[Music] in this video we're going to talk about a very important part of any automated industrial process this safety PLC a safety PLC is one of the three parts of a safety instrumented system or sis the SIS can also be referred to as the safety shut down system stated simply the sisters the equipment or process and if an unacceptable condition or risk or an unsafe condition occurs it reacts by the shutdown of the equipment or process safety plcs are constantly guarding against plant failures which could result in harm to people equipment or the environment when
specified hazardous conditions occur the safety PLC will respond by placing the plant in a safe condition the safety PLC is referred to as the logic solver in the safety instrumented system a safety PLC is just like a regular PLC and is programmed the same way but it has extra features like redundancy and added hardware functionality that adheres to a specific safety integrity level or SIL okay back to the safety PLC safety shut down systems are not new before the introduction of safety PLC's plant shutdown conditions were monitored and operated by typical field devices and instruments
and the logic was performed by hardwired relays gone are the days of hard-wired relay logic in both process and safety PLC's you might be thinking well what is the difference between a safety PLC and a regular process PLC physically other than they might be a different color they look exactly the same but that's where the similarity ends the logic in the safety PLC is locked it has safety signatures ensuring that coding has not been changed the safety PLC can perform additional field device checking such as snooping for broken wires failed contacts among other features finally
the safety PLC has the multi-channel capability for redundant IO monitor and operation capability let's review some key points a safety PLC is an integral part of a safety instrumented system or sis when specified conditions happen the safety PLC is charged with placing the plant in a safe condition or sometimes a shutdown state the safety PLC is referred to as the logic solver in the SIS a safety PLC is programmed the same and looks very similar to a regular process PLC but has many extra features for more detailed look at sis and SIL check out our
videos called what is a safety instrumented system and what is an emergency shutdown system you can find the links to these videos in the description newcomers to real bars have free access to one of our online courses you can take advantage of this offer by downloading the real pars app and selecting the first lesson of the PLC hardware course just like this video the lessons are all high-quality and also very easy to follow also for a low monthly feed you'll get full access to an exclusive library of courses on PLC programming and industrial automation topics
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