user interface to the beam interlock system - AB-BDI-BL
Contents
1. 18 9 USER REQUIREMENTS KEREWCRERR M FEE 19 5 1 POWERING THE GIBU intem 19 5 2 USER SYSTEM TEST ON DEMAND eoriadur aaa tuba 19 5 3 USER SYSTEM SPECIFICATIONS OF INTERCONNECTION 19 5 4 EMC COMPLIANCE OF INTERCONNECTION 19 5 4 1 THE INTERCONNECTING CABLE 0ccceccececececcecceceeucceccceececeaceneeeersesseceeeereeseeeanes 20 B2 CONNECTOR ibis tiep ue eased SUE A NAI En 20 B4 3 WHEEARTHING a A 20 5 5 RECOMMENDED INTERCONNECT p d Ub NE dO x URP ER Bd 21 LHC Project Document No AB CO Note 06 XX 1 4 Tech Page 4 of 22 List of Figures Figure 1 Simplified Internal Architecture of the LHC Beam Interlock System 8 Figure 2 Simplified Internal Architecture of the SPS Beam Interlock System 9 Figure 3 Simplified Architecture of SPS Extraction and Transfer Lines Interlock System 10 Figure 4 Simplified Internal Architecture of the LHC Injection Interlock system 11 Figure 5 Rear View and Front View of the CIBU type 0 13 Figure 6 Rear View and Front View of the CIBU type S 0 132. 6 1 4 STRUCTURE OF THIS DOCUMENT E Ex Med Ia 6 2 THE ROLE OF THE USER INTERFACE i iesuesscunssazsseuaEzscana ERE SEE ER RR secede 7 2 1 INTERLOCKING THE EFC asvseneiustoniuumi oi nxE YE ne DUI TI bati ecd 7 2 2 INTERLOCKING THE SPSRLIING i boxed bd eto RC V dcn Ced Pw a corona om e Cp 9 2 3 INTERLOCKING THE SPS EXTRACTION AND TRANSFER LINES 10 2 4 INTERLOCKING THE LCAC INJEGCTIODN 2212 2 MANUEL ND NICA 11 3 DESCRIPTION OF THE USER CONNECTION ssssnssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 12 3 1 THE DIFFERENT TYPES OF USER SYSTEMS FEY ER RC CENE VOR EE 12 3 2 HARDWARE INTERFACE SUPPLIED TO THE USER SYSTEMS 12 svp A bata ICD EM 13 32 2 13 EN EMIL cok m T 14 4 ELECTRONIC INTERFACE REQUIRED WITH THE USER SYSTEMS 15 4 1 GIVING USER PESE p a wea eine s wie aane d ra 15 4 2 READING BEAM INFO anil eect x RD ui a C RED DD PEU ds 16 4 3 PINOLOGY OF USER CONNECTOR 17 4 4 USER SYTEM TO BIS INPUT OUTPUT SPECIFICATIONS 18 4 4 1 GUARANTEED INPUT SPECIFICATIONS 18 4 4 2 GUARANTEED OUTPUT SPECIFICATIONS
3. ERROR CIBUS Front View All the LEDs are on the front pannel Figure 6 Rear View and Front View of the CIBU type S The socket genders are noted on the two Figures on this page LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 14 of 22 Figure 7 CIBUD Rear View When viewed from the rear the Beam 2 sockets are on the left hand side Beam 1 on the right 3 2 3 THE CIBU LEDS Various CIBU Light Emitting Diodes are visible on the front panel The important LEDs to note are those representing USER PERMIT A USER PERMIT B and BEAM INFO These are Tri Colour LEDs having the functions shown in the following diagram Red gt USER PERMIT FALSE Green gt USER PERMIT TRUE BN BEAM INTERLOCK USER INTERFACE USER PERMIT A USER PERMIT B BEAM INFO RX Red gt USER PERMIT FALSE Status of Serial Link Green gt USER PERMIT TRUE Communication with BIC Orange gt Channel in Test Mode Figure 8 CIBU Tri Colour Light Emitting Diode Function LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 15 of 22 4 ELECTRONIC INTERFACE REQUIRED WITH THE USER SYSTEMS 4 1 GIVING USER PERMIT As the safety and reliability requirements of the BIS are strict there are many rules to follow concerning the interface to the User System The redundant USER PERMIT signals A and are generated two separate current loops fr
4. by ex Ya acl e 15 Table 8 Function of the Output Transistor for BEAM 1 emen 16 Table 9 Component List for Pe KERN 16 Table 10 PInology of CIBU VIAE S 17 CIBU INDUCE specifications si Hoa tid d dcn Mb baa e P oe Ron d hd pb 18 Japle 12 CIBU Output SDecilICdtHlOliSssszzocoxorE RE DUAVERUVEPROStARPASEREDUKHDU PERDERE RE E PSDCE EDS 18 LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 5 of 22 1 OVERVIEW 1 1 INTRODUCTION The Beam Interlock System BIS was originally conceived and designed for providing a fast reliable and dependable mechanism for safe operation of the accelerator During the design development it was always foreseen that the BIS would be capable of providing a robust modular solution for any other Beam Interlock System required by CERN The BIS is expected to be deployed in four distinct yet related environments 1 TheLHC ring 2 The SPS ring 3 The SPS Extraction channels and Transfer Lines 1554 40 TT41 amp 18 and LSS6 TT60 amp TI2 4 The LHC Injection In all four cases the same hardware is used to connect any User System to the Beam Interlock System Therefore a unique User Interface CIBU is provided fulfilling all the requirements of any of the thr
