What is the Best Way to Learn PLC Programming?
Below is my reply to him ...
Hi Andrew: There are many ways, only one Best Way to learn PLC Programming, the real world structured approach at http://plc-training.org going through all 10 phases. Read on for more...
Many will reply to your PLC Programming question with ... "our software", "our video course", "the vendor", "college", etc.
"Most will neglect to clarify the importance of terminology, like when one says "PLC Programming" they actually mean "PLC Training", or vise versa. Or even when one says "PLC Training" they really mean "PAC Training, because they have not learned the vast differences yet. Or when one states they offer "PLC Training" it is really only PLC education, not actual training. So even in the initial question, terminology can be critical to reaching the desired outcome. especialy when the person asking, doesn;t know what they don't know."
The truth is they don't know what they don't know, or it is just a biased/self serving answer. The truth is the 'Best Way' is a blended holistic approach. PLC training containing both real world practical application and typical vendor/manual learning, both hand-on actual training and scholastic education; as a blended learning approach. Yes it is true, the 10 phases at http://plc-training.org will take longer and cost more in the long run. but you asked 'what do I think is the best way?', not what is the quickest or cheapest, or what is a shortcut just to get by in PLC programming.
Also note while I do have a vested interest in my answer above, that does not make my answer any less true. As you will see on the site above, the entry page for each of the 10 phases of PLC Training/PLC programming explain why that part and approach is very important to the overall best way. Also each of the 10 phase pages will have a yellow button at the bottom of each page giving some of the best practices to further justify that real world best practice approach.
Hope this reply helped Andrew, and me sharing helps others.
After reviewing this basic PLC training infographic on troubleshooting the #PLC itself, you're ready to learn how to use the PLC to troubleshoot complex equipment. Head on over to http://bin95.com/Troubleshooting-PLC-Controls-Simulator.htm The more you use the training software, the more your troubleshooting skills improve.
one of the many topics covered in http://bin95.com/reliability_training.htm maintenance refresher set.
*"Bearings are contained within a housing from which a shaft extends. The shaft entry into the housing offers opportunity for dust
(and moisture) to enter the bearing. The shaft seal performs sealing of the gap between the housing and shaft. Choice of the
appropriate shaft seal and seal configurations to protect against dust ingress is critical."
"Bearing housing seals for dusty environments may be either a labyrinth type or a rubbing seal type. The labyrinth type requires a
straight shaft running true. Rubbing seals are the more common and allow for some flexing of the shaft. The sketches below are
conceptual examples of each type of seal. When setting a lip seal into place to prevent dust ingress insure the sealing lip faces
In situations of high dust contamination there may be a need to redesign the shaft seal arrangement for better dust protection than
provided in standard housings. Some ideas which can reduce dust ingress into bearing housings are to :
i. provide two or more seals in parallel. Bearing housings can usually be purchased with combination seals as standard.
ii. retain the housing shaft seals but change from a greased bearing in the housing to one which is sealed and greased for life. If
contamination were to get past the shaft seals, the bearing’s internal seals would protect it.
iii. stand the bearing off the equipment to create a gap between the end of the equipment and the bearing housing while sealing the
shaft at the equipment.
iv. put in a felt seal wipe between the housing and the wall of the equipment to rub the shaft clean. Install of a mechanical seal in
very harsh environments.
v. install a grease barrier chamber sandwiched between two seals. This barrier is separate to the bearing housing and acts as the
primary seal for the bearing. Grease pumped into the chamber will flush out past the seals.
vi. replace the grease barrier chamber instead with an air pressurised chamber.
vii. shield the bearing housing from dust with use of a specially fabricated rubber shroud encapsulating the housing and wiping the
shaft or fit a rubber screen with a hole wiping the shaft over the opening emitting the dust.
viii. flush the bearing with grease by pumping excess grease into the housing and allowing the grease to be forced past the shaft
seals or through a purposely drilled 15 mm hole in the housing. The hole must be on the opposite side of the bearing to the
grease nipple, at the bottom of the bearing housing when in service and between the bearing and seal.
ix. Mechanical seals can be fitted to the shaft with the stationary seal sitting toward the machine and the rotating seal mounted
back along the shaft. Combinations of other seals and wipers can also be used in conjunction with the mechanical seal. Mount
the auxiliary seals so they see the dust/water first and keep the mechanical seal as the last line of protection.*
more ... see http://bin95.com/reliability_training.htm
- Business Industrial NetworkEngineer, Education, Instructor, present
- maintenance automation
I work at Business Industrial Network, who's core business is delivering world class onsite engineering and maintenance training, specializing in Allen Bradley equipment.TLC for PLC" published April 2012 in the Industrial Engineering Magazine.
See also my article titled "PLC Maintenance Management" published in Chemical Engineering Nov 2007
I have also been published in Facilities Engineering Journal [March/April 2002] with article "What is the True Downtime Cost". (Also referenced by several publisher like MaintenanceResources.com, automation.com
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