diff --git a/99-Shared/adsis8300bcm/diff_m.bob b/99-Shared/adsis8300bcm/diff_m.bob
index 7b3c4b5b2409cf25fa12e4a97904ce2c98cb7818..7177a58c998f25bae0d70fdf382145941d373b5a 100644
--- a/99-Shared/adsis8300bcm/diff_m.bob
+++ b/99-Shared/adsis8300bcm/diff_m.bob
@@ -17,10 +17,9 @@ from org.csstudio.display.builder.runtime.script import PVUtil, ScriptUtil
 
 # widget.setPropertyValue('text', PVUtil.getString(pvs[0]))
 em01 = ScriptUtil.findWidgetByName(widget, 'Tabs')
-Tab_index= em01.getPropertyValue('active_tab')
-pv_ch_val="DIFF "+str(Tab_index+1)
-pvs[0].setValue(pv_ch_val)
-pvs[2].setValue(pv_ch_val)]]></text>
+tab_index= em01.getPropertyValue('active_tab')
+pvs[0].setValue(tab_index)
+pvs[2].setValue(tab_index)]]></text>
       <pv_name trigger="false">$(P)$(R)PRB2-Channel</pv_name>
       <pv_name>$(P)$(R)PRB2-TR0-ArrayData</pv_name>
       <pv_name trigger="false">$(P)$(R)PRB3-Channel</pv_name>