5. BEAM PERMIT inputs are required from the User System labelled as USER PERMIT A and USER PERMIT ideally these two links should connect to two completely isolated pieces of hardware in the User System It has to be noted that joining the redundant links together creates a single mode failure in the interconnection circumventing all BIS redundancy and thus having a huge impact on LHC safety Explicit justification is needed for any User System that will not provide a redundant USER PERMIT signal to the BIS 1 4 STRUCTURE OF THIS DOCUMENT The Beam Interlock System consists of identical modular hardware however the end function carried out differs according to the scenario in which it is used This document begins by briefly describing the functions and differences of each of the four main applications of the BIS The role of the User Interface for LHC Interlock is described in section 2 1 SPS Interlock is described in section 2 2 SPS Extraction Interlock is described in section 2 3 LHC Injection Interlock is described in section 2 4 Section 3 describes the CIBU function showing diagrams with connector and LED locations Section 4 specifies the electronic interface required by the User System with its requirements and implementation Section 5 details other user requirements and the document concludes with complete diagrams of the preferred implementation of the interface LHC Project Document No AB CO
6. CIBUS LHC Injection Connection BEAM_PERMIT A LHC Injection BEAM_PERMIT B Enable Figure 4 Simplified Internal Architecture of the LHC Injection Interlock system The LHC Injection BIS is composed of only one Beam Interlock Controller BIC installed in each LHC injection region SR2 and SR8 Each controller performs the logical AND of USER_PERMIT signals from the locally connected User Systems As a result when any USER_PERMIT is FALSE the corresponding LHC Beam Injection is blocked LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 12 of 22 3 DESCRIPTION OF THE USER CONNECTION To maintain the safety requirements of the Beam Interlock System the method of connection of User Systems is very particular Effort has been made to create a simple reliable and versatile input structure taking into consideration the variety amongst equipments and the times of response required by the whole system 3 1 THE DIFFERENT TYPES OF USER SYSTEMS There are many different types of hardware platform that will be connected directly to the BIS equipment ranges from standard VME based approaches through Compact PCI operating with TTL logic at around 5V to PLC based systems where the common output voltage is 24V or a current loop Overall the User Systems can be generalised into the following two categories _ Operating Voltage Speed Of Response Permit Change Main Hardware Ti Volts r
7. Cable NE 8 04 21 52 1150 LS 3 XX ACEITES re c Permit B e a u a k V 4k lt Beam Info Shown Above Connection for Beam 1 Both Beam Interlock Figure 13 Recommended User interconnect for CIBUS and for CIBUD Beam 1 LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 22 of 22 The following diagram Figure 14 is used for CIBUD Beam 2 connection It will be used in a very small number of cases where Independent Beam Interlock Users operate on LHC Beam 2 The type differs only very slightly in the gender of the connectors on the CIBUD ET c 20 E 1 Q i L LLI 0 0 a pL a Ex FD c 3 LW m 5 5 n CIBU Ir User System c nput Cable NE 8 SCEM 04 21 52 115 0 Permit E NE eom info Shown Above Connection for Beam 2 Interlock Figure 14 Recommended interconnect for CIBUD Beam 2 N B The CIBU socket of a Beam 1 Both Beam User Connection is FEMALE The CIBU socket of a Beam 2 User Connection is MALE For the SPS CNGS and Transfer Line applications User Systems should prepare a cable which ends in a Burndy 8 MALE plug as shown in Figure 13
