This article will be geared towards the curious, I am not going to try to train you how to work with the subject materiel.
But you will be able to converse intelligently after reading this.
4-20ma can be either an input or output from the perspective of a PLC, (Programmable Logic Controller)which was covered in an earlier article.
The PLC specialty cards necessary are referred to as Analog cards(both input and output types).
MA stands for milliamp, a measurement of current flow. 4-20 is the lower and upper limits of this defined scale.
Continue reading “What is 4-20 ma?”
One example is the use of this scale to order a motor to run at a specific speed, with 4ma representing stopped and 20ma representing full speed.
Drives can be found everywhere in manufacturing. In fact, Industrial
output would be reduced by a considerable amount without them.
audience for this article is people not necessarily technically
inclined, or simply work in related areas, so I will try to refrain
from getting too technical and provide a view for the curious.
Continue reading “The mystical ways of VFD’S”
Lets have a fun little discussion about Human Machine Interface.
The discussion will be a general overview and will assume no previous knowledge about the subject. Continue reading “Some info about Human Machine Interface displays…”
It seems to me that most information available on this topic assumes a moderate knowledge level before beginning their discussion, so I intend to break this down a little to accommodate those of you who may not have even heard of PLC’s before today. Along the way, I will share my perspective as someone who has been working “hands-on” since the late eighties.
The most basic form of PLC’s are hardened, industrialized PC’s which provide inputs and outputs. Continue reading “A little about PLC’s”