Showing posts from 2015

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 …

Comparison of Soft Starting and Frequency Converter Motor Starting

Soft starting A soft starter is, as you would expect, a device which ensures a soft starting of a motor. A soft starter has different characteristics to the other starting methods. It has thyristors in the main circuit, and the motor voltage is regulated with a printed circuit board. The soft starter makes use of the fact that when the motor voltage is low during start, the starting current and starting torque is also low. Motor soft starter Advantages // Soft starters are based on semiconductors. Via a power circuit and a control circuit, these semi-conductors reduce the initial motor voltage. This results in lower motor torque. During the starting process, the soft starter gradually increases the motor voltage, thereby allowing the motor to accelerate the load to rated speed without causing high torque or current peaks. Soft-starting curve – Synchronous speed – Full load torque (left) and Full load current (right)
Soft starters can also be used to control how processes are stopped. S…

PLC Implementation Of Forward/Reverse Motor Circuit With Interlocking

Forward/Reverse Motor Interlocking Figure 1 illustrates a hardwired forward/reverse motor circuit with electrical and push buttoninterlockings. Figure 2 shows the simplified wiring diagram for this motor. The PLC implementation of this circuit should include the use of the overload contacts to monitor the occurrence of an overload condition. The auxiliary starter contacts (M1 and M2) are not required in the PLC program because the sealing circuits can be programmed using the internal contacts from the motor outputs. Figure 1 – Hardwired forward/reverse motor circuit
Low-voltage protection can be implemented using the overload contact input so that, if an overload occurs, the motor circuit will turn off. However, after the overload condition passes, the operator must push the forward or reverse push button again to restart the motor. Figure 2 – Forward/reverse motor wiring diagram
For simplicity, the PLC implementation of the circuit in Figure 1 includes all of the elements in the hardw…