The most popular photoelectric sensor used is the retro-reflective or reflex mode sensor. One of the advantages of the retroreflective style photoelectric sensors is the light emitter, or light source, and the receiver are in the same enclosure, thus you only have a single device to mount and wire making installation easier and faster. The output of the sensor changes state when the object blocks the light beam between the sensor and the reflector.
“I already have an existing network (PROFIBUS, PROFINET, EtherNet/IP, CC-Link, etc…) so why would I be interested in an IO-Link enhancement?”
The answer is simple, instant SCALABILITY!
What do I gain by having an additional 4 IO-Link channels?
It occurred to me recently that, while linear position sensors are used in a wide variety of industries and applications, all of these applications fall into three broad categories: controlling linear motion, monitoring linear motion, and measuring linear motion.
In parts one and two of this blog series, I described the typical packaging process, how actual runtime is defined, how vision is used to improve runtime, and how vision compares to the use of discrete sensors. In this last installment of this series, I will show some specific examples of how vision sensors have been used in packaging and show two case studies exemplifying the benefits customers achieved with the use of vision in their processes.
Written by: Jeff Himes
Discrete (off/on) output inductive proximity sensors are used in a multitude of markets and industries. The number of inductive sensors sold each year is in the millions. With that many pieces being sold each year, one has to ask – how are all of these sensors being used? Their uses break down into 3 common applications.
The 3 most common applications for discrete inductive proximity sensors are:
1.) Machine position verification
2.) Part position verification
3.) Part feature verification
In my recent travels of the east coast from Boston to Tampa, customers have been looking for quality solutions to be able to run:
and multiple sizes,
and multiple form-factors,
all on one production line.
Two things about this seem to be in every application:
- Change-over needs to be simple for the operators.
- Management needs to see the cost/time savings, be it planned or unplanned downtime.
But how can I do multiple recipes or multiple jobs on one machine? I have to reprogram/reposition sensors, move guide rails, swap out components, etc…
Written by: Bjoern Schaefer
Capacitive sensors certainly serve a niche within the group of proximity sensors. This niche makes people overlook the most striking feature this technology provides us – remote detection of any liquid through glass or plastic walls. On the first look that does not sound too exciting and I agree, as long as you have not been tasked to specify a sensor to accomplish this very job.
Increasingly, flexible manufacturing systems are being employed to allow the same equipment to produce a variety of different products, depending on demand. The key to the economic success of these systems is keeping changeover time to a minimum. Short changeover times mean more average production per hour and a smaller economical lot size. The time spent changing over a machine is part of what is called planned downtime. Planned downtime, if left unmanaged, can become a real sap on overall productivity.
Photoelectric sensors have solved numerous industrial applications over the years. There are basically three different sensing modes. The first is diffuse or reflex mode, next is retro reflective, which requires a reflector, and the third is through beam, transmitted or opposed. These field devices provide an excellent means of detecting target at a distance without contacting the object. All of the sensing modes are based on the sensor’s ability to detect a change in light reaching the sensor’s receiver. In this posting, we will review the diffuse or reflex photoelectric sensor.
Typical IP67 network topologies involve stand-alone I/O modules, providing 8 to 16 points of I/O per module. In some applications multiple stand-alone modules could be mounted within inches of each other. Thus was introduced the IP67 Network I/O Island, a modular IP67 I/O solution that allowed 8 to 60 plus I/O points to be connected to only one network node. This solution provided initial costs savings by reducing the number of network nodes used in an application, but brought along some new problems. One problem involved exceeding long sensor /actuator cordsets, with a centralized I/O solution remote sensors needed cordsets of 5, 10, or even 15 plus meters in length. The second issue was cordset management; imagine tracing a suspect cordset to the network I/O island with 60 plus connectors hanging off of the front of the unit.