1. 16 - Nov. 2000EPICS Workshop Oak Ridge1 Epics to TINE translator Matthias Clausen, DESY Hamburg Phil Duval, DESY Hamburg Zoltan Kakucs, DESY Hamburg

2. 16 - Nov. 2000EPICS Workshop Oak Ridge2 Contents Accelerator Controls at DESY History of creating EPICS to TINE translator Naming convention Mode of operation Conclusions, summary and future

3. 16 - Nov. 2000EPICS Workshop Oak Ridge3 Accelerator Controls at DESY Past –hampered by the “many- control-systems” syndrome –different subsystems controlled by completely different means –no possibility of intercommunication (HERA) Today –practically all subsystems of HERA are controlled by TINE or at least talking TINE –important exceptions include: Proton Vacuum cryogenics control ( D/3 and EPICS) the super conducting electron RF cavities the utility subsystems (EPICS)

4. 16 - Nov. 2000EPICS Workshop Oak Ridge4 EPICS data to TINE in the past Most of the TINE applications are written in Visual basic One generic component of the TINE environment is ACOP, an Active-X control ACOP (Accelerator Component Object Programming) library; ACOP has the CA –DLL bulit in Not all programmers use ACOP to develop their applications

5. 16 - Nov. 2000EPICS Workshop Oak Ridge5 “Old way” ca-client ACOP Application ca-server VME crate OS: vxWorks Appl: EPICS UNIX or WindowsNT TINE client CA function

6. 16 - Nov. 2000EPICS Workshop Oak Ridge6 Disadvantages of using “old way“ Update of distributed CA libraries and DLL-s No naming service available No easy way to integrate EPICS IOC‘s into TINE applications –Alarms, trends... Low priority clients consume (CA) resources in critical machines

7. 16 - Nov. 2000EPICS Workshop Oak Ridge7 First Ideas Integrate the EPICS IOC-s into the HERA mainstream Build new server which runs directly on the EPICS IOC The server module resides in each of the IOC‘s along with the local EPICS namespace Autoconfiguration of the TINE server during system startup (after IOC_init) Control via channel access remains as before Use well implemented local calls like dbpf, dbgf Additional “mapped” record list EPICS TINE can be configured

8. 16 - Nov. 2000EPICS Workshop Oak Ridge8 Requirements Excellent performance without disturbing the real-time control loops in the IOC A maximum level of flexibility Less additional programming Fit seamlessly into TINE applications (Alarm, Archive, Naming, Permit, …)

9. 16 - Nov. 2000EPICS Workshop Oak Ridge9 Configuration PC Windows NT VBA Applic TINE I/O Controller vxWorks EPICS CA Server Field I/O Sun Solaris MEDM CA Field I/O I/O Controller vxWorks EPICS CA Server TINE Server PC Windows NT X-Session CA

10. 16 - Nov. 2000EPICS Workshop Oak Ridge10 IOC DATABASE database access library device drivers Channel Access client C program SNL sequence record support device support database library Channel Access server TINE server Channel Access Client user program WORKSTATION Channel Access Repeater TINE Client user program WINDOWS NT

11. 16 - Nov. 2000EPICS Workshop Oak Ridge11 Naming convention (EPICS-CA) Database is the heart of an IOC (records) Unique record names across all IOC-s attached to the same TCP/IP subnet. Form: [. ] Each record type has a fixed set of fields: common / specific Access to the database is via the channel or database access routines

12. 16 - Nov. 2000EPICS Workshop Oak Ridge12 Naming convention (Gateway) Each server module has a mapped record list –the real PV names are mapped to TINE registered names –EPICS record names 28 chars, field 4 chars field –TINE device names 16 chars, properties 32 chars Record names are registered as TINE devices Register devices with their truncated TINE names: –List of PV’s can be associated with TINE names –Dynamically Need to truncate !!!!

13. 16 - Nov. 2000EPICS Workshop Oak Ridge13 Extended support for different data types Data type conversions are performed in the server Using EPICS CA standard data types defined in db_access.h like DBR_STRING, _DOUBLE, _FLOAT, _LONG, _CHAR Converting of different data types was possible without major changes in EPICS or TINE code

14. 16 - Nov. 2000EPICS Workshop Oak Ridge14 More... New requirements were identified Additional set of PV’s ( all temperatures of the dipoles...) Set of arranged TINE devices Identified through collective names Configuration files, contains the composite names and the members of each composite device User can set up his own sets Easily scaleable

15. 16 - Nov. 2000EPICS Workshop Oak Ridge15 Summary and Future First tests >>> monitor 250 channels in one IOC Weather station data transparent to several TINE clients Possibility to communicate to the EPICS IOC’s through: CA protocol and “TINE-Way” Integrate existing EPICS systems without rebooting –TINE server can be loaded and started at any time –Restarting of the TINE-Server without booting the system Integrate the EPICS IOC‘s into TINE control system

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18. 16 - Nov. 2000EPICS Workshop Oak Ridge18 Conclusions The ‚dual face‘ IOC can be reliably implemented The integration of EPICS IOC‘s into other control systems can be implemented on the IOC itself Auto configuration – or configuration files – helps to unbundle the IOC database from ‚the other‘ server Existing data conversion routines can be used Using EPICS specific memory allocation routines in the code of the ‚the other‘ server helps to achieve stable operation Channel access ‚limitations‘ like name server and broadcast barriers can be avoided this way