Introduction to PLC-5 Input Modules The PLC-5 Input modules read the status of equipment. Examples of field devices that act as real inputs include limit switches, proximity switches, aux. contacts, and push buttons. Input modules are simply voltage testers. When a voltage is detected at a particular point, the status Read More »
Introduction to delaying outputs on and off In this post, I’ll explain delaying outputs on and off can be used in the SLC500 processor. For example: We have a motor with a fan. When a main motor starts, a fan needs to start two seconds later. When the motor is Read More »
Introduction to PLC-5 Structure The PLC-5 Structure was probably the most common Allen Bradley processors in the Industry. Produced in the 1980’s, this processor began to replace the PLC-2. Many industrial sites still widely use the PLC-5 processor. However, these remaining PLC-5 processors are slowly being replaced by the new Read More »
Introduction to the ControlLogix SCL Command We use the ControlLogix SCL command to SCALE data. This simply means that we convert one range of values to another range of values. For example: We use a pressure transducer to measure pressure. A pressure transducer might convert 0 to 200 psi into Read More »
Introduction to ControlLogix Modbus In this document, we will walk through ControlLogix Modbus examples using the 1756-MVI56E module. The MVI56E-MCM modules allows connections between the Modbus network, and a ControlLogix processor. Before using the MVI module, we will need to set up the configuration such as the IP address for Read More »
Introduction to SLC-500 Remote I/O (1747-SN) There are many reasons to use SLC-500 Remote I/O (1747-SN). Imagine a conveyor system. Ten thousand feet from the local processor chassis, you have 256 points of I/O. With Remote I/O, you could mount a chassis up to 10,000 feet from the local processor Read More »
Introduction to ControlLogix Trapping ControlLogix trapping is important for locating fast moving bits, or infrequent bits. An example would include equipment guard doors. Periodically, a guard door might loose connection, and shut down your equipment. Intermittent problems are very difficult to locate. Since the condition existed for only a fraction Read More »
Introduction to Alexa voice commands to PLC In this post, we will discuss how to send Alexa voice commands to a PLC. This is a simple process, but requires several steps. I’m simply doing an experiment to allow an Alexa voice commands to turn on various inputs on a PLC Read More »
Introduction to the SLC-500 Custom Data Monitor The SLC-500 Custom Data Monitor allows you to monitor data from different places in the project all in one place. In this post, I’ll discuss how to use the custom data monitor. When you troubleshoot your equipment, normally, you look for an output Read More »
Introduction to SLC-500 Basic Instructions When you are new to programming, there are 3 SLC-500 Basic Instructions that are a good place to start. In this document, we will discuss the operation of each of these instructions in ladder logic. These instructions include: XIC (Examine if Closed) — or “Examine Read More »
