By Hugh Jack
A detailed exam of producing keep watch over platforms utilizing established layout equipment. themes comprise ladder common sense and different IEC 61131 criteria, wiring, verbal exchange, analog IO, dependent programming, and communications. Allen Bradley PLCs are used generally throughout the ebook, however the formal layout tools are appropriate to such a lot different PLC manufacturers. an entire model of the booklet and different fabrics can be found online at http://engineeronadisk.com
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Additional resources for Automating Manufacturing Systems with PLCs
11. 2 12. 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 com + 24VDC - 7 com 13. + 24VDC - 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 com + 24Vdc - hot 220Vac neut. hot 120Vac neut. 3 14. 1 + com 24Vdc - 2 com 3 com 4 com 5 com 15. hot V 00 01 02 03 04 05 06 07 Load 1 Load 2 Load 3 120Vac neut. 4 16. relay output card + 00 power supply 24Vdc - 01 02 hot 03 power supply 120Vac neut.
When switched off it will block current flow in both directions. While switched on it will allow current flow in one direction only. There is normally a loss of a couple of volts across the transistor. A triac is like two SCRs (or imagine transistors) connected together so that current can flow in both directions, which is good for AC current. One major difference for a triac is that if it has been switched on so that current flows, and then switched off, it will not turn off until the current stops flowing.
They are capable of switching both AC and DC outputs. But, they are slower (about 10ms switching is typical), they are bulkier, they cost more, and they will wear out after millions of cycles. Relay outputs are often called dry contacts. Transistors are limited to DC outputs, and Triacs are limited to AC outputs. Transistor and triac outputs are called switched outputs. Dry contacts - a separate relay is dedicated to each output. This allows mixed voltages (AC or DC and voltage levels up to the maximum), as well as isolated outputs to protect other outputs and the PLC.