Introduction to PLC hardware- part 2

Introduction Earlier we discussed about the basics of PLC hardware .This is the continuation of that .In this session we are focussing on inputs and ouput modules of PLC hardware You can check the part 1 here Inputs In smaller PLCs, the inputs are usually integrated and specified when purchasing the PLC. For larger …

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Introduction to PLC hardware part 1

INTRODUCTION Many PLC configurations are available, even from a single vendor. But, in each of these there are common components and concepts. The most essential PLC hardware components are: Components 1.Power Supply – This can be built into the PLC or be an external unit. Common voltage levels required by the PLC (with and without the …

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PLC program for a batch process

Introduction Hey guys in this session we are gonna discuss about a PLC program for a batch process.In my earlier posts i mentioned the basics of PLC so you can check that out by clicking the link below so lets discuss about the program   Procedure Automatically injects the container with liquids A and …

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PLC Ladder logic – Timers

A timer is a PLC instruction measuring the amount of time elapsed following an event. Timer instructions come in two basic types: on-delay timers and off-delay timers. Both “on-delay” and “off-delay” timer instructions have single inputs triggering the timed function. The accuracy and repeatability of the timer are extremely high because the PLC processor generates …

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Permissive circuits in PLC

Introduction A practical application of switching and relay logic is in control systems where several process conditions must be met before a computer is allowed to in this session we are going to discuss about  Permissive circuits in PLC Permissive circuits in PLC A good example of this is the control of the burner for …

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Fail-safe design In control systems, safety is (or at least should be) an important design priority. If there are multiple ways in which a digital control circuit can be designed to perform a task, and one of those ways happens to hold certain advantages in safety over the others, then that design is the better …


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