From the course: Learning PLC Ladder Logic: 1 The Basics
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Field devices and program instructions - Ladder Logic Tutorial
From the course: Learning PLC Ladder Logic: 1 The Basics
Field devices and program instructions
- [Instructor] Let's take a look on how the field devices and the program instructions work together and how to differentiate between them. To differentiate input devices and input instructions, we refer to the physical devices as a field input devices or contacts and the input within the PLC program as input instructions. There are two common types of field devices relay that we usually deal with. A normally open and a normally closed relay. This can apply to any field device. This is how a normally open pushbutton looks like and this is how a normally closed pushbutton looks like. You can check this document for more details about the different symbols by simply going to page 38, you can find the different symbols for the contacts, switches, and relays. This is the example that we covered for the pushbutton. A normally open pushbutton contact and a normally closed pushbutton contacts. In the simulation software, you can change the type of the contact by right click on the device…
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Programming concept2m 2s
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Input instructions4m 8s
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Output instructions2m 46s
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I/O with a push button and light5m 3s
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I/O with alternating lights2m 16s
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Field devices and program instructions1m 59s
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Normally open (NO) contact with XIC and XIO3m 17s
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Normally closed (NC) contact with XIC and XIO3m 22s
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