diff --git a/machines.lua b/machines.lua
index 83e11e9..ee3e3b9 100644
--- a/machines.lua
+++ b/machines.lua
@@ -490,12 +490,15 @@ local function registerSimpleElectricItemProcessor(config)
 			local meta=minetest.get_meta(pos)
 			local inv=meta:get_inventory()
 			local srcSlot=inv:get_stack("src",1)
+			local dstSlot=inv:get_stack("dst",1)
 			if fromList=="src" and count==srcSlot:get_count() then
 				meta:set_float("srcTime",-1)
 				meta:set_float("maxSrcTime",0)
 				if meta:get_int("industrialtest.powerAmount")>0 then
 					meta:set_string("formspec",getFormspec(meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*100,meta:get_float("srcTime")/meta:get_float("maxSrcTime")*100))
 				end
+			elseif fromList=="dst" and dstSlot:get_free_space()==0 then
+				minetest.get_node_timer(pos):start(industrialtest.updateDelay)
 			end
 		end,
 		on_metadata_inventory_put=function(pos,listname)
@@ -507,16 +510,24 @@ local function registerSimpleElectricItemProcessor(config)
 			local meta=minetest.get_meta(pos)
 			local inv=meta:get_inventory()
 			local srcSlot=inv:get_stack("src",1)
+			local dstSlot=inv:get_stack("dst",1)
 			if listname=="src" and stack:get_count()==srcSlot:get_count() then
 				meta:set_float("srcTime",-1)
 				meta:set_float("maxSrcTime",0)
 				if meta:get_int("industrialtest.powerAmount")>0 then
 					meta:set_string("formspec",getFormspec(meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*100,meta:get_float("srcTime")/meta:get_float("maxSrcTime")*100))
 				end
+			elseif listname=="dst" and dstSlot:get_free_space()==0 then
+				minetest.get_node_timer(pos):start(industrialtest.updateDelay)
 			end
 		end,
 		_industrialtest_updateFormspec=function(meta)
 			meta:set_string("formspec",getFormspec(meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*100,meta:get_float("srcTime")/meta:get_float("maxSrcTime")*100))
+		end,
+		_industrialtest_onPowerFlow=function(pos)
+			-- FIXME: this probably will require refactor so node timer won't be started
+			-- just to test if machine can process item
+			minetest.get_node_timer(pos):start(industrialtest.updateDelay)
 		end
 	}
 	if industrialtest.mtgAvailable then
@@ -757,12 +768,15 @@ definition={
 		local meta=minetest.get_meta(pos)
 		local inv=meta:get_inventory()
 		local srcSlot=inv:get_stack("src",1)
+		local dstSlot=inv:get_stack("dst",1)
 		if fromList=="src" and count==srcSlot:get_count() then
 			meta:set_float("srcTime",-1)
 			meta:set_float("maxSrcTime",0)
 			if meta:get_float("maxFuelTime")>0 then
 				meta:set_string("formspec",ironFurnaceFormspec(meta:get_float("fuelTime")/meta:get_float("maxFuelTime")*100,0))
 			end
+		elseif fromList=="dst" and dstSlot:get_free_space()==0 then
+			minetest.get_node_timer(pos):start(industrialtest.updateDelay)
 		end
 	end,
 	on_metadata_inventory_put=function(pos,listname,index,stack)
@@ -772,12 +786,15 @@ definition={
 		local meta=minetest.get_meta(pos)
 		local inv=meta:get_inventory()
 		local srcSlot=inv:get_stack("src",1)
+		local dstSlot=inv:get_stack("dst",1)
 		if listname=="src" and stack:get_count()