diff --git a/site_ansto/instrument/util/genmotconf.tcl b/site_ansto/instrument/util/genmotconf.tcl
index eb9d8193..6dad4fa9 100755
--- a/site_ansto/instrument/util/genmotconf.tcl
+++ b/site_ansto/instrument/util/genmotconf.tcl
@@ -75,6 +75,31 @@ set fhe [open ${scriptname}_errors.log "w"]
 # @param att attribute name
 # @return value for attribute or NOATT if no attribute should be generated.
 proc gen_attval {mot att} {
+
+  if {[set ::${mot}_attarr(steps_per_x)] < 0} {
+    set sign -1.0
+  } else {
+    set sign 1.0
+  }
+  if { [info exists ::${mot}_encatts(cnts_per_x)] } {
+    set cnts_per_x_val [expr double([set ::${mot}_encatts(cnts_per_x)])]
+  }
+  if { [info exists ::${mot}_encatts(rev_enc_lim)]} {
+    set rev_enc_lim_val [expr double([set ::${mot}_encatts(rev_enc_lim)])]
+  }
+  if { [info exists ::${mot}_encatts(fwd_enc_lim)]} {
+    set fwd_enc_lim_val [expr double([set ::${mot}_encatts(fwd_enc_lim)])]
+  }
+  if [info exists ::${mot}_attarr(absenchome)] {
+    set enc_home_val [expr double([set ::${mot}_attarr(absenchome)])]
+  } else {
+    set enc_home_val [expr double([set ::${mot}_encatts(rev_enc_lim)])]
+  }
+  if [info exists ::${mot}_attarr(home)] {
+    set home_val [expr double([set ::${mot}_attarr(home)])]
+  } else {
+    set home_val 0
+  }
   switch $att {
     "absenchome" {
       if [info exists ::${mot}_encatts(rev_enc_lim)] {
@@ -86,24 +111,17 @@ proc gen_attval {mot att} {
     "maxspeed" {return 1}
     "maxaccel" {return 1}
     "maxdecel" {return 1}
-    "rev_lim" {return 0}
+    "rev_lim" {
+      if { [info exists ::${mot}_encatts(rev_enc_lim)] && [info exists ::${mot}_encatts(cnts_per_x)] } {
+        return [expr {$sign * ($rev_enc_lim_val - $enc_home_val) / $cnts_per_x_val + $home_val}]
+      } else {
+        return 0
+      }
+    }
     "home" {return 0}
     "fwd_lim" {
       if { [info exists ::${mot}_encatts(fwd_enc_lim)] && [info exists ::${mot}_encatts(cnts_per_x)] } {
-        set fwd_enc_lim_val [set ::${mot}_encatts(fwd_enc_lim)]
-        set cnts_per_x_val [set ::${mot}_encatts(cnts_per_x)]
-
-        if [info exists ::${mot}_encatts(rev_enc_lim)] {
-          set rev_enc_lim_val [set ::${mot}_encatts(rev_enc_lim)]
-        } else {
-          set rev_enc_lim_val 0
-        }
-        if [info exists ::${mot}_encatts(home)] {
-          set home_val [set ::${mot}_encatts(home)]
-        } else {
-          set home_val 0
-        }
-        return [expr {($fwd_enc_lim_val - $rev_enc_lim_val) / $cnts_per_x_val + $home_val}]
+        return [expr {$sign * ($fwd_enc_lim_val - $enc_home_val) / $cnts_per_x_val + $home_val}]
       } else {
         return 1
       }