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Entries for the 'PLC' Category

Beckhoff Drive Diagnostics

Recently, I was working with a client that was using TwinCAT 3 and Beckhoff drives to control machinery. One night, as they were running this machine, the drive faulted. Without any diagnostic message visible on the HMI, they were completely in the d...


The Force Awakens Your PLC

It seems like lately the Force has awakened everywhere. The only corner of the universe that was still dark and quiet was the PLC and factory automation galaxy. To fill the gap I decided to show PLCs the way of the Force. And what could be better tha...


Sharing Tags between Beckhoff PLCs Using ADS Read

Often it becomes necessary to read a few tags from another Beckhoff PLC without setting up a full publisher subscriber EAP system. Automation Device Specification (ADS) reads and writes can be used to do this with very minimal setup, as lon...


Connecting to a Siemens PLC with Access Address

There are occasions when a Siemens PLC may need to be commissioned with a different IP address than the one assigned in the project. In the case of a single PLC, this is no big deal and it is a simple matter to update the project to match the IP addr...


Linking PLC UDT Tags to HMI Faceplates and Pop-ups in TIA Portal V13 SP1

PLEASE NOTE: This blog was written using features available in TIA Portal V13 SP1 Update 1. Some of the functionality shown was removed in Update 3, specifically the ability to multiplex UDTs. Hopefully the rest of the information will be still be he...


Comfort Panel HMI Faceplate Programming with a Siemens PLC

Recently I was working on an S7-300 PLC project that required a fairly advanced HMI, so we chose the Comfort Panel to use Faceplates for the many pop-ups and identical controls required. Creating these Faceplates was a great way to increase our produ...


Connecting Custom Applications to the Factory Floor

DMC has expertise in both industrial and PC-based software development. In other words, we do a great deal of projects involving PLCs; but we also write plenty of complex PC-based apps. But my personal favorites are projects that combine the two. ...


Read the Serial Number or MAC Address of your Siemens PLC

A recent DMC project for an OEM machine builder involved automatically generating log files for each machine. The twist? Each log file needed to be unique and easily traceable to the machine that generated it. This can be achieved using the PLC seria...


UDP Communication on Beckhoff’s TwinCAT 3

Have you ever received a tweet from a machine on the factory floor? These days, modern PLCs interact with the typical PC and Information Technology world (Ethernet, SMTP/emails, SMS/text messaging, cloud technologies), but there often are caveats....


Data Logging with Siemens S7-1200 PLCs

The creation and maintenance of data records for machines is a very important part of keeping machines running efficiently. For example, tracking downtime and uptime is crucial to provide proper maintenance on the machine, while logging stoppages and...


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