8. SPS Beam User Systems are User System is available unavailable Table 2 USER PERMIT and BEAM INFO Descriptions for SPS The SPS BIS has a simplified architecture but the same safety level as the LHC BIS A single connected system is shown in the drawing below Beam Interlock System Beam Interlock Controller USER PERMIT USER PERMIT BEAM_INFO SPS Beam ic Connection Beam Dump SPS Beam Figure 2 Simplified Internal Architecture of the SPS Beam Interlock System The SPS BIS is composed of 6 Beam Interlock Controllers BICs one installed in each BA building Each controller performs the logical AND of USER_PERMIT signals from the locally connected User Systems This is exactly the same hardware as the other Beam Interlock Systems simply without the Beam 2 modules as SPS has only one Beam As a result the function of the SPS BIS is identical to the LHC BIS when any USER_PERMIT is removed the Beam Dump is fired and the Beam is extracted LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 10 of 22 2 3 INTERLOCKING THE SPS EXTRACTION AND TRANSFER LINES The role of the SPS Extraction Lines BIS is to enable beam extraction when all of the Extraction Line systems are ready SPS Extraction is blocked if at least one system is not available The same system is used for both SPS Extraction zones The BIS managing the SPS Extraction and Transfer Lines is based on a different architectu
9. The User connects to the BIS twice once for each Beam This connection is made in the same CIBUD but via a separate cable with a different gender connector and socket 2 redundant SUNRISE NEL js ie oe Power Supplies Ac eam Interlock System E FROM TO FROM FROM TO USER e USER CIBUD Rear View Burndy 8 Male Bumdy 8 Female for User System for User System connection Beam 2 connection Beam 1 BEAM INTERLOCK USER INTERFACE PSUA VCC e e BEAM 1 BEAM 2 USER PERMIT A USER PERMIT A USER PERMIT B USER PERMIT B GEAM INFO BEAM INFO RK RE ERROR on ERROR CIBUD Front View the LEDs are on the front pannel Figure 5 Rear View and Front View of the CIBU type D 3 2 2 THE CIBUS The CIBU type S i e CIBUS is used for SPS ring for LHC Injection and for Extraction and Transfer Lines between SPS and LHC CNGS In all cases there is only one beam The CIBUS is also used in the LHC for those Users that are interlocking Beam 1 and Beam 2 simultaneously The User connects once with a Both Beam link In case of USER PERMIT FALSE both beams would be extracted Burndy 12 Female for 2 redundant Beam Interlock Satem connection Power Supplies ar e FROM TO USER CIBUS Rear View Burndy 8 Female for User System connection BEAM INTERLOCK USER INTERFACE VCC PSUB LJ e USER PERMIT A USER PERMIT BEAM INFO RX
10. Document No AB CO Note 06 XX 1 4 Tech CE RN AB D E PA CERN Div Group Supplier Contractor Document No CH 1211 Geneva 23 AB CO MI Switzerland EDMS Document No Date 16 OCTOBER 2006 TECHNICAL NOTE USER INTERFACE TO THE BEAM INTERLOCK SYSTEM Abstract This note describes the functionality and the requirements of any User System s connection to the Beam Interlock System via the User Interface this connection is critical for machine safety and must be implemented in a very specific manner to provide safe and reliable interlocking The same unit is provided for all of the different applications of the Beam Interlock System LHC ring LHC injection SPS ring and SPS Extraction amp Transfer Lines Written by B Todd AB CO A Dinius AB PO B Puccio AB CO LHC Project Document No AB CO Note 06 XX 1 4 Tech Page 2 of 22 History of Changes Rev No Date Pages Description of Changes 1 4 17 10 2006 All Re Release LHC Project Document No AB CO Note 06 XX 1 4 Tech Page 3 of 22 Table of Contents 1 OVERVIEW 5 1 1 INTRODUCTION rented en eria oda Uc naro medie YR AX CIAR Ma etd 5 1 2 PURPOSE OF THIS DOCUMENT i UE MEET e ELE Sb tsi as 12 REFERENCES EET AT 5 1 3 AN IMPORTANT NOTE ABOUT
