This is very important, because now the program can perform the next correct step in its sequence. So the program knows what´s going on in the machine. The sensors give out an electrical signal, each signal goes by wire on an input of the Simatic unit. All this information is necessary for the program. For example, how fast the motor rotates, what the temperature is or when the current action is completed. A sensor gives information about different situations in the machine. There are basically two ways of communication:įrom the machine to the Simatic “Low” signal: temperature is still allowed.“High” signal: temperature exceeded the limit.Finally these signals are important if an action in the machine happens or not.Įxample for different signals at the output to a motor:Įxample for different signals at the input coming from a thermometer in the machine: These are different electrical definitions. As the case may be the inputs and outputs are set on a “High” signal or on a “Low” signal by the program. That makes a communication between the Simatic and any machine possible. Both are connected by electrical wires with the machine. The running program on the Simatic controls these inputs and outputs. The Simatic also has some inputs and outputs. ![]() Simatic is similar to a digital computer which can store and run programs.
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