By Hugh Jack
A detailed exam of producing regulate platforms utilizing established layout tools. issues comprise ladder good judgment and different IEC 61131 criteria, wiring, verbal exchange, analog IO, dependent programming, and communications. Allen Bradley PLCs are used broadly during the ebook, 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 info for Automating Manufacturing Systems with PLCs
Example text
Line 020 of the diagram is used to control power to the outputs of the system. The stop button is normally closed, while the start button is normally open. The branch, and output of the rung are CR1, which is a master control relay. The PLC receives power on line 30 of the diagram. The inputs to the PLC are all AC, and are shown on lines 040 to 070. Notice that Input I:0/0 is a set of contacts on the MCR CR1. The three other inputs are a normally open push button (line 050), a limit switch (060) and a normally closed push button (070).
In this case the solenoid valve was wired directly to the output card, while the hydraulic pump was connected indirectly using a relay (only the coil is shown for simplicity). This decision was primarily made because the hydraulic pump requires more current than any PLC can handle, but a relay would be relatively easy to purchase and install for that load. All of the input switches are connected to the same supply and to the inputs. 5 ELECTRICAL WIRING DIAGRAMS When a controls cabinet is designed and constructed ladder diagrams are used to document the wiring.
Both of the switches are powered by the positive/ hot output of the 24Vac power supply - this is like the positive terminal on a DC supply. Power is supplied to the left side of both of the switches. When the switches are open there is no voltage passed to the input card. If either of the switches are closed power will be supplied to the input card. In this case inputs 1 and 3 are used - notice that the inputs start at 0. The input card compares these voltages to the common. If the input voltage is within a given tolerance range the inputs will switch on.