11. Figure zc IBUD Reale VIO Woo oie Jee eae Mcd OU eae PL E ICM I IE DDR EK IA 14 Figure 8 CIBU Tri Colour Light Emitting Diode Function 14 Figure 9 Current Loop Tor USER PERMIT 155 vsucos vd rue Peak Ka sd Ra Ern Ex CE VERA E ew 15 Figure T0 Optocouple rTor BEAM INEO pater ot S NS E cA RU NS DEP nian ca aw UE OR ROPA GbR ORC DI d 16 Figure GIBU Input Circuit Bd Sa vta did aa eg eb o E exa as 17 Figure 12 Principle of Interconnection for Complete EMC 19 Figure 13 Recommended User interconnect for CIBUS and for CIBUD Beamc 1 21 Figure 14 Recommended interconnect for CIBUD 2 nnn 22 List of Tables Table 1 USER PERMIT and BEAM INFO Descriptions for 7 Table 2 USER PERMIT and BEAM INFO Descriptions for 5 9 Table 3 USER PERMIT and BEAM INFO Descriptions for SPS Extraction Lines 10 Table 4 USER PERMIT and BEAM INFO Descriptions for LHC 11 Table 5 Basie TYDES Of USEF orbes nU iacu eon ara ed mee nara teenage 12 Table 6 Function of the Input Current Loops for USER PERMIT 15 Table 7 Component List Tor USER PERMIT s icis x aint raa aba EE
12. Note 06 XX 1v4 Tech Page 7 of 22 2 THE ROLE OF THE USER INTERFACE 2 1 INTERLOCKING THE LHC The aim of the Beam Interlock System is to generate BEAM PERMIT signals for the two circulating LHC Beams When BEAM PERMIT is TRUE The related beam is allowed to circulate When BEAM PERMIT is FALSE A beam dump is requested when BEAM PERMIT changes to FALSE More information is given in the dedicated engineering specification 1 In LHC the role of the CIBU is to take the two USER PERMIT signals and transmit them to the nearest Beam Interlock Controller in a safe and reliable manner In return the Users receive a BEAM INFO giving an indication of the availability of the whole LHC machine for beam operation Two different families of User System are connected to the BIS 1 Those interlocking Beam 1 and Beam 2 independently User connects twice with Beam 1 and Beam 2 via a CIBUD see 3 2 1 2 Those interlocking Beam 1 and Beam 2 simultaneously User connects once with Both Beam via a CIBUS see 3 2 2 CIBU type amp USER PERMIT BEAM INFO User Connection TRUE FALSE Beam operation NOT permitted OR All required Beam 1 User dump request Systems are available for Beam 1 Beam operation NOT permitted OR All required Beam 2 User dump request Systems are available for Beam 2 1 allowed to circulate At least one required Beam 1 User System is unavailable CIBUD Beam 1 Beam 2 allowed to circul
13. and Transfer Lines Interlock System The BIS managing the SPS Extraction and Transfer Lines is using the same hardware as all other Beam Interlock Systems LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 11 of 22 2 4 INTERLOCKING THE LHC INJECTION For the LHC Injection zones the Beam Interlock System generates a single BEAM PERMIT signal When BEAM PERMIT is TRUE LHC injection is permitted When BEAM PERMIT is FALSE LHC Injection is blocked More information is given in the dedicated engineering specification 3 The CIBU transmits the USER PERMIT signals in a reliable and safe manner to the nearest Beam Interlock Controller to produce the INJECTION BEAM PERMIT signal In return it provides Users with the BEAM INFO giving an indication of the availability of the injection operation USER PERMIT BEAM INFO CIBU Type TRUE FALSE TRUE FALSE LHC Injection is LHC Injection is below allowed NOT allowed Table 4 USER PERMIT and BEAM INFO Descriptions for LHC Injection The LHC Injection BIS has same safety level as the LHC BIS the Injection BIS gives a windowed BEAM PERMIT with long periods of BEAM PERMIT FALSE followed by millisecond bursts of BEAM PERMIT TRUE when injection is being made For these reasons BEAM INFO has little real meaning in the injection controllers It is maintained only for compatibility Beam Interlock System Beam Interlock Controller
14. ate At least one required Beam 2 User System is unavailable CIBUD Beam 2 At least one required Beam 1 AND At least one required Beam 2 User System is unavailable Beam 1 amp Beam operation All required User Systems CIBUS Beam 2 NOT permitted OR for Beam 1 OR Both Beam allowed to dump request Beam 2 operation are circulate for Beam 1 amp Beam 2 available Table 1 USER PERMIT and BEAM INFO Descriptions for LHC N B The safety requirements of the BIS dictate the internal architecture for the transmission of information from the User System to the LHC Beam Dumping System This action meets at least SIL 3 of the IEC 61508 standard However it must be noted that the BEAM INFO signal provided by the CIBU has no such safety requirement LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 8 of 22 Beam Interlock Controller I USER PERMIT A USER PERMIT BEAM1 INFO USER PERMIT A USER PERMIT BEAM1 INFO USER PERMIT USER PERMIT A USER PERMITE BEAM NFO Both Beam Connection i Z BEAM1 PERMIT Beam Dump BEAM1 PERMIT 1 t T n ELE JN gt Z gt QJ gt D BEAM2 PERMIT Beam Dump BEAM2 PERMIT 2 Figure 1 Simplified Internal Architecture of the LHC Beam Interlock System BEAM2 INFO USER PERMIT A USER PERMIT BEAM2 INFO USER PERMIT A USER PERMIT The role of the CIBU is simply to tran
