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 https://automationforum.co/2018/04/introduction-plc-hardware.html Inputs In smaller PLCs, the inputs are usually integrated and specified when purchasing the PLC. For larger …
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 …
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 https://automationforum.co/2018/02/programming-logic-devices-plc.html so lets discuss about the program Procedure Automatically injects the container with liquids A and …
Introduction In this Article we are going to learn about – How to wire a PLC to a control panel. Now when we are going to install a PLC, in any panel or any machine, or in any process,First we have to wire up that. So we will understand that, how to wire a PLC. …
A counter is a PLC instruction that either increment (counts up) or decrements (counts down) an integer number value when prompted by the transition of a bit from 0 to 1 (“false” to “true”). Counter instructions come in three basic types: up counters, down counters, and up/down counters. For both UP and Down counters there …
PLC Counter instructions | Example for counter logics Read More »
Introduction There are so many level measuring techniques in this session we are going to discuss about Conductivity probes.Conductivity probes operate on the principle that most liquids conduct electricity. Figure illustrates how a typical conductivity level probe operates An electrode is shown above the liquid level on the left side of the Figure. In the circuit …
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 …
What is PLC? A PLC is a real-time control system, which is a digital computer system for multiple inputs and output arrangements with extended temperature range and immune to noise and resistance to vibration impact compare to the personal computer. There are different types of programming languages for PLC. Common are : Ladder logic Functional …
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 boot.so 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 …
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 …