diff --git a/cfg/sim_uniax.cfg b/cfg/sim_uniax.cfg
index 27ee782..fc7c0e3 100644
--- a/cfg/sim_uniax.cfg
+++ b/cfg/sim_uniax.cfg
@@ -7,7 +7,7 @@ uri=tcp://5000
 
 [drv]
 class = secop.simulation.SimDrivable
-extra_params = speed
+extra_params = speed, safe_current, safe_step, maxcurrent
 description = simulated motor
 value.default = 0
 speed.readonly = False
diff --git a/secop_psi/simdpm.py b/secop_psi/simdpm.py
index 00ff28b..b6fb768 100644
--- a/secop_psi/simdpm.py
+++ b/secop_psi/simdpm.py
@@ -32,6 +32,7 @@ class DPM3(Readable):
     hysteresis = Parameter('simulated hysteresis', FloatRange(unit='deg'), default=100, readonly=False)
     friction = Parameter('friction', FloatRange(unit='N/deg'), default=1, readonly=False)
     slope = Parameter('slope', FloatRange(unit='N/deg'), default=10, readonly=False)
+    offset = Parameter('offset', FloatRange(unit='N'), default=0, readonly=False)
 
     _pos = 0  # effective piston position, main hysteresis taken into account