pcdsdevices.valve.VGC_2S

class pcdsdevices.valve.VGC_2S(prefix='', *, name, kind=None, read_attrs=None, configuration_attrs=None, parent=None, **kwargs)

Class for Controlled Gate Valves with 2 setpoints.

Ophyd Device Components

Attribute	Class	Suffix	Docs	Kind	Notes
open_command	EpicsSignalWithRBV	:OPN_SW	Epics command to Open valve	normal	Inherited from VGC
interlock_ok	EpicsSignalRO	:OPN_OK_RBV	Valve is OK to Open interlock	normal	Inherited from VGC
open_do	EpicsSignalRO	:OPN_DO_RBV	PLC Output to Open valve, 1 means 24V on command cable	normal	Inherited from VGC
error_reset	EpicsSignalWithRBV	:ALM_RST	Reset Error state to valid by toggling this	normal	Inherited from VGC
override_status	EpicsSignalRO	:OVRD_ON_RBV	Epics Readback on Override mode	omitted	Inherited from VGC
override_force_open	EpicsSignalWithRBV	:FORCE_OPN	Epics Command to force open the valve inoverride mode	omitted	Inherited from VGC
state	EpicsSignalRO	:STATE_RBV	Valve state	normal	Inherited from VGC
open_limit	EpicsSignalRO	:OPN_DI_RBV	Open limit switch digital input	hinted	Inherited from VGC
closed_limit	EpicsSignalRO	:CLS_DI_RBV	Closed limit switch digital input	hinted	Inherited from VGC
diff_press_ok	EpicsSignalRO	:DP_OK_RBV	Differential pressure interlock ok	normal	Inherited from VGC
ext_ilk_ok	EpicsSignalRO	:EXT_ILK_OK_RBV	External interlock ok	normal	Inherited from VGC
at_vac_setpoint	EpicsSignalWithRBV	:AT_VAC_SP	AT VAC Set point value	config	Inherited from VGC
setpoint_hysterisis	EpicsSignalWithRBV	:AT_VAC_HYS	AT VAC Hysterisis	config	Inherited from VGC
at_vac	EpicsSignalRO	:AT_VAC_RBV	at vacuum sp is reached	normal	Inherited from VGC
error	EpicsSignalRO	:ERROR_RBV	Error Present	normal	Inherited from VGC
mps_state	EpicsSignalRO	:MPS_FAULT_OK_RBV	individual valve MPS state for debugging	omitted	Inherited from VGC
interlock_device_upstream	EpicsSignalRO	:ILK_DEVICE_US_RBV	Upstream vacuum device used forinterlocking this valve	config	Inherited from VGC
interlock_device_downstream	EpicsSignalRO	:ILK_DEVICE_DS_RBV	Downstream vacuum device used forinterlocking this valve	config	Inherited from VGC
at_vac_setpoint_ds	EpicsSignalWithRBV	:AT_VAC_SP_DS	AT VAC Set point value for the downstream gauge	config
setpoint_hysterisis_ds	EpicsSignalWithRBV	:AT_VAC_HYS_DS	AT VAC Hysterisis for the downstream setpoint	config

Methods

configure(d: Dict[str, Any]) → Tuple[Dict[str, Any], Dict[str, Any]]

Configure the device for something during a run

This default implementation allows the user to change any of the configuration_attrs. Subclasses might override this to perform additional input validation, cleanup, etc.

Parameters

d (dict) – The configuration dictionary. To specify the order that the changes should be made, use an OrderedDict.

Returns

• (old, new) tuple of dictionaries

• Where old and new are pre- and post-configure configuration states.

describe() → ophyd.device.OrderedDictType[str, Dict[str, Any]]

Provide schema and meta-data for read().

This keys in the OrderedDict this method returns must match the keys in the OrderedDict return by read().

This provides schema related information, (ex shape, dtype), the source (ex PV name), and if available, units, limits, precision etc.

Returns

data_keys (OrderedDict) – The keys must be strings and the values must be dict-like with the event_model.event_descriptor.data_key schema.

get(**kwargs)

Get the value of all components in the device

Keyword arguments are passed onto each signal.get(). Components beginning with an underscore will not be included.

read() → ophyd.device.OrderedDictType[str, Dict[str, Any]]

Read data from the device.

This method is expected to be as instantaneous as possible, with any substantial acquisition time taken care of in trigger().

The OrderedDict returned by this method must have identical keys (in the same order) as the OrderedDict returned by describe().

By convention, the first key in the return is the ‘primary’ key and maybe used by heuristics in bluesky.

The values in the ordered dictionary must be dict (-likes) with the keys {'value', 'timestamp'}. The 'value' may have any type, the timestamp must be a float UNIX epoch timestamp in UTC.

Returns

data (OrderedDict) – The keys must be strings and the values must be dict-like with the keys {'value', 'timestamp'}

read_configuration() → ophyd.device.OrderedDictType[str, Dict[str, Any]]

Dictionary mapping names to value dicts with keys: value, timestamp

To control which fields are included, change the Component kinds on the device, or modify the configuration_attrs list.

stop(*, success=False)

Stop the Device and all (instantiated) subdevices

summary()

trigger() → ophyd.status.StatusBase

Trigger the device and return status object.

This method is responsible for implementing ‘trigger’ or ‘acquire’ functionality of this device.

If there is an appreciable time between triggering the device and it being able to be read (via the read() method) then this method is also responsible for arranging that the StatusBase object returned by this method is notified when the device is ready to be read.

If there is no delay between triggering and being readable, then this method must return a StatusBase object which is already completed.

Returns

status (StatusBase) – StatusBase object which will be marked as complete when the device is ready to be read.

Attributes

configuration_attrs

connected

hints

kind

lightpath_cpts = ['open_limit', 'closed_limit']

transmission