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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Beckhoff BK9000 support survey |
| From: | Davide Marcato via Tech-talk <[email protected]> |
| To: | "Dunning, Michael" <[email protected]>, EPICS Tech-Talk <[email protected]> |
| Date: | Thu, 27 Jun 2019 09:41:17 +0200 |
Hello,at LNL-INFN (Italy) we are using the same beckhoff modules using the epics modbus module. This works well enough for us, but some modules have internal register that cannot be accessed directly (register communication). For this reason we developed a asynPortDriver interface to be able to access the internal registers of the KL2541 stepper motor module as part of the whole motor record support for that module.
We would be interested in any improved interface to these modules. Thank you, Davide On 27/06/19 2:17 AM, Dunning, Michael via Tech-talk wrote:
At SLAC we use Beckhoff bus terminals quite extensively because they are inexpensive and reliable, but unfortunately don't yet have a common epics support solution. We have at least three versions of support which were developed independently. One version uses only the epics modbus module. This has no driver so requires less maintenance, but makes setting up IOCs more time consuming and results in a lot of code duplication. Another version uses asynPortDriver and some custom modbus code. This is designed to make setting up IOCs easier, but requires maintenance of the driver code. Another uses custom epics device support. This requires writing device support for each bus terminal, and has resulted in a pretty ugly codebase. This is our least favored solution going forward. A typical installation would be a BK9000 bus coupler plus several analog and/or digital I/O modules (e.g. KL2114, KL1104, KL3172, KL3314), communicating over ethernet using Modbus TCP. Before we settle on a solution, we'd like to see what everyone else is doing. Any responses would be helpful. Thank you, Mike Michael Dunning SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 (650) 926-5200
-- Davide Marcato INFN - Laboratori Nazionali di Legnaro Viale dell'Universita', 2 35020 Legnaro (PD) - ITALY Phone: +39 0498068439 Mail: [email protected]