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I was asked how to program a random number generator in a PLC that does not have a random number function. In this example, the person was referring to an AB/Rockwell SLC 500. I remembered that question was asked in the top three PLC discussion boards too, yet no one had given a detailed answer with an example. So I wrote the article about the Universal Exponential Random Number Generator.
Before introducing that article here, I should go over the random number generator (RNG) as it relates to PLCs. The range of RNGs PLC programming options, vary greatly in predictability and functionality. From the low end of a simple low entropy linear biased pseudo logic or formula to the high end of the exponential random number generator that gives a more true random number. The exponential ladder logic PLC programming example and approach below is the least predictable (most random) and balanced number generator approach.
Most programmers go with the low entropy pseudo formula approach. PACs like the RSLogix 5000 have even more options, random function, structured text, etc. etc. Of course, if the PAC has a random function, that is more likely to be used even though it may have low entropy. In the end, it always comes down to the system's needs.
What you will see in the video below is the example detailed in the article (linked to above), running live.
This article explains in detail how to program a random number generator in a PLC that does not have a Random (RND) or Pseudo-Random Number Generator (PRNG) function. This detailed example uses strictly a Ladder Logic approach so it is universal to any brand of PLC or PAC.
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When spinning equipment is out of balance. Vibration from out-of-balance rotating equipment can be frightening. The ground shakes, machines jump about, hold down bolts come loose and parts break. An unbalanced rotating body will produce forces on its bearings and transmit them throughout its structure and into the foundations.
Pump motor vibration article. This basic machine balancing information like balancing rotors is helpful in pump vibration analysis. See and share https://trade-school.education/pump-motor-vibration.htm
Helping schools and companies with the hands-on challenge to delivery training remotely. Training simulation software is the solution. Read more about both plannings for the current and future Coronavirus (COVID19) Quarantine and how to utilize industrial training simulation software to put more of that hands-on training back into distance learning. See ...…Continue
Overall Equipment Effectiveness (OEE) continues to gain acceptance as an effective method to measure production floor performance. Capturing and recording accurate production floor information is critical for producing reliable OEE Reports.
OEE = Availability X Performance Rate X Quality Rate
Availability – Percent of scheduled production (to measure…