PLC PROGRAMMING- COUNTER INSTRUCTION

Dec 10, 20201 like969 views

There are three types of counter function blocks used in PLC programming: 1) Up counters that count each event and set the output when reaching the limit, 2) Down counters that count down from a limit to zero and set the output, and 3) Up-down counters that can count in both directions and set two outputs depending on reaching the limits. Each type has inputs to count, reset, and load the counter value and an output triggered at the limit. Exercises are provided to write LAD programs demonstrating each counter type.

PLC M10
S.S.Paheerathan 1
PLC COUNTER
 A PLC counter is a function block that counts up or down until it
reaches a limit. When the limit is reached the output is set.
 An example of this could be to keep track of how many times a
process has been completed. Or how many products has been
produced.
COUNTERS IN PLC PROGRAMMING:
TYPES of Counter Function Blocks
1. UP COUNTER (CTU)
2. DOWN COUNTER (CTD)
3. UPDOWN COUNTER (CTUD)
UP COUNTER (CTU)
 Up counters are usually used to keep track of how many
times an event has happened
Each pulse on the count input (CU) will increase the current
counter value (CV) by 1. When CV is greater than or equal to
the counter limit (PV) the output (Q) is set. A pulse on the reset
input (R) will reset the value of CV to 0.

PLC M10
S.S.Paheerathan 2
DOWN COUNTER (CTD)
 Down counter will count down from a certain number until it
reaches 0.
 Each pulse on the count input (CD) will decrement current
counter value (CV) by 1. When CV is less than or equal to 0 the
output (Q) is set. A pulse on the load input (LD) will assign the
value of counter limit (PV) to CV.
UP-DOWN COUNTER (CTUD)
 Up-down counter which can count both ways.

PLC M10
S.S.Paheerathan 3
 Each pulse on the count input (CU) will increase the current
counter value (CV) by 1. And each pulse on the count input
(CD) will decrement current counter value (CV) by 1.
 When CV is greater than or equal to the counter limit (PV) the
output (QU) is set. When CV is less than or equal to 0 the output
(QD) is set.
A pulse on the reset input (R) will reset the value of CV to 0. A
pulse on the load input (LD) will assign the value of counter
limit (PV) to CV.
EXERCISES (Submit your Answers within one week)
1)Write a PLC LAD Program using a UP Counter to
explain it.
2)Write a PLC LAD Program using a DOWN
Counter to explain it.
3)Write a PLC LAD Program using a UP-DOWN
Counter to explain it.

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CCTV systems use video cameras to transmit signals to monitors for security purposes. There are two main types of CCTV systems: wired systems connect cameras to recording devices and monitors using cables, while wireless systems attach radio transmitters to cameras and receivers to monitors. CCTV cameras come in different types depending on whether they are used indoors or outdoors, and provide day/night surveillance capabilities. Key elements of a CCTV system include cameras, lenses, monitors, recording devices like DVRs, storage, cables, and power supplies. CCTV cameras are commonly installed in schools, shops, hospitals, bars and other public areas for security and crime prevention.

CCTV System - Close circuit television System - UCJPaheerathan Sabaratnam

This document provides an overview of CCTV (closed-circuit television) systems. It defines CCTV as using video cameras to transmit signals to specific monitors rather than broadcasting openly. It lists reasons for using CCTV like crime prevention and reducing costs. The key elements of a CCTV system are described as cameras, lenses, monitors, DVRs/NVRs, cables, storage devices, and power supplies. Different types of CCTV systems and cameras are also outlined.

CCTV System - Close circuit television System - UCJPaheerathan Sabaratnam

This document summarizes the key elements of a CCTV (closed-circuit television) system. It describes two main types of CCTV systems: wired and wireless. Important elements that are discussed include cameras, lenses, monitors, and DVR (digital video recorder). Different types of cameras are outlined, including indoor cameras, outdoor cameras, IR (infrared) day/night cameras, dome cameras, bullet cameras, and PTZ (pan-tilt-zoom) cameras. Advantages of CCTV systems include increased security, easy maintenance, and assisting police. Disadvantages include limited camera views, required maintenance, potential hacking, and privacy issues.

CCTV System - Close circuit television System - UCJPaheerathan Sabaratnam

This document provides an overview of CCTV systems, including their components and types. It discusses the differences between analog and IP CCTV solutions. Analog systems use coaxial cables and DVRs for storage, while IP systems are wireless and use network video recorders. Camera selection depends on factors like lens, indoor vs outdoor use, video codec, and motion detection. CCTV is used in applications like bars, cash rooms, car parks, stadiums, and schools to provide video surveillance.

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PLC PROGRAMMING- COUNTER INSTRUCTION

1. PLC M10 S.S.Paheerathan 1 PLC COUNTER  A PLC counter is a function block that counts up or down until it reaches a limit. When the limit is reached the output is set.  An example of this could be to keep track of how many times a process has been completed. Or how many products has been produced. COUNTERS IN PLC PROGRAMMING: TYPES of Counter Function Blocks 1. UP COUNTER (CTU) 2. DOWN COUNTER (CTD) 3. UPDOWN COUNTER (CTUD) UP COUNTER (CTU)  Up counters are usually used to keep track of how many times an event has happened Each pulse on the count input (CU) will increase the current counter value (CV) by 1. When CV is greater than or equal to the counter limit (PV) the output (Q) is set. A pulse on the reset input (R) will reset the value of CV to 0.

2. PLC M10 S.S.Paheerathan 2 DOWN COUNTER (CTD)  Down counter will count down from a certain number until it reaches 0.  Each pulse on the count input (CD) will decrement current counter value (CV) by 1. When CV is less than or equal to 0 the output (Q) is set. A pulse on the load input (LD) will assign the value of counter limit (PV) to CV. UP-DOWN COUNTER (CTUD)  Up-down counter which can count both ways.

3. PLC M10 S.S.Paheerathan 3  Each pulse on the count input (CU) will increase the current counter value (CV) by 1. And each pulse on the count input (CD) will decrement current counter value (CV) by 1.  When CV is greater than or equal to the counter limit (PV) the output (QU) is set. When CV is less than or equal to 0 the output (QD) is set. A pulse on the reset input (R) will reset the value of CV to 0. A pulse on the load input (LD) will assign the value of counter limit (PV) to CV. EXERCISES (Submit your Answers within one week) 1)Write a PLC LAD Program using a UP Counter to explain it. 2)Write a PLC LAD Program using a DOWN Counter to explain it. 3)Write a PLC LAD Program using a UP-DOWN Counter to explain it.

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