Introduction to ControlLogix Messaging over DH+ ControlLogix Messaging over DH+ allows us to read or write data over a DH+ Network. In this case, we will send a message to a PLC-5. We also use the same procedure to send a message to a SLC 5/04 over DH+. The PLC-5 Read More »
Introduction to the PLC-5 Day of Week Counter A PLC-5 Day of week counter is an easy way to find the day of the week for certain events in automation. For example: You want to test an alarm every Monday at 10am. There are complex algorithms that will calculate the Read More »
Why Calculate Sunrise and Sunset in a PLC? In the olden days, you used a photo resistor to detect when the sun has risen or set. The problem with this are obvious. You are adding an extra component that will degrade over time. Not to mention the fact that cloudy Read More »
Introduction to PLC-5 Block Transfers One of the most difficult concepts for most people to grasp is the PLC-5 Block Transfers. Think of Block Transfers as simply a copy instruction. You are copying data from a module to somewhere else in the memory of the processor. The Block Transfer Read Read More »
Introduction to Serial Server over Ethernet There are many applications in which you need a Serial Server over Ethernet solution. You might have a serial device out on the plant floor, that you need to access remotely. One solution to this problem is a Serial over Ethernet server. Basically, you Read More »
Introduction to the 1785-KE Module The 1785-KE module allows you to easily interface with a Data Highway Plus (DH+) Network. Although there are other ways to interface with DH+, I have found this method to be the most cost effective. For example: The 1784-U2DHP module could cost over $2000. You 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 »
