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3 is now on (logic 1), and the motor will start when the Start pushbutton is pressed. 0 CPU 59 The PLC program can be expanded to accomodate many commercial and industrial applications. Additional Start/Stop Pushbuttons and indicator lights can be added for remote operation, or control of a second motor starter and motor. Overtravel limit switches can be added along with proximity switches for sensing object position. The applications are only limited by the number of I/Os and amount of memory available on the PLC.

Like analog inputs, analog outputs are generally connected to a controlling device through a transducer. The transducer takes the voltage signal and, depending on the requirement, amplifies, reduces, or changes it into another signal which controls the device. In the following example a 0 - 10 VDC signal controls a 0 - 500 Lbs. scale analog meter. Transducer PLC Analog Output 0 - 10 VDC 64 Analog Weight Meter Voltage - Weight Weight 0 - 500 Lbs Timers Timers are devices that count increments of time.

31 Expansion modules The S7-200 PLCs are expandable. Expansion modules contain additional inputs and outputs. These are connected to the base unit using a ribbon connector. The ribbon connector is protected by a cover on the base unit. Side-by-side mounting completely encloses and protects the ribbon connector. 32 Available expansion The S7-221 comes with 6 digital inputs and 4 digital outputs. These are not expandable. The S7-222 comes with 8 digital inputs and 6 digital outputs. The 222 will accept up to 2 expansion modules.

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