Safety, interbus safety and Safety bus p. These safety bus control systems greatly accelerate the pace of control system advancement.
Figure 2: Structure of a standard Profisafe bus system.
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