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LCLS Vacuum Controls Database PV Attributes

Table 1.0 provides the format of the EPICS PV name. Table 1.1 lists the Vacuum Primaries used for LCLS. Table 1.2 lists the most commonly used EPICS PV attibutes.

Vacuum Device Name Examples

Table 1.0

EPICS Device

<Device Type>:<Area>:<Position>:<Attribute>

Vacuum Device Types

Table 1.1

Device Type

Description

VVPG

Pneumatic (remotely controlled) gate valve

VVMG

Manual gate valve

VPIO

Ion pump

VGCC

Cold cathode gauge

VGPR

Pirani gauge

VGHF

Hot filament gauge

VGCP

Convectron gauge

Vacuum Attributes

Table 1.2

Device Type

Attribute

Description

VVPG or VVMG

POSITION

Valve position. Options: Open, Closed, Moving, Inconsistent

VPIO

P

Pressure (Torr)

VPIO

V

Pump voltage (Volts)

VPIO

I

Pump current (Amps)

VPIO

PSTAT1

Pressure status relative to process set point 1. Options: OK, Faulted

VPIO

PSTAT2

Pressure status relative to process set point 2. Options: OK, Faulted

VGCC, VGPR, VGHF, or VGCP

P

Pressure (Torr)

VGCC, VGPR, VGHF, or VGCP

PSTAT

Pressure status relative to process set point. Options: OK, Faulted

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