I have maybe 10-12 of these out in the world, so far so good. The
units are strangely sensitive to their power grounding but no real
problems yet. They have been in operation maybe 2 years in a fairly
good enviornment. Don't know how they would do in harsh conditions.
There were some issues to start with...the grounding I mentioned. The
PLC's would fault and insert a rung of "trash" in the program. The
cabinet it was in had a floating neutral off the control trans. Tech
support said ground the neutral and that would go away. We did, and it
One other thing, I'm sure you wouldn't do this but...one of my large
clients has a machine builder that will stick a PLC in a cabinet
either sideways or flat on its back at the bottom of the can. These
PLC's (DL105's) die in short order probably from overheating.
Steve Cothran wrote in
Thanks for the info Steve. I'll note the grounding issues.
Everything is DIN mounted in our cabinets (why would you not?). There
should be ample room for air circulation. A fan / filter could be
installed if needed. The environment would be a pretty clean machining
We typically use AB or Siemens, but this is a VLB (very low budget)
project, and I only need 11 in and 7 out. This thing is over $100 cheaper
than either the AB or S7-200 and I can get an operator interface for
I have used several of the DL06 and 250 PLC's in 24/7 machines, both
stand alone and networked, and have found them quite reliable.
The oldest has been going for about 5 yrs now and has had no dramas
related to the PLC unit. The DL06 tolerates mains supply bumps and
output shorts pretty well, I have never tried mounting them other than
DIN rail. They live in standard sealed cabinets in a fibreglass dust
contaminated environment, one is regularly about 50 dec C.
We are not a machine builder but a manufacturing facility who makes our
own machines - I have yet to be convinced that higher priced PLC's
deliver any benefit to me. I also use AD pneumatics, encoders, optical &
proximity sensors; most of which live unprotected in very dusty conditions.
Fulliautomatix wrote in
Thanks for the info.
We are in the same boat, a manufacturer of what is basically becoming a
commodity product, but we build our own machines to make the product.
Most of the machines we build are high-speed, extreme precision CNC
machining equipment with robotic integration, so high end PLC/CNC
controls are usually needed.
This particular application is a simple material handling situation
If you do not know the service location. I have found a double regulated
power supply will save your ass in a lot of situations. I also install surge
protection when ever I am unsure of the installation.
I hate going back for nonsense issues.
No worries, it will sit there and chug away for you.
I haven't tried the 'on board' screen but the Uniop EPad06 is a useful
thing as a cheap HMI; and AD's through beam optical fibre sensors are
good for repeatable positioning to 0.5 mm.
High speed...precision...clean!...not dusty you say? mmmmm