Before revision: For example, a binary input going from a thermometer on a machine to a SIMATIC device might have the following meanings: “High” signal: Temperature exceeded an operating limit “Low” signal: Temperature is within expected limits Based on this input, and other factors, the program on the SIMATIC device might send a binary output signal to the same machine with the following meanings: “High” signal: Run the motor “Low” signal: Stop the motor More complex inputs, outputs, and calculations were also supported as the SIMATIC line developed.
After revision:  More complex inputs, outputs, and calculations were also supported as the SIMATIC line developed.