Introduction to GSV with a UDT Today we’ll discuss how to structure a tag to hold the system clock using the command GSV with a UDT (User Defined Data Type). We use the GSV (Get System Value) command to pull data from the system, and copy that data to a Read More »
Introduction to the PLC-5 1771-ASB (Remote I/O Adapter) The PLC-5 1771-ASB Remote I/O Adapter allows you to communicate from most PLC-5 processors to a remote Chassis. Not all I/O modules can reasonably reside in the same chassis in many cases. For example: You have 250 points of I/O that are Read More »
Introduction to the PLC-5 Enhanced Processor The PLC-5 Enhanced processor controls automation equipment. Program and troubleshoot the processor using RSLogix 5 software. You can also use older software which is DOS based, such as 6200, AI, or Taylor software. Basically, the processor reads data from inputs such as switches. This Read More »
Introduction to the PLC-5 Power Supply The PLC-5 Power supply provides power to the PLC-5 chassis. There are several power supplies to choose from, however, in this post, we will concentrate on the 1771-P4S. Other power supplies include a redundant configuration (such as the 1771-P4R modules), and a 1771-P7, which Read More »
Introduction to the PLC-5 Chassis The PLC-5 Chassis is the device which holds modules. In the PLC-5 system, we will first configure several switches for the desired operation. In this post, we’ll walk through each switch setting for both a PLC-5 Processor, and a 1771-ASB. Another key point is that Read More »
Introduction to PLC-5 Output modules The PLC-5 Output modules control devices. In this post, we will discuss the discrete modules (on/off conditions). The Output modules simply act as a switch to turn on or off a load. Examples of field devices attached to output modules include valves, solenoids, indicator lights, Read More »
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 »
