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Monday, March 16, 2009

Programmable Logic Controller Facilities

PLC Facilities.

Timers.
Many control systems will require a time delay or delays between different actions. All PLC’s will have programmable timers available.

One shot. (Fleeting Contact, Pulse)
This is a provision in the PLC, which gives an output only for an instant.
C1 is an internal coil. All PLC’s will have an internal coil, which can be called up, without recourse to an external output. They can be used for internal signals.

It is required to start two motors in sequence. Motor 1 is subject to manual push button control or controlled by a float switch. Motor 2 starts automatically following a 20 second delay and provided pressure is below a certain value and a valve is opened. There is a visual indicator of the status of each output and an alarm when 1000 starts have been made.
Posted by John at 12:05 PM
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1 comment:

  1. Anna SchaferDecember 18, 2015 at 8:03 PM

    The Open Source PLC was designed to provide a C programmable PLC for embedded software engineers and programmers.mromarket.com

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