15. ct the input of the circuit These activate when the line voltage is outside of the range 33V Circuit USER PERMIT B is identical i No tolerance is given for the current level it is resulated by a transistor pair LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 16 of 22 4 2 READING BEAM INFO The BEAM INFO is returned to the User in the form of an optocoupler which is driven by _ BEAM INFO Transistor Status Boolean the CIBU TRUE beam is allowed to circulate FALSE beam is NOT allowed to circulate Table 8 Function of the Output Transistor for BEAM INFO Beam Info D 2 Component 5 Mane Value Type 33V Bi TVS 4 33V 618 5 Beam nfo D Table 9 Component List for BEAM_INFO 4 Figure 10 Optocoupler for BEAM_INFO When the CIBU allows current to flow in the optocoupler the transistor is activated giving an indication to the user of the status of the Beam Permit within the BIS The failure modes of this circuit mean that this signal cannot be used for safety critical operations If a User wants to be sure that no beam circulates in the LHC the USER_PERMIT must be set to FALSE This circuit is also protected by Transient Voltage Suppressor Diodes that activate when the signal exceeds 33V LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 17 of 22 4 3 PINOLOGY OF CIBU SOCKETS The socket on the User Inte
16. ee implementations The main priority in the development of the Beam Interlock System has been safety it will respond when requested to with a very high level of safety in fact the BIS meets the IEC 61508 Safety Integrity Level 3 SIL 3 that is to say the chances of the Beam Interlock System failing and not being able to respond to a User request are less than 10 h The CIBU is intended to be installed in the User System s rack giving a safe and reliable connection from User to BIS which is independent of User hardware and of distance from User to BIS Rack 1 2 PURPOSE OF THIS DOCUMENT The purpose of this document is to provide a detailed description of the interconnection from User System to BIS in any of the three environments listed above However it must also be understood that this document is only a technical note complementing other engineering specifications 1 2 3 and 4 describing in detail the functionality and implementation of the BIS 1 2 1 REFERENCES 1 The Beam Interlock System Engineering Specification LHC CIB ES 0001 00 10 EDMS Document No 567256 This document describes the functionality architecture and performance requirements of the Beam Interlock System In addition it defines the interfaces of the LHC BIS with the other systems Any equipment interconnected to the BIS with the purpose of interlocking is designated a User System Following LHC naming convention this hardware is des
17. elative PLC System VME System Table 5 Basic Types of User System The input circuit of the User Interface accommodates these systems with the same interface 3 2 HARDWARE INTERFACE SUPPLIED TO THE USER SYSTEMS The User Interface CI BU hardware is provided to all Users who need to connect to any Beam Interlock System It consists of a 19 rack mounted board having a height of 2U It will be mounted at the front of the Users Rack with all electrical connections made at the rear of the CIBU panel only status LEDs are visible from the front The CIBU variants completely serve all different types of User LHC ring LHC Injection SPS ring and SPS Extraction Lines Therefore the User Interface is available under 2 versions e CIBUS single connection for interlocking a single Beam or Both Beam e CIBUD double connections for interlocking Beam 1 Beam 2 Note The CIBUD and the CIBUS use exactly the same internal hardware As the CIBUS has single connection it has simply half of the components the Beam 2 part is not assembled In both cases the CIBU contains fully redundant power supplies and the hardware within the panel can be tested and monitored at distance LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 13 of 22 3 2 1 THE CIBUD The CIBU type D i e CIBUD is only used in the LHC It permits to connect LHC User System that is interlocking Beam 1 and Beam 2 independently
