6/17/2023 0 Comments Electric eye timerThe controller is equipped with on-board IO that allows the sensor to be wired directly into the controller without the need of additional hardware. The wiring example below displays a wiring scheme of the SICK photo eye using an Allen Bradley 1606-XLE power supply and a CompactLogix L16ER programmable logic controller. A mismatch of sensor output and input will not allow the device to function as expected. The PNP and NPN variants will require inputs of the sinking and sourcing type respectively. The trade-off is that a mechanical contact is much slower than a solid state output. A contact based output will close or open an input signal and will be flexible in the type of signal fed into the sensor. There are three types of sensor outputs the user should be familiar with: contact, PNP and NPN. This means that the input that the sensor will tie into has to be of the sinking type. The SICK WL12-3P2431 photo eye provides a PNP switching output. Once the object reflects the signal, the photo eye is set and the signal is sent back to the programmable logic controller. The reflective photo eye will emit an infra-red signal and capture it when an object is placed in front of it. The most cost-effective sensor will contain both the emitter and receiver within the same housing. In general, an application may require a certain type of sensor or be satisfied with either type. It is important to understand the differences that make them unique and which one is applicable for a specific project. There are three main types of photoelectric sensors on the market. We’ll explore the exact wiring of a sensor below. Generally, they’ll require connections to a voltage source, ground and return a single point that will send a HIGH or LOW signal depending on the status. They come in many electrical configurations. Doing so allows for more precise detection and less erroneous triggers caused by the external environment.Īs previously mentioned, photo eyes are input devices to a controller, PLC or a remote IO module. In addition to a single beam, certain photo eyes are combined with a reflector across the target. Based on what’s placed in front of the sensor as well as the parameters of the device, it may turn on or turn off. The logic, however, will remain the same.Ī Photo Eye will emit an infrared signal and capture the signal reflected back to it. You can consult the official documentation to see the different syntaxes. The only difference will be a syntax specific to each language. Note that the package's operation of the package is the same regardless of the language used. For this example, we will use Python codes to communicate with a virtual PLC (PLCSim Advanced). It is an open-source package (or library) developed for several languages, such as VB, C++, Java, Python.etc, which allows us to communicate inherently via the S7 protocol (GET/PUT access).In this tutorial, you will learn how to use Snap7 to communicate with an S7 PLC. It has never been easier to communicate with PLCs or other industrial devices.If you wantwould like to develop a solution to communicate with a Siemens PLC, Snap7 is the ideal tool. Their adoption offers great flexibility when choosing equipment and dramatically facilitates communication between several different devices. Industrial Ethernet and other TCP communication protocols have become a standard in the industry.
0 Comments
Leave a Reply. |