I am currently assisting a customer who is in need of a device that can accept two encoder signals and allow for selection between them for the output. While using relays or switches may be an option, the customer believes there is a specific device designed for this purpose. I have come across many encoder signal splitters, but have yet to find a multiplexer that fits the criteria. If anyone is familiar with a device that fits these specifications, please do share. Thank you.
To my knowledge, it is not possible to connect two encoders to a single PLC input. I consulted my former colleagues at Omron tech support and they confirmed that this is not a feasible solution. The reason behind this limitation is that even with a high-speed input, the PLC scan time required to differentiate between the two sets of pulses would result in a loss of pulses each time you switch between encoders. This would cause your position to become increasingly misaligned over time. As far as I am aware, each encoder must be connected to its own high-speed input to ensure accurate positioning.
I am in need of a device that allows me to easily switch between two encoders connected to the input. One encoder is preferred over the other depending on the situation. I believe I have found the ideal solution in the RIM Signal Switcher from Dynapar. While the connection diagram is not provided, the device appears to meet my requirements perfectly. More information can be found here: http://www.dynapar.com/uploadedFiles/Products/Heavy_Duty_Encoders/RIM_Signal_Switcher.pdf.
Apologies for the misunderstanding, it seemed like you were looking to connect both encoders to the PLC. Silly me, it's Wednesday and I'm eager to go home.
ndzied1 expressed interest in a device that would allow for switching between two encoders rather than having both attached simultaneously. This device could fulfill the need to alternate between encoder 1 and encoder 2. While a specific connection diagram was not provided, the product in question seems to align with the requirements. Upon closer inspection, it appears to contain three double pole changeover relays, a voltage regulator, and an opto isolator for the changeover signal. The "Fail Safe" feature of the device, particularly the normally closed relay contacts, is particularly appealing. Considering the components involved, it may be feasible to construct a similar unit oneself, with the use of gold plated relay contacts.
In order to create your own unit, consider using gold plated relay contacts which are easily available. A previous employer successfully used a Square D plug-in relay with gold contacts for an encoder selector set up. This setup was specifically used for switching processes during machine setup, not while in motion. It's a simple and effective solution that can be easily replicated.
It sounds like your customer might be in need of something like a dual-input encoder multiplexer. These devices can selectively choose between two input streams and output them as a single stream. Unfortunately, they aren't as ubiquitous as encoder splitters, which can make them trickier to locate. I'd suggest checking with manufacturers such as Broadcom or Renishaw, as they have quite a range of specialized encoder technologies. Keep in mind that the customer might need to consider customized solutions if their requirements are very specific.
It sounds like the customer might benefit from a digital multiplexer. They're designed to switch between different data sources and could possibly handle the encoder signals you're working with. Companies like Texas Instruments or Analog Devices have a wide catalogue of these products, and you can select based on the signal type (analog or digital), power requirements, and so on. Remember to examine the bandwidth constraints and ensure that the multiplexer can handle the frequency of the encoder signals.
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Answer: While encoder signal splitters are common, finding a multiplexer specifically designed for this purpose may require more specialized search.
Answer: Yes, relays or switches can be used as an alternative for selecting between two encoder signals, though they may not be as specialized as a dedicated multiplexer.
Answer: It may be helpful to seek recommendations from professionals in the field or consult with electronics manufacturers who specialize in signal processing devices.
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