Host Engineering Forum
General Category => Do-more CPUs and Do-more Designer Software => Topic started by: ATU on April 09, 2020, 09:33:18 AM
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Would the POM Ethernet module have less of an impact on the system overhead than the Ethernet native port? I am using multiple interrupts in an application and timing is ultra critical. I believe Bobo said that it was basically a serial module. I was thinking of changing to a serial port going to the HMI, but having the Ethernet connection is much cleaner and convenient.
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Would the POM Ethernet module have less of an impact on the system overhead than the Ethernet native port? I am using multiple interrupts in an application and timing is ultra critical. I believe Bobo said that it was basically a serial module. I was thinking of changing to a serial port going to the HMI, but having the Ethernet connection is much cleaner and convenient.
Yes, the ECOMLT is significantly lower load. The CPU to ECOMLT is a 1MB serial connection. Slower than the onboard, but more than adequate for programming and HMI.
We are actually considering creating a 2nd Ethernet POM that would be focused on master side comms. The ECOMLT is just a slave, so it can't do some of the master things that people would like. Mastering is a very different problem, but one that we can probably do with the right hardware.
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Thanks! I think having a 2nd more capable Ethernet port would be very useful, especially if your native port is working with time critical I/O
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Thanks! I think having a 2nd more capable Ethernet port would be very useful, especially if your native port is working with time critical I/O
We'll see what more capable means. It may just be different capabilities, but master side rather than slave. I would expect remote I/O master to be one of the possible new abilities.
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We are actually considering creating a 2nd Ethernet POM that would be focused on master side comms. The ECOMLT is just a slave, so it can't do some of the master things that people would like. Mastering is a very different problem, but one that we can probably do with the right hardware.
Ooh, that's going to be good for me! I have one application for using a BRX as a firewall & router to another BRX, and one port needs to email and be a Modbus slave and the other needs to master. No can do with the current POM.
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Ooh, that's going to be good for me! I have one application for using a BRX as a firewall & router to another BRX, and one port needs to email and be a Modbus slave and the other needs to master. No can do with the current POM.
ECOMLT has been a big help for redundant servers, but we've kinda struck out with some of the mastering functions. I am inclined to think single function mastering will be a slam dunk (like RIO), and minimal mastering ought to be good. By minimal, I mean a selected subset of masters. We'll see how robust that subset is. It might even not be a subset of available master functions as much as an upper limit on how many at once. Time will tell, but I like the odds.