Automating Manufacturing Systems with PLCs by Hugh Jack

By Hugh Jack

A detailed exam of producing keep an eye on structures utilizing established layout tools. issues contain ladder good judgment and different IEC 61131 criteria, wiring, conversation, analog IO, dependent programming, and communications. Allen Bradley PLCs are used generally in the course of the e-book, however the formal layout tools are appropriate to such a lot different PLC manufacturers. a whole model of the booklet and different fabrics can be found online at

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Lower levels can result in failure to operate, voltages above shorten life. • Rated Current - The maximum current before contact damage occurs (welding or melting). ) An electrical layout is needed for a hydraulic press. The press uses a 24Vdc double actuated solenoid valve to advance and retract the press. This device has a single common and two input wires. Putting 24Vdc on one wire will cause the press to advance, putting 24Vdc on the second wire will cause it to retract. The press is driven by a large hydraulic pump that requires 220Vac rated at 20A, this should be running as long as the press is on.

1 com 2 com 3 com 4 com 5 com 15. Three 120Vac outputs are to be connected to the output card below. Show the 120Vac source, and all wiring. V 00 01 02 03 04 05 06 07 16. Sketch the wiring for PLC outputs that are listed below. 8 ASSIGNMENT PROBLEMS 1. Describe what could happen if a normally closed start button was used on a system, and the wires to the button were cut. 2. Describe what could happen if a normally open stop button was used on a system and the wires to the button were cut. 3. a) For the input (’in’) and output (’out’) cards below, add three output lights and three normally open push button inputs.

Consider the example of a light bulb. If it can only be turned on or off, it is logical control. If the light can be dimmed to different levels, it is continuous. Continuous values seem more intuitive, but logical values are preferred because they allow more certainty, and simplify control. As a result most controls applications (and PLCs) use logical inputs and outputs for most applications. Hence, we will discuss logical I/O and leave continuous I/O for later. Outputs to actuators allow a PLC to cause something to happen in a process.

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