18. ignated as CIBU Controls Interlocks Beam User The CIBU is available in 2 versions CIBUS single type for one beam connection and CIBUD double type for beaml beam2 connections LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 6 of 22 2 The Beam Interlock System Realisation Engineering Specification in preparation Describing the LHC BIS implementation explaining the design and realisation of the different hardware parts that compose the BIS also covering the reliability safety availability and maintainability of the LHC BIS 3 The SPS Beam Interlock System Engineering Specification in preparation Describing the purpose and architecture of the SPS BIS its functions its interfaces with other systems and its implementation based on the LHC BIS 4 Interlocking between SPS CNGS LHC transfer lines and LHC injection Engineering Specification LHC CI ES 0002 EDMS Document No 602470 Describing the SPS Extraction Lines BIS layout discussing the implementation based on the LHC BIS Also lists the expected Extraction Line Users 1 3 AN IMPORTANT NOTE ABOUT REDUNDANCY To meet the stringent SIL 3 requirements and for CERN s accelerator complex to be suitably protected against beam related damage the Beam Interlock System is completely redundant This redundancy is performed using 2 separated channels named A and from User System through to the Kicker systems It is for this reason that two separate
19. kets within a distance of approximately 1 5m of the rear of the CIBU for the redundant Power Supply Units 5 2 USER SYSTEM TEST ON DEMAND For the commissioning installation and cold check out of the CIBU the User System must also be able to change the state of USER PERMIT A and USER PERMIT from TRUE to FALSE on demand This will verify the complete link from User System to BIS The reverse transition should not be possible via any form of test mode i e Users should not be able to force both USER PERMIT TRUE if their system is not ready for beam operation In order to facilitate testing of the entire interlock chain Users are permitted to set USER PERMIT A TRUE but only when USER PERMIT B is guaranteed to be FALSE Note that upon entering a Test Mode User Systems should toggle USER PERMIT A and USER PERMIT B to FALSE to guarantee that the machine is without beam 5 3 USER SYSTEM SPECIFICATIONS OF INTERCONNECTION The interconnection also dictates some of User System parameters Firstly the User System must be capable of sourcing 80mA to drive the input stages of the USER PERMIT signals and the BEAM INFO Users should take care to restrict the current that can flow through the USER PERMIT lines as a connector fault could drive one of these signals to ground during installation Secondly the User should take care to add Transient Voltage Suppressors in the signal lines as transient voltage
20. o USER PERMIT min I i I 24 I Table 11 CIBU Input Specifications Maximum current from USER PERMIT to for USER PERMIT TRUE Value 33 V 25V 3 V 5V 5000 V us 9 mA e 15mA 1mA 10 2 us SIL 3 The current in the input stage is internally regulated by the CIBU the guaranteed values of current are shown in the table above Note that a digital filter is applied to the USER PERMIT signal removing 215 of state change from TRUE to FALSE A Note for PLC Users 1 The dV dt maximum means the use of mechanical relays for driving the input circuits should be avoided 2 Applying a reverse voltage of 24V to the input circuit for example swapping pins 3 and 4 by accident will damage the CIBU 4 4 2 GUARANTEED OUTPUT SPECIFICATIONS Name Description ate _ Aton Maximum time for BEAM_INFO to change to TRUE from FALSE Maximum time for BEAM_INFO to change to FALSE from TRUE Combined Safety of BEAM_INFO Table 12 CIBU Output Specifications Note that BEAM_INFO does not meet ANY of the Safety Integrity Levels of the IEC 61508 it should be used for information only and in no case must BEAM_INFO be solely used to influence either USER_PERMIT signal Through optocoupler I V 18000 will also flow through LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 19 of 22 5 USER REQUIREMENTS 5 1 POWERING THE CIBU The User must provide two 230V mains supply soc
