1. A Study of the Tracker DCS
Chung Khim Lae
Johns Hopkins University
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DCS Meeting

2. Outline Overview of the Tracker DCS
Compare their system design with ours
Summary
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DCS Meeting

3. How They Build Their System
Consolidate info into one Excel file
Excel tables are exported to Oracle
Run scripts to build PVSS, PLC from Oracle
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DCS Meeting

4. Excel Tables DetectorParts: Build FSM hierarchy
CAEN: A4602, A4603 cabling
TSSLogical: All PLC sensors
TSSLogical2PIW: Sensors to PLC channels
PLC_Connection: Addresses of PLC channels
Groups: Majority voting
PLCMasters: Alarm groups
TSSlogical_Group
TSSLogical2Masters
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DCS Meeting

5. More Tables… Relay_connection: Addresses of relays Relay2Crate
PLCDewpoints: Humidity, temperature, PLCMaster
HMX: Calibration constants
DCU, DCU_Smoothing, DCU_Masters
ColdestPoints: For dew point comparison
Coldest2PLCMasters
Board: Constants for the conditioning board
PC, PLC, rack numbers
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DCS Meeting

6. DetectorParts SubDet a b c d e f type level PCid panel CU 5 Root 1 10
Root 1 10
BigPart
Part 2 3 CG 4 PG
Parent_SubDet
P_a
P_b
P_c
P_d
P_e
P_f
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7. CAENCabling SubDet a b c d e f SY1572 BR crate board ch rack 10 1 2 55 3
X2F37
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8. Archive_Smooth_Procedure
TSSLogical
SubDet a b c d e f
type
no.
Good
FailEnable 10 1 RH
TAir T? 2
TLiq
TSil
HI_Thres
LO_Thres
HiAlEnable
LoAlEnable
Smooth_Procedure
TimeInterval
Deadband
Archive_Smooth_Procedure
TimeInterval
Deadband
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9. TSSLogical2PIW SubDet a b c d e f type no. PLCid typeID row slot ch
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10. name of conditioning board
PLC_Connection
PLCid
typeID
row
slot ch
DB400
DB600
Board_name
read address
write address
name of conditioning board
Major_Version
Minor_Version
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11. Groups PLCid GroupID sensor_count majority_count Major_Version
Minor_Version
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12. Archive_Smooth_Procedure
PLCMasters
SubDet a b c u1 u2 u3 u4 l1 l2 l3 l4
majority
Archive_Smooth_Procedure
TimeInterval
Deadband
OFF u4
ERROR u3
WARNING u2
PRE-WARNING u1 OK l1
PRE-WARNING l2
WARNING l3
ERROR l4
OFF
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DCS Meeting

13. Relay PLCid row slot ch relayID DB404 DB604 read address write address
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14. Relay2Crate row slot ch SY1527 BR crate rack normal Good FailEnable
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15. PLCDewpoints SubDet a b c d ColdestPointsID min of Pixel Barrel+
Hum_SubDet a b c d e f
type
no.
Temp_SubDet a b c d e f
type
no.
Master_SubDet a b c d e f
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16. HMX
SubDet a b c d e f
type
no. H0 H1 H2
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17. DCU
SubDet a b c d e f
DetID
DCUid
Cable
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18. From Oracle to PVSS 1 1 4 2 3
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19. From Oracle to PVSS 2 2 1
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20. From Oracle to PVSS 3
Wait for 30 min…
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21. Datapoint Types
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22. DEN
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23. FSM
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24. 29/11/2018
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25. 29/11/2018
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26. 29/11/2018
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27. 29/11/2018
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28. 29/11/2018
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29. 29/11/2018
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30. Strip vs. Pixel PLC (dew point, addressing) Hierarchy
For Strip, hierarchy shows detector view: TIB → End → Layer → CL → Control Ring → String
For Pixel, hierarchy shows detector + hardware views: Pixel → Cooling, CAEN, Siemens (missing in Strip) Pixel → Barrel → Shell → … → ROC
Strip FSM is sparse to save memory—device units are power groups (A4603)
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DCS Meeting

31. Other Differences Pixel temperature readings (Siemens, FEC, FED)
Power up, power down procedures
State conditions (LVMIXED, HVMIXED)
Panels, Names (integers vs. strings) etc.
Majority voting
Alarm groups
Coldest point (Not in Pixel)
DCU tables, XDAQ interface
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DCS Meeting

32. Tracker’s Experience
FSM has a large overhead; minimise the number of nodes; implement only what is necessary
XDAQ is slow; minimise the communication between PVSS and XDAQ
Talk to Framework people (Oliver Holme)
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DCS Meeting

33. Summary Tracker has a well-tested DCS that works right out-of-the-box
We can use their tools to build a DCS for Pixel by filling up the Excel tables
But the system will be different from our current design
29/11/2018
DCS Meeting