Experimental Physics and
Industrial Control System

Jörn Dreyer via Tech-talk <[email protected]> · Mon, 01 Jul 2019 13:45:18 +0200

Hi Torsten,

some time ago I was thinking about writing an EPICS driver based on asyn and 
libADS from Beckhoff. But that got stalled due to other more urgent projects .

For me that would also make sense, as you can thencan  talk to a PLC program 
running on an BX or CX Controller. Otherwise you need to implement some 
communication method in your PLC program, resulting in additional license fees 
for the corresponding TwinCAT module.

Regards
Jörn

Am Montag, 1. Juli 2019, 13:01:43 CEST schrieb Torsten Bögershausen via Tech-
talk:
> Hej Hinko,
> 
> the short answer: No.
> 
> The longer answer:
> The BK9000 is part of a series of terminals that are from the
> pre-EtherCAT time.
> Still useful, still in use, terminals are named EKxxxx.
> 
> What ESS is heading for is EtherCAT as a standard, and that does
> exclude the BK9000.
> 
> The general question is, why do you (or anybody else) want to use the
> BK9000 together with EtherCAT sustems (the ELxxxx terminals)
> 
> So in theory the ECMC can be enhanced to talk to the BK900.
> but we don't see a use case for this.
> (And feel free and invited to visit us in the motion lab).
> 
> Another question; If somebody want to  use ADS (instead of modbus)
> to connect the EPICS IOC with the Beckhoff world, please let me know.
> 
> /Torsten
> 
> On 01/07/19 11:30, Hinko Kocevar via Tech-talk wrote:
> > Hi Han,
> > 
> > would the asyn driver that ESS has work with the coupler in subject -
> > BK9000?
> > 
> > Thanks,
> > //hinko
> > ________________________________________
> > From: [email protected] <[email protected]> on
> > behalf of Jeong Han Lee via Tech-talk <[email protected]> Sent:
> > Sunday, June 30, 2019 4:26:26 PM
> > To: Dunning, Michael; [email protected]
> > Subject: Re: [EXTERNAL] Beckhoff BK9000 support survey
> > 
> > Hi Mike,
> > 
> >     ESS has a bit unique and generic EPICS support based on asyn. Please
> > 
> > look at the following talk
> > 
> > http://accelconf.web.cern.ch/AccelConf/icalepcs2017/talks/mocpl05_talk.pdf
> > 
> >     We've called it as ecmc (EtherCat Motion Control), but we extend it
> > 
> > to generic I/O supports. The current support modules in the enclosed file.
> > 
> >     Unfortunately, they are within the closed repository, but we are
> > 
> > willing to share it within EPICS community.
> > 
> >     HTH,
> >     Han
> > 
> > On 6/27/19 5:38 PM, Dunning, Michael via Tech-talk wrote:
> >> Thanks everybody for the responses so far.
> >> 
> >> I should add that, as Davide mentioned, for some modules we need to
> >> access the Beckhoff "hidden" registers which can only be accessed
> >> through other registers.  This makes the modbus "driver" approach
> >> necessary if we want to cover all modules.  In our case we've needed
> >> to access these registers for changing configuration parameters, e.g.
> >> changing thermocouple types or ADC scaling, or for motor
> >> configuration.
> >> 
> >> Mark - thanks for pointing out the new C++ version of modbus.  It
> >> sounds like we could get rid of our custom modbus driver code and
> >> instead call modbus functions directly from our asynPortDriver.  This
> >> should simplify things and make maintenance a bit easier.  This
> >> definitely sounds like something we should pursue.
> >> 
> >> Thanks again to all who have responded.
> >> 
> >> Mike
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Michael Dunning
> >> SLAC National Accelerator Laboratory
> >> 2575 Sand Hill Road
> >> Menlo Park, CA 94025
> >> (650) 926-5200
> >> 
> >> On Thu, Jun 27, 2019 at 11:52 AM Mark Rivers <[email protected]> 
wrote:
> >>>> I would only do this if the application is complex enough that you need
> >>>> to move logic from the database down into C++ code. I'd still make use
