diff --git a/site_ansto/instrument/bilby/config/anticollider/acscript.txt b/site_ansto/instrument/bilby/config/anticollider/acscript.txt
index e69de29b..1ae4bbce 100644
--- a/site_ansto/instrument/bilby/config/anticollider/acscript.txt
+++ b/site_ansto/instrument/bilby/config/anticollider/acscript.txt
@@ -0,0 +1,5 @@
+# Forbid detector motion when the detector voltage is on
+forbid {-inf inf} for det    when dhv1 in {56 inf}
+forbid {-inf inf} for curtaindet when dhv1 in {56 inf}
+forbid {-inf inf} for det    when dhv2 in {56 inf}
+forbid {-inf inf} for curtaindet when dhv2 in {56 inf}