Merge pull request #1312 from ZLLentz/fix_mmc100_sig

FIX: override velocity_base in MMC100, it doesn't have one

docs/source/upcoming_release_notes/1312-fix_mmc100_sig.rst

@@ -0,0 +1,34 @@
+1312 fix_mmc100_sig
+###################
+
+API Breaks
+----------
+- N/A
+
+Library Features
+----------------
+- N/A
+
+Device Features
+---------------
+- N/A
+
+New Devices
+-----------
+- N/A
+
+Bugfixes
+--------
+- Replace the ``velocity_base`` (``.VBAS``) signal in the `MMC100` class
+  with a base `Signal` to avoid a PV disconnected error
+  that was preventing moves.
+  The `MMC100` record does not have this field.
+  With this fix, `MMC100` devices can move again.
+
+Maintenance
+-----------
+- N/A
+
+Contributors
+------------
+- zllentz

pcdsdevices/epics_motor.py

@@ -1235,6 +1235,8 @@ class MMC100(PCDSMotorBase):
     home_forward = Cpt(EpicsSignal, '.MLP', kind='omitted')
     home_reverse = Cpt(EpicsSignal, '.MLN', kind='omitted')
 
+    velocity_base = Cpt(Signal, kind='omitted')
+
 
 class BeckhoffAxisPLC(Device):
     """