> >>>> of the standard modbus support module and use it like a library to
> >>>> handle the modbus protocol (since it's been around for 10+ years and
> >>>> is well tested, that would be my starting point>>> 
> >>> In the new asynPortDriver branch you can do the following:
> >>>           drvAsynIPPortConfigure("Koyo1","camaro:502",0,0,1);
> >>>           asynSetOption("Koyo1", 0, "disconnectOnReadTimeout", "Y");
> >>>           
> >>>           
> >>>           
> >>>           modbusInterposeConfig("Koyo1", modbusLinkTCP, 5000, 0);
> >>>           
> >>>           
> >>>           
> >>>           // Use absolute addressing, modbusStartAddress=-1.
> >>>           drvModbusAsyn *pModbus = new drvModbusAsyn("K1", "Koyo1", 0,
> >>>           2, -1, 256, dataTypeUInt16, 0, "Koyo");
> >>>           
> >>>           // Write 10 bits at address 2048
> >>>           memset(data, 0, sizeof(data));
> >>>           data[0] = 1;
> >>>           data[2] = 1;
> >>>           data[4] = 1;
> >>>           data[6] = 1;
> >>>           data[8] = 1;
> >>>           printf(" Writing [1 0 1 0 1 0 1 0 1 0] to adddress 2048\n");
> >>>           /* asynStatus doModbusIO(int slave, int function, int start,
> >>>           epicsUInt16 *data, int len); */ pModbus->doModbusIO(0,
> >>>           MODBUS_WRITE_MULTIPLE_COILS, 2048, data, 10);
> >>>           
> >>>           
> >>>           
> >>>           Because the drvModbusAsyn constructor was called with
> >>>           startAddress=-1 doModbusIO can write to any address with any
> >>>           function code.>>> 
> >>> Mark
> >>> 
> >>> Sent from my iPhone
> >>> 
> >>> On Jun 27, 2019, at 12:23 PM, Pearson, Matthew R. via Tech-talk
> >>> <[email protected]<mailto:[email protected]>> wrote:
> >>> 
> >>> Hi,
> >>> 
> >>> 
> >>> 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.
> >>> 
> >>> 
> >>> If the only problem with this method is the code duplication in each IOC
> >>> then it's best to move the database into templates in a support module.
> >>> Then all the IOC has to do is include them in a substitutions file. You
> >>> could have one template per module type. And if there is common
> >>> database code between modules then separate that out into common
> >>> template files that are included in the per-module templates.
> >>> 
> >>> Then in the IOC startup script you may have a large list of calls to
> >>> drvModbusAsynConfigure in order to setup the modbus ports for different
> >>> address ranges. You can also put this in the support module, and just
> >>> include it in the IOC st.cmd, passing in macros as necessary. For
> >>> example, this is what I do for one of my applications for the Moxa
> >>> ioLogik modules:
> >>> 
> >>> #E1214 Unit (6 DI and 6 Relay)
> >>> epicsEnvSet("IP_ADDR","192.168.200.177:502")
> >>> epicsEnvSet("IP_PORT","m1ip")
> >>> epicsEnvSet("PORT","m1")
> >>> < $(MOXA)/st_scripts/st_common.cmd
> >>> 
> >>> Where st_common.cmd is just a list of calls to drvModbusAsynConfigure.
> >>> You may or may not need a different list for each type of module,
> >>> depending on the modbus registry maps.
> >>> 
> >>> 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.
> >>> 
> >>> I would only do this if the application is complex enough that you need
> >>> to move logic from the database down into C++ code. I'd still make use
> >>> of the standard modbus support module and use it like a library to
> >>> handle the modbus protocol (since it's been around for 10+ years and is
> >>> well tested, that would be my starting point).
> >>> 
> >>> 
> >>> 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.
> >>> 
> >>> 
> >>> There's no need to write support this way anymore, since Asyn gives you
> >>> the device support for free.
> >>> 
> >>> Cheers,
> >>> Matt

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System