21. om the User System for each of the two current loops the following applies Input Loop Current USER PERMIT mA Boolean FALSE user DOES NOT give permission for beam TRUE user gives permission for beam Table 6 Function of the Input Current Loops for USER PERMIT Note that between the values of 1 and 9 milliamps the value of USER PERMIT is either TRUE or FALSE depending on the age of the installed equipment A newer optocoupler will react to lower levels of current whereas an ageing device will have a higher threshold of current Essentially USER PERMIT is guaranteed FALSE when the current is less than one milliamp it is guaranteed TRUE when the current is greater than nine milliamps User Permit A E R IC Name 3 4 847 Pzrm22 HCPL 2601 Table 7 Component List for USER PERMIT Figure 9 Current Loop for USER PERMIT The User System needs to provide sufficient voltage across USER PERMIT A and USER PERMIT A Around 12mA will be drawn through the optocoupler this is regulated by the transistor in conjunction with R4 which turns off T when the voltage drop across is too high R3 forces the optocoupler off in low current situations as the optocoupler requires around 1 2V across its diode before switching R ensures that floating inputs cannot cause USER PERMIT to change value Note also that a pair of Transient Voltage Suppressors 0 and is used to prote
22. r possible a treatment such as alodine should be applied to make the metalwork more conductive Note that standard front panels are NOT conductive The shield of the cable should be connected 360 around the connector surrounding all the signal wires completely pig tail connections for the shield are expressly forbidden 5 4 3 THE EARTHING The shield of the cable should be electrically connected to the chassis which itself should form a protective box around the user equipment The chassis should be connected to Earth with the shortest stubs possible and in many places The electronic ground of the User System should also be joined to Earth in many places with short stubs Internal connections are provided that link the ground of the Beam Interlock System with the User System The electrical grounds of the Beam Interlock System and the User System should be connected together in all circumstances LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 21 of 22 5 5 RECOMMENDED INTERCONNECT The interconnection from User System to CIBU should ideally be as shown in the following diagrams change the Beam Status 4k79 pull up to suit if desired The following diagram Figure 13 is recommended for e for Both Beam Single Beam connection CIBUS for Beam 1 connection CIBUD gt EE D So 0 o 9 8 n LL gt to 6 2 gt 2 ctl os User System a CIBU Input
23. re than the others Several slave BICs each interlocking a transfer line or part of one Connected to One Master BIC receiving the signal from the slave BICs and generating a PERMIT signal for the dedicated Extraction Kicker system When BEAM PERMIT is TRUE SPS Extraction is permitted When BEAM PERMIT is FALSE SPS Extraction is not permitted More information is given in the dedicated engineering specification 4 The Role of the CIBU in this case is to safely and reliably transmit the USER PERMIT information to the nearest slave Beam Interlock Controller USER PERMIT BEAM INFO CIBU Type TRUE FALSE TRUE FALSE SPS Extraction is SPS Extraction is See note below See note below allowed NOT allowed Table 3 USER PERMIT and BEAM INFO Descriptions for SPS Extraction Lines Note The SPS Extraction Line BIS is based on hierarchy and its function is based on a windowed approach with long periods of BEAM PERMIT FALSE followed by millisecond bursts of BEAM PERMIT TRUE when extraction is being made For these reasons BEAM INFO is maintained in the SPS Extraction and Transfer Lines solely for hardware compatibility reasons Beam Interlock System Beam Interlock Controller a4 CIBUS SPS Extraction Connection BEAM PERMIT A SPS Extraction Enable BEAM PERMIT Figure 3 Simplified Architecture of SPS Extraction
