diff --git a/ophyd_devices/sim/sim_camera.py b/ophyd_devices/sim/sim_camera.py
index 22a5a6d..f682983 100644
--- a/ophyd_devices/sim/sim_camera.py
+++ b/ophyd_devices/sim/sim_camera.py
@@ -9,7 +9,6 @@ from ophyd_devices.interfaces.base_classes.psi_detector_base import (
     PSIDetectorBase,
 )
 from ophyd_devices.sim.sim_data import SimulatedDataCamera
-from ophyd_devices.sim.sim_exception import DeviceStop
 from ophyd_devices.sim.sim_signals import ReadOnlySignal, SetableSignal
 from ophyd_devices.sim.sim_utils import H5Writer
 
@@ -32,11 +31,9 @@ class SimCameraSetup(CustomDetectorMixin):
                 data = self.parent.image.get()
                 self.parent._run_subs(sub_type=self.parent.SUB_MONITOR, value=data)
                 if self.parent.stopped:
-                    raise DeviceStop
+                    break
                 if self.parent.write_to_disk.get():
                     self.parent.h5_writer.receive_data(data)
-        except DeviceStop:
-            pass
         finally:
             self.parent.stopped = False
 
diff --git a/ophyd_devices/sim/sim_exception.py b/ophyd_devices/sim/sim_exception.py
deleted file mode 100644
index dbf04ab..0000000
--- a/ophyd_devices/sim/sim_exception.py
+++ /dev/null
@@ -1,2 +0,0 @@
-class DeviceStop(Exception):
-    pass
diff --git a/ophyd_devices/sim/sim_positioner.py b/ophyd_devices/sim/sim_positioner.py
index eb2f03c..32c3ac4 100644
--- a/ophyd_devices/sim/sim_positioner.py
+++ b/ophyd_devices/sim/sim_positioner.py
@@ -9,7 +9,6 @@ from ophyd.utils import LimitError
 from typeguard import typechecked
 
 from ophyd_devices.sim.sim_data import SimulatedPositioner
-from ophyd_devices.sim.sim_exception import DeviceStop
 from ophyd_devices.sim.sim_signals import ReadOnlySignal, SetableSignal
 from ophyd_devices.sim.sim_test_devices import DummyController
 from ophyd_devices.sim.sim_utils import LinearTrajectory, stop_trajectory
@@ -143,8 +142,6 @@ class SimPositioner(Device, PositionerBase):
 
     def _update_state(self, val):
         """Update the state of the simulated device."""
-        if self._stopped:
-            raise DeviceStop
         old_readback = self._get_sim_state(self.readback.name)
         self._set_sim_state(self.readback.name, val)
 
@@ -160,22 +157,19 @@ class SimPositioner(Device, PositionerBase):
         """Move the simulated device and finish the motion."""
         success = True
 
+        target = stop_pos + self.tolerance.get() * np.random.uniform(-1, 1)
+
+        updates = np.ceil(np.abs(target - start_pos) / self.velocity.get() * self.update_frequency)
+
         try:
-            target = stop_pos + self.tolerance.get() * np.random.uniform(-1, 1)
-
-            updates = np.ceil(
-                np.abs(target - start_pos) / self.velocity.get() * self.update_frequency
-            )
-
             for ii in np.linspace(start_pos, target, int(updates)):
                 ttime.sleep(1 / self.update_frequency)
                 self._update_state(ii)
                 if self._stopped:
+                    success = False
                     break
             else:
                 self._update_state(target)
-        except DeviceStop:
-            success = False
         finally:
             self._done_moving(success=success)
             self._set_sim_state(self.motor_is_moving.name, 0)
@@ -238,6 +232,7 @@ class SimLinearTrajectoryPositioner(SimPositioner):
                 ttime.sleep(1 / self.update_frequency)
                 self._update_state(traj.position())
                 if self._stopped:
+                    success = False
                     break
             if self._stopped:
                 # simulate deceleration
@@ -246,8 +241,6 @@ class SimLinearTrajectoryPositioner(SimPositioner):
                     ttime.sleep(1 / self.update_frequency)
                     self._update_state(traj.position())
             self._update_state(traj.position())
-        except DeviceStop:
-            success = False
         finally:
             self._set_sim_state(self.motor_is_moving.name, 0)
             self._done_moving(success=success)
diff --git a/ophyd_devices/sim/sim_waveform.py b/ophyd_devices/sim/sim_waveform.py
index baa9a77..a859e50 100644
--- a/ophyd_devices/sim/sim_waveform.py
+++ b/ophyd_devices/sim/sim_waveform.py
@@ -7,7 +7,6 @@ from ophyd import Component as Cpt
 from ophyd import Device, DeviceStatus, Kind
 
 from ophyd_devices.sim.sim_data import SimulatedDataWaveform
-from ophyd_devices.sim.sim_exception import DeviceStop
 from ophyd_devices.sim.sim_signals import ReadOnlySignal, SetableSignal
 from ophyd_devices.utils.bec_scaninfo_mixin import BecScaninfoMixin
 
@@ -95,9 +94,7 @@ class SimWaveform(Device):
                 for _ in range(self.burst.get()):
                     self._run_subs(sub_type=self.SUB_MONITOR, value=self.waveform.get())
                     if self._stopped:
-                        raise DeviceStop
-            except DeviceStop:
-                pass
+                        break
             finally:
                 self._stopped = False
                 self._done_acquiring()