PLC Programming Tutorial for Beginners

In this lesson we will learn how to write a PLC program using an "S7 300” PLC and “STEP 7” software.
We have two pumps which are being used to transfer two separate liquids into this tank.Inside the tank there are two level switches installed in the lower and upper parts of the tank respectively.

There is also an electrically powered mixer inside the tank which starts working for a defined period of time, mixing the two liquids together after the tank has filled.
We also have a discharge valve in the bottom of the tank which controls the draining of the liquid from the tank.
When the level of the liquid drops to the level of the switch's position the contact closes, sending a 24 volt DC signal to the PLC input.

We want to write the program so that when the level of the liquid reaches this minimum, the pumps will be activated and begin filling the tank with the liquids. 
The pumps continue filling the tank until the level reaches its maximum at the higher level switch. When this hap…

Siemens PLC - What exactly is Profibus-DP in layman's terms?

Today Profibus-DP is one of the most commonly used networks in industrial automation. Profibus stands for “Process Field Bus” and “DP” sands for “Decentralized Peripherals”. In this video we’re going to learn all about Profibus-DP and what exactly it decentralizes.

Using Profibus-DP, instead of wiring each individual sensor, actuator or other facility to the PLC individually, we can install a set of “remote I/Os” next to these facilities in the field area and then transfer the data to the control area using a single RS-485 cable. This can decrease the cost of wiring dramatically and on the top of that, since the data transmission method here is “digital”, industrial environment noise has less of an impact on data, so data communication between the control and field areas will be more robust.

Siemens TIA Portal

Divisi Industri Otomatisasi dari Siemens saat ini memperkenalkan Totally Integrated Automation Portal (TIA Portal) – software otomatisasi pertama dengan Engineering Environment dan Software project terpadu. Software ini memudahkan para penggunanya untuk melakukan pengembangan dan komisioning terhadap sistem otomatisasi secara cepat dan intuitif, yang memberikan efisiensi lebih terhadap waktu dan biaya yang diakibatkan oleh adanya berbagai macam software dalam melakukan integrasi. Didesain sedemikian rupa untuk efisiensi tinggi dan penggunaan yang mudah, TIA Portal telah disesuaikan untuk para pemula dan professional. Untuk selanjutnya TIA Portal ini merupakan dasar utama dari semua paket software engineering di kemudian hari untuk konfigurasi, pemrograman dan komisioning produk perangkat otomatisasi yang ada dalam portofolio produk Totally Integrated Automation dari Siemens. Sebagai contoh adalah New Simatic Step 7 V11 automation software untuk Simatic PLC dan Simatic WinCC V11 untuk …

Migration Guide: SIMATIC S7-300/400 to SIMATIC S7-1500

This migration guide contains recommendations and notes for users who are currently using SIMATIC S7-300/400 automation systems and plan to migrate to the new SIMATIC controller generation S7-1500.

The new controller generation SIMATIC S7-1500 has an up-to-date system architecture and, together with TIA Portal, offers new and efficient programming and configuration options. To be able to use these advantages, it is important that users who are currently using SIMATIC S7-300/S7-400 automation systems and plan to migrate to the new SIMATIC controller generation SIMATIC S7-1500, develop a detailed comprehensive concept for planning and implementing the pending migration. This requires thorough clarification in the run-up to migration.
Figure 1

The objective of this document is to support plant migration to a modern controller generation and cover the most important questions that may arise in this context. This document contains recommendations and notes for this migration. This document cov…

LOGO! 8 - High performance at a low price

New features • Eight devices with an onboard Industrial Ethernet interface in a space-saving design (4 MW)  • Crystal-clear display with six lines and three selectable background colors  • Optional LOGO! CMR2020 and CMR2040 communication module  • Integrated web server for hassle-free programming via remote control, IWLAN, or the Internet

High performance at a low price Compared with its predecessor, LOGO! 0BA7, the innovated LOGO! 8 logic module offers more functionality in its spacesaving design of only 4 MW, at lower costs. Eight basic devices with and without display and for different voltage ranges have the same range of functions, which makes it very easy to choose the required version. Externally, the crystalclear, perfectly readable display, which now features six lines with 16 characters each, catches the eye. The user now benefits from twice as many characters per notification than before, as well as three interchangeable background colors. For greater visualization demands, …

Simatic ET 200SP CPU / ET 200SP Open Controller

Compact controllers for distributed applicationsThe new Simatic ET 200SP CPU Distributed Controller is a modular distributed controller that is compact and flexible. Thanks to its compact design, it requires little space in the control cabinet. Because it has the same storage systems, volumes, and features as the Simatic S7-1511 and S7-1513 CPUs, customer programs with varying design types can be used. Three Industrial Ethernet ports with variable bus adapters (RJ45, FC, SCRJ) have been integrated for flexible bus connection. Option handling in the central configuration also makes it possible to flexibly retrofit options without engineering effort. 

The distributed controller series is rounded off with the first 1510SP F CPU and 1512SP F CPU for modular and failsafe automation. This makes it possible to implement standard and failsafe applications using one controller in the ET 200SP. Another benefit is its high investment protection, because once a user program has been developed, TIA…

What can a PLC do? Why do we use them?

The meaning of PLC… “PLC” means “Programmable Logic Controller”, that’s clear. The word “Programmable” differentiates it from the conventional hard-wired relay logic. It can be easily programmed or changed as per the application’s requirement. The PLC also surpassed the hazard of changing the wiring. The PLC as a unit consists of a processor to execute the control action on the field data provided by input and output modules. In a programming device, the PLC control logic is first developed and then transferred to the PLC. So, what can a PLC actually do? It can perform relay-switching tasks.It can conduct counting, calculation and comparison of analog process values.It offers flexibility to modify the control logic, whenever required, in the shortest time.It responds to the changes in process parameters within fractions of seconds.It improves the overall control system reliability.It is cost effective for controlling complex systems.It trouble-shoots more simply and more quicklyIt can …