24. rface CI BU for the connection from to the User System is a Burndy 8 Pin UTOZ The pinology of the socket is shown in the table directly below with the schematic on the right CIBU Input Schematic Name EMC improvement GND by ground proximity EMC improvement GND by ground proximity Current Loop for User Permit A USER PERMIT A Current Loop for L Tf B User Permit B 4 SM pa USER PERMIT B Current Loop for I Beam Info aridis i collector HE Beam Info emitter GND EMC improvement by enclosure Table 10 Pinology of CIBU User Connection Figure 11 CIBU Input Circuit Schematic For the CIBUS the above socket is always a Burndy 8 Pin female For the CIBUD it s either a Burndy 8 Pin female Beam 1 or Burndy 8 Pin male Beam 2 This is intentional so that User Systems capable of dumping the LHC beams individually cannot misconnect the Beam 1 and Beam 2 signals LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 18 of 22 4 4 USER SYTEM TO BIS INPUT OUTPUT SPECIFICATIONS The circuit on the previous page shows the complete interface care must be taken not to exceed the specification of any of the components used in particular the optocouplers for the user permit signals 4 4 1 GUARANTEED INPUT SPECIFICATIONS Name Description Maximum voltage allowed on a single USER PERMIT or line Maximum Voltage allowed from USER PERMIT t
25. smit the USER PERMIT signals to the nearest Beam Interlock Controller in a safe and reliable manner the redundant channels are labelled as A and in the diagram Connections to the LHC Injection System are not shown for simplicity The LHC BIS is made from 16 Beam Interlock Controllers BI Cs distributed around LHC Each one performs the logical AND of USER PERMIT signals from the connected User Systems A very simplified version with only three connected systems is shown above the BIC is able to connect with many more LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 9 of 22 2 2 INTERLOCKING THE SPS RING In the SPS the Beam Interlock System generates a single BEAM PERMIT signal When BEAM PERMIT is TRUE SPS Beam is allowed to circulate SPS injection is permitted When BEAM PERMIT is FALSE An SPS beam dump is requested when BEAM PERMIT changes to FALSE More information is given in the dedicated engineering specification 3 The SPS CIBU transmits the USER PERMIT signals in a reliable and safe manner to the nearest Beam Interlock Controller to produce the SPS BEAM PERMIT signal In return it provides Users with the BEAM INFO giving an indication of the availability of the SPS ring for beam operation USER PERMIT BEAM INFO CIBU Type TRUE FALSE TRUE FALSE Beam operation SPS Beam NOT permitted allowed to OR circulate SPS Beam dump request All required At least one required SPS Beam
26. spikes could destroy unprotected User circuits 5 4 EMC COMPLIANCE OF INTERCONNECTION In order to avoid EMC problems the connection from CIBU to User System must be correctly implemented The connection is to be realised as follows Shielded amp Twisted Pair Beam XX Interlock System Electronics User oystem Electronics Figure 12 Principle of Interconnection for Complete EMC Compliance This constraint is NOT applicable for User Systems that are interlocking the Extraction lines LHC Project Document No AB CO Note 06 XX 1v4 Tech Page 20 of 22 5 4 1 THE INTERCONNECTING CABLE The interconnecting cable needs to be a shielded twisted pair NE 8 is a good example passing in a sensible route from User System to Beam Interlock System The cable should be stowed in cable racks if the distance to travel exceeds around 1m As a rule of thumb it should be no longer than 4m as the CIBU should be as close as practically possible to the User System Care should be taken not to allow the cable to run in parallel to power cables as they will interfere It should also be noted that the cable should not run in parallel to conductors carrying very low voltage signals as the cable can be a source of interference as well as a receptor 5 4 2 THE CONNECTORS Conductive metal connectors are needed which should mate with an electrically conductive chassis without anodisation Whereev
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