Programming Counters in PLC Logo! Siemens

The Counters are instrucctions of Control that are Activated when the value predefined is reached and it works "Counting"; The Contadores you can find are UP or Down

COUNT: 0
OFF

Simulating an Up Counter

First, We must to know these concepts:

Counter UP: There are the Counters that the value is +1, in each push or pulse in Counter Block it add +1 at the count

Counter Down: There are the Counters that the value is -1, in each push or pulse in Counter Block it subtract -1 at the count, programmation is very diferent to Counter Up

Software Flag (Mx): Flags "M" are a types of Outputs-Contacts that allow create a lot of logical in our Software, Activate a Flag(M) Coil, means we can use it for a lot of instructions using his Open or Closed Contacts (M using in -||- or -|/|) For programmers, Flags mean create infinite style of programs and is one of the most importants things to consider

Reset: A Reset is a instruction in a Counter that when is actived the Currently Value is back to Start Value in a Up Counter may back to "0" and in a Down Counter to "Start Value defined"

Must Knowledge

Industrial Command
Computation
Electricity
Basic English
First Time with Logo!

MAIN SUMMARY
STEP 1: Necesary Elements
STEP 2: Analice Counter Block in logo!
STEP 3: Counter UP
STEP 4: Simulating Counter UP (VIDEO)
STEP 5: Counter DOWN
STEP 6: Simulating Counter DOWN
STEP 7: Upload Program to Logo!
STEP 8: QUESTIONS AND ANSWERS

STEP 1 : NECESSARY ELEMENTS

First we must to have all components and PLC in LADDER

The Programmable Relay PLC Logo! need a Software to make the Program that control all our process, so we need these elemments:

Notebook or Portable Computer with CD-USB o CD
PLC Logo! V8 Siemens
Communication Cable Ethernet Cat5e o higher
Software PLC Logo Siemens; Logo Soft Comfort V8.0 or higher
Wiring in 220VAC (We use Logo! 220VAC)

NO problem if we dont have the Original CD, we can Download DEMO VERSION Here Download fast! from Siemens WebPage in "Demosoftware" if we have this demo, we may simulate and create a lot of control projects really perfect to practice

STEP 2: Analyse Counter Blocks

We'll Analize our Counter Block in Logo!

The first that we must to know is how the Counter Block Works

Input R: This is Reset of the Counter, when we pushed it, the counter back to "Start Value"
Input Cnt: This is the connection that do the Counter start to count (up or down)
Input Dir: when it's not energized, The Counter is UP (By default); when it is energized, the Counter is DOWN

Before to start to program our Counter is an obligation understand our Counter Block

STEP 3: COUNTER UP

Start to create our program and Configure our Counter Block

At the moment of work with Counters the configuration in UP or DOWN is defined By the Programmer, in this case how we start to work with Counter UP, we must to know that By Default the PLC comes configurated with UP count, By default it add 1+

Our Program with all our blocks must to see like this:

STEP 4: SIMULATING COUNTER UP

We are ready to test and simulate our first Counter UP

COUNT: 0
OFF

Simulating a Counter UP with a defined value "2"

When we our Counter UP has reached the defined value (in this case 2), The Output will be activated; if you press "Reset" The value of counter will be the Start Value

COUNT: 0
OFF

Simulating a Counter Up similar to Telerruptor

We use the Counters for functions like this Telerruptors, always is an advantage in just 1 software make a lot of these instructions; in this case one push button active and desactive, you must follow the programmation in the image ; C001 Activate in "1" and the Output goes to Q1; and C002 Activate in "2"; then C002 Activate a Flag M1, and finally C002-M1 "Reset" both Counters C001 and C002, C001 back to"0" (OFF)

STEP 5: COUNTER DOWN

We are ready to test and simulate our first Counter DOWN

The Down Counter may works like "Countdown" but in this case we need a special configuration and programming using same Counter Block

>Our Program with all our blocks must to see like this:

To Work perfectly with our Counter Down we must to understand these steps:

The configuration must to be like the image; Our Start Value must to be the same that => ON and the other value OFF must be higher than 1 (in this case 1 means => 0 and will work
The Output Contact must to be a Closed Contact in Software |/|
We recommend the Output C00x (Counter) goes to activate a "FLAG (M) -( )-" and a Contact Open M -||-" and use it for some functions

STEP 7: Uploading to LOGO!

After every programmation and new knowledge go to Start!

Remember always if you forget IP of PLC go to => NETWORK => IP ADDRESS, your PC must to be in same Network than PLC (example IP Photo 192.168.0.3), Your PC may has a IP 192.168.0.5

After we have IP of PLC go to Wifi or Internet Icon, click on "Network and Sharing Center" --> Change Adapter Settings --> Ethernet/Realtek/other --> Propierties --> Internet Protocol Version 4 TCP/IPv4 and change IP to same Sub Network PLC with other last number device

If your PLC has been communicated correctly, go to RUN and START your PLC Program!

QUESTIONS AND ANSWERS

HERE IS ANSWERED YOUR QUESTIONS:

Where Can Download Logo Soft Comfort! The Software of PLC Logo? and Buy Original CD?
For the Version DEMO go to Siemens Webpage here or you try in the above external links of Step 2 Here; It Costs around 70 USD (without upgrades) and you can get it in a external company Buy in Automation24 this software may be installed in many computers

Do Counters UP and DOWN use same programmation?
NO, However both use same block, the diferences are the connections in the block and the form to use those; Up starts to count +1, and Down Count in -1 , to see it GO STEP 2

How we activate a Output in a Counter?
First you need your Counter Block C00x ; the Output will activate when the Counter reach the Defined Value; then you must take a Open/Closed Contact in the Side and add the Name of Counter (C00x), REMEMBER the form use a Up Counters VS Down Counter is Very diferent STEP 2

Why Can't Connect with my PLC Logo?
The Communication with PLC Logo! is by ETHERNET (TCP/IP); you should change your Sub-network number in your computer, remember Logo! comes with 192.168.1.x or 192.168.0.x must to try with both options

ElectricalChile

Profiter L'Ingénierie

Programming Counters in PLC Logo! Siemens

The Counters are instrucctions of Control that are Activated when the value predefined is reached and it works "Counting"; The Contadores you can find are UP or Down