Automating Manufacturing Systems with PLCs by Hugh Jack

By Hugh Jack

A detailed exam of producing regulate platforms utilizing based layout tools. themes contain ladder common sense and different IEC 61131 criteria, wiring, verbal exchange, analog IO, dependent programming, and communications. Allen Bradley PLCs are used generally in the course of the publication, however the formal layout tools are acceptable to such a lot different PLC manufacturers. an entire model of the publication and different fabrics can be found online at

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A) For the input (’in’) and output (’out’) cards below, add three output lights and three normally open push button inputs. b) Redraw the outputs so that it uses a relay output card. x + - 0 V 1 0 2 1 3 2 4 3 5 4 6 5 7 6 com 7 + - 4. Draw an electrical wiring (ladder) diagram for PLC outputs that are listed below. - a solenoid controlled hydraulic valve - a 24Vdc lamp - a 120 Vac high current lamp - a low current 12Vdc motor 5. Draw an electrical ladder diagram for a PLC that has a PNP and an NPN sensor for inputs.

If the stop button is pushed it will open the switch, and power will not be able to flow to the control relay and output power will shut off. If the stop button is damaged, say by a wire falling off, the power will also be lost and the system will shut down - safely. If the stop button used was normally open and this happened the system would continue to operate while the stop button was unable to shut down the power. Now consider the start button. If the button was damaged, say a wire was disconnected, it would be unable to start the system, thus leaving the system unstarted and safe.

11 24 V DC Output Card 120 V AC Power Supply Neut. 5 An Example of a 24Vdc Output Card (Sinking) In this example the outputs are connected to a low current light bulb (lamp) and a relay coil. Consider the circuit through the lamp, starting at the 24Vdc supply. When the output 07 is on, current can flow in 07 to the COM, thus completing the circuit, and allowing the light to turn on. If the output is off the current cannot flow, and the light will not turn on. The output 03 for the relay is connected in a similar way.

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