2002-08-21 EPICS Seminar at IHEP 1
Some Experiences on Choosing Standards at
KEK
KEKB Controls Group
2002-08-21by Tadahiko Katoh
Control Systems at KEK
- KEK PS Control System- TRISTAN Control System- Renewed KEK PS Control System- KEKB Control System
Standard used in PS Control System
- System Design started in 1972- Standards adopted- RS-232C
- Proprietary Systems- Network- Process Input/Output
Standards used in TRISTAN Control System
- Design started in 1981- Standards used- CAMAC Serial Highway(IEEE 596)- CAMAC Dataway(IEEE 483)- GPIB(IEEE 488)- MIL-1553B- RS-232C
- Proprietary System- Computer Network
Standards used in Second Generation PS Control System
- Renewal started in 1985- VMEbus(IEEE 1014)- Direct I/Os on VMEbus
- MAP(IEEE 801.4)- Broadband Token-Bus Network- CATV and Computer Network on one Coaxial
Cable
- GPIB(IEEE 488)- RS-232C
Standards in KEKB Control System
- Design Started 1993- VMEbus(IEEE 1014)- CAMAC(IEEE 596)- CAMAC(IEEE 483)- GPIB(IEEE 488)- FDDI- Ethernet(IEEE 801.2, 801.11)- 10 Base/T --> 100 Base/TX --> GbE
Life of the Accelerators
- KEK PS 30 years- TRISTAN 10 years- KEKB 10 - 20 years
Life of the Control Systems
- Electronic Equipment 10 - 20 years
- Consumer Electronics 7 years- Electronic Components10 - 20 years- IC’s(Supply) 20 years- Electrolytic Capacitors 10 years- Connectors
- VME Modules 10 years- Semiconductor Manufact. 5 years
Results of the Standards
- CAMAC(IEEE 483, IEEE 596)- Very simple and clear standard- Still widely used over the world- But careful design of the modules are req
uired- Parts especially SSI or MSI are obsolete
- VMEbus(IEEE 1014)- Very widely used- Will not be replaced by Compact PCI bus
Results of the Standard(2)
- MAP(IEEE 801.4)- Highly dependent on the automobile
industry(General Motors)- No second source of modules
- FDDI- It was a smart network standard- Expensive interface as ATM- Going to be obsolete in a few years- Replaced by Switched Ethernet
Results of the Standard(3)- GPIB(IEEE 488)- Widely used in Measuring Equipment- Optical Interface- Ethernet Interface- Behavior of the equipment is not always unpredi
ctable- Ethernet(IEEE 801.2, 801.11)- High Speed: 100 Base, Gb, 10 GbE- Wireless: 801.11a, 801.11b
- RS-232C, RS-485, RS-422/423- Physical Layer
How to Choose a Standard- Wait a little until the standard is widely
used.- A good standard is not always used
widely.- Don’t believe what a manufacturer
announces.- Check a module carefully before you
decide to use.- A manufacturer will never be your side
even if you are a good customer.
Standards that may be used Now
- Ethernet(IEEE 801.2, 801.11)- GbE, 100 Base/TX, 10 Base/T
- GPIB(IEEE 488)- You may use a GPIB equipment if it satisfi
es your requirements. Use with Ethernet.- CAMAC(IEEE 483, 596)- If you have already have CAMAC modules
- VME(IEEE 1014), VME64
Thank you for your attention!