Merge pull request #1289 from jozamudi/new-vfv-device

Added new VCN_OpenLoop device class

docs/source/upcoming_release_notes/848-create_new_VCNOpenLoop_device_class.rst

@@ -0,0 +1,32 @@
+848 create new VCN_OpenLoop device class
+#################
+
+API Breaks
+----------
+- N/A
+
+Library Features
+----------------
+- N/A
+
+Device Features
+---------------
+- N/A
+
+New Devices
+-----------
+- VCN_OpenLoop: similar to VCN w/ the removal of 'open' and 'position_readback'
+  commands. The 'state' member variable has been renamed to 'control_mode' and
+  the associated doc string was been updated.
+
+Bugfixes
+--------
+- N/A
+
+Maintenance
+-----------
+- N/A
+
+Contributors
+------------
+- jozamudi

pcdsdevices/valve.py

@@ -858,3 +858,43 @@ class VCN_VAT590(BaseInterface, Device):
     )
 
     status = Cpt(VCN_VAT590_Status, '',)
+
+
+class VCN_OpenLoop(Device):
+    """
+    VCN = Variable Controlled Needle
+
+    VCN w/ open loop control
+    It corresponds to ST_VCN in the lcls-twincat-vacuum library.
+    """
+    position_control = Cpt(
+        EpicsSignalWithRBV,
+        ':POS_REQ',
+        kind='normal',
+        doc=('requested positition to control the valve '
+             '0-100%')
+    )
+    upper_limit = Cpt(
+        EpicsSignalWithRBV,
+        ':Limit',
+        kind='normal',
+        doc=('max upper limit position to open the valve '
+             '0-100%')
+    )
+    interlock_ok = Cpt(
+        EpicsSignalRO,
+        ':ILK_OK_RBV',
+        kind='normal',
+        doc='interlock ok status'
+    )
+    control_mode = Cpt(
+        EpicsSignalWithRBV,
+        ':STATE',
+        kind='normal',
+        doc='Open mode will open valve to upper limit'
+    )
+    pos_ao = Cpt(
+        EpicsSignalRO,
+        ':POS_AO_R_RBV',
+        kind='normal'
+    )