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Entries for the 'PLC' Category

Siemens S7-1200 Serial Communication

Today, I found myself setting up some simple point-to-point serial communication on a Siemens S7-1200. For the current application, I was writing a simple function block to broadcast data to a Red Lion serial slave display, but there are a varie...


Using an iPhone to Control a Factory

Most Human Machine Interfaces (HMI) are in a static location. Sometimes, this can be inconvenient if you need to check a device (motor, valve, diverter, etc.), but the sight line from the HMI is blocked and you need to be able to watch the device mov...


The Basics of Siemens S7 PLC I/O Addressing

Are you a new user of Siemens PLCs a and wondering what terms like "process image" and "peripheral address" mean? What does the "P" in "PIW" stand for? Are you an experienced user and are too embarrassed ...


March Programming Madness - Let the Nerdament Begin

With the first few rounds of the tournament in the books, I figured it was time to dive into the first round of our programming language tournament (or Nerdament as I like to call it.) For a rundown of the competitors, you can check out the opening b...


March Programming Madness - The Bracket

With the final few plays of the super bowl still fresh in mind, we enter March on the verge of another of the greatest events in sports, the March Madness of Programming Languages. This epic, world-renowned event (not to be confused with the sim...


Iconics, VBA, VBScript, and Writing to OPC Tags

Background DMC has often had to download a high number of values from a SQL server to an OPC server. In the past, this had usually been done with VBA code that was called from an Iconics HMI screen. The code looped through about 600 tags in less t...


High-speed Position Latching using Yaskawa's MotionWorks IEC

I was recently working on a multi-axis Yaskawa-based motion control project and ran into an issue using an in-software position latch. In this case, we were running a servo at fairly high speed and trying to record the encoder position when a sensor ...


Siemens S7-1200 Analog IO

If you find yourself working with Analog IO on the Siemens S7-1200 for the first time, you may wonder how and where to start.  Here are some basic tips for working with Analog IO on this PLC platform.  For the purposes of this blog, I will ...


Siemens PLCS, Networking, and More--DMC at the SITEC 2011 Conference

I recently had the opportunity to attend my first Siemens technical conference. The conference, called SITEC, took place May 16-20 in Atlanta, GA, and Kristie Shea and I represented DMC. SITEC is Siemens’ technical conference where solution par...


DMC to Present at the 2011 Siemens Automation Summit

DMC is excited to attend and present at the Siemens Automation Summit 2011 held from June 27-30 at Disney’s Yacht and Beach Club Resorts in Orlando, FL. The Summit is an annual conference that focuses on the end-users of Siemens automation prod...


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