Greetings, friends! I am currently in the process of enhancing a system that utilizes an Omron incremental encoder (E6B2-CWZ6C) linked to a Danfoss VFD (FC360). However, I now need to transmit the same encoder signals for high-speed inputs on a CLP S7-1214. The encoder outputs are of the open collector type, and while it appears that connecting the inputs in parallel should pose no issues, I would like some confirmation. Has anyone faced a similar dilemma on this forum before? Thank you in advance for your insights!
There is a restriction on the number of devices that can be connected, although it is likely to exceed two. While encoder specifications may provide the maximum current for the encoder, determining the current draw for both the Danfoss and PLC inputs may pose a challenge. In my experience, I successfully connected one encoder to three PLC high-speed counter modules when necessary.
While Encoder Splitters like the Dynapar may come at a higher price point, their reliability and performance make them a worthwhile investment.
It is crucial for both devices to have a common ground (0V) for proper functionality. In my setup, I successfully share an encoder between two PLCs by ensuring they share a common ground. If the devices do not share a common ground, you can consider using an Encoder Splitter as recommended by Robert. Another option is to use opto-isolators to achieve the same outcome.
Hello everyone, Over the weekend, I had the opportunity to conduct a test when the production line was experiencing a shortage of product. I successfully connected the A/B/GND signals of the VFD input in parallel with the PLC inputs, and the results were positive. However, this was more of a proof of concept test and had its limitations. Initially, I considered using an encoder splitter, but during a field test, I found that the VFD has an available RS485 port. I am now conducting research to determine the protocols it supports. I greatly appreciate the valuable ideas shared by you all. Thank you for your input.
Hello! I've worked on a similar setup before. You're right that open collectors can generally be connected in parallel without any issues due to their high-impedance state when off. However, I'd advise you to ensure that you're not going beyond the total sinking or sourcing capabilities of the encoder. This could cause a voltage drop that may affect the signal's integrity. Additionally, remember to check the input voltage rating of the CLP S7-1214 to prevent any potential overvoltage condition. Just a head's up based on past experiences!
Hi there! I've worked with a similar setup before. While in theory you should be able to parallel your outputs without an issue given the open collector, you should also consider the potential loading effects on your encoder's outputs. It's crucial to verify that your encoder can handle the summed input current of your VFD and CLP. Alternatively, you might want to think about using a signal amplifier or splitter to ensure signal integrity. Always better to be safe than sorry in these situations!
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Answer: - Yes, you can connect the encoder outputs in parallel to multiple devices like a Danfoss VFD and a CLP S7-1214 for high-speed inputs.
Answer: - As long as the devices can accept the open collector type outputs of the encoder, connecting them in parallel should not pose any issues.
Answer: - You can ask for insights and experiences from the forum members who may have encountered a similar dilemma in connecting an Omron encoder to multiple devices.
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