PVSS allows to monitor and control the entire Powering Interlock System. It gathers information from all powering interlock controllers and monitors relevant information such as the powering status for each individual superconducting circuit in the LHC. The architecture of the SCADA system is shown below. More additional information about PIC-PVSS can be found here.

- To open the PIC supervision, you will need to be on a computer connected to the Technical Network and open the CCM console. Then click on HWC ->PIC Supervision as shown below:

- The main screen represents an overview of the status of all 36 Powering Interlock Controllers in the LHC accelerator complex. By clicking on the square box of a specific PIC a detailed view of such PIC will be opened. In addition, we have a global view of masked interlocks, sector access, electrical circuits locking or last post-mortem trigger.

• CIP MASKED INFO: It contains information about the mask status of CRYOGENICS, QPS, UPS, AUG or configuration checks.
• POST MORTEM INFO: It indicates the last time that the PIC was involved in a beam dump request.
• CIRCUITS INFO: It keeps a track of the list of circuits which are locked and that cannot be powered.
• PP60A: It provides the status of the Power_Permit 60A in all sectors.
• SECTOR ACCESS: It shows the status of SECTOR_ACCESS signals which limit the  current below 1kA to allow for short access

- Each box in the layout diagram describes a single PIC and can be represented with the following symbol and colour convention

- The history buffer of the PIC can be launched from the overview screen. From this window we can retrieve the logs of the controllers within a specified time window and applying different filter options.

- The I/O status tab shows the I/O status of the selected controller:

• Unmaskable User_Permit to BIS: Status of the USER_PERMIT sent to the Beam Interlock System (BIS) when a powering failure is detected in at least one of the circuits considered as essential for beam operation.
• Maskable User_Permit to BIS: Status of the USER_PERMIT sent to the BIS when a powering failure is detected in at least one of the circuits considered as auxiliary for beam operation.
• Powering Subsector OFF: Status of the global powering subsector abort.
• Slow Power Abort: Status of the global slow power abort.

- The powering tab shows information about conditions for powering:

• AUG OK: Software signal which represents the status of the AUG sytem.
• UPS OK: Software signal which represents the status of the UPS system.
• CRYO START: Software signal representing the status of the CRYO and required before starting powering. If CRYO_START signal is lost during operation, powering will continue normally.
• CRYO MAINTAIN: Signal representing the status of the CRYO. This signal arrives to the PIC via PLC to PLC communication and in case of losing it, a slow power abort will be initiated in the powering subsector.
• CONFIGURATION DATA: Signal that detects inconsistencies in the configuration data of the PLC against PVSS.

- The monitoring tab displays information about status of power supplies, cabling connections, anybus modules...

• Local Power Supplies: It represents the status of all power supplies in the PIC.
• Cable Connect Signals: It shows whether all expected cables arriving to the patch panels of the PIC are connected.
• AUG – UPS: It shows the status of the hardware signal arriving from the AUG and UPS systems to the BIC.
• ANYBUS Monitoring: It shows the status of the ANYBUS modules which interface the remote I/O and the PLC via PROFIBUS.
• CPLD Monitoring: It gives back the data addressed by CPLD addressing.
• CRYO MAINTAIN: It shows the status of the communication with the CRYO PLC.
• CIBU Interfaces: It shows the status of the USER_PERMIT of the essential and auxiliary circuits to the BIC.

- The params tab shows relevant information related to global protection mechanisms and criticality of the electrical circuits.

• Pow Sub OFF: It represents the list of circuits which can trigger a Powering Subsector Abort.
• PIC_UNM: List of circuits essential for operation and linked to the UNMASKABLE inputs of the Beam Interlock System.
• PIC_MSK: List of circuits non-essential for operation and linked to the MASKABLE inputs of the Beam Interlock System.