By Hugh Jack
A close exam of producing keep watch over platforms utilizing dependent layout tools. issues comprise ladder common sense and different IEC 61131 criteria, wiring, communique, analog IO, established programming, and communications. Allen Bradley PLCs are used largely throughout the publication, however the formal layout equipment are acceptable to such a lot different PLC manufacturers. an entire model of the ebook and different fabrics can be found online at http://engineeronadisk.com
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Additional resources for Automating manufacturing systems with PLCs
9. What will happen if a DC output is switched by an AC output. 10. Explain why a stop button must be normally closed and a start button must be normally open. 11. For the circuit shown in the figure below, list the input and output addresses for the PLC. 22 program. 200 201 A 100 202 101 203 204 solenoid valve 205 206 207 com 102 103 104 + 24VDC B C 105 106 107 + 12VDC com 12. We have a PLC rack with a 24 VDC input card in slot 3, and a 120VAC output card in slot 2. The inputs are to be connected to 4 push buttons.
AC is easier, it has a zero crossing 6. it will lead to premature failure 7. by using separate modules, a PLC can be customized for different applications. If a single module fails, it can be replaced quickly, without having to replace the entire controller. 8. AC input conditioning circuits will rectify an AC input to a DC waveform with a ripple. This will be smoothed, and reduced to a reasonable voltage level to drive an optocoupler. An AC output circuit will switch an AC output with a triac, or a relay.
X x L U Some PLCs will allow immediate outputs that do not wait for the program scan to end before setting an output. ) x IOT Note: Outputs are also commonly shown using parentheses -( )- instead of the circle. This is because many of the programming systems are text based and circles cannot be drawn. 2 A CASE STUDY Problem: Try to develop (without looking at the solution) a relay based controller that will allow three switches in a room to control a single light. 14 Solution: There are two possible approaches to this problem.
Automating manufacturing systems with PLCs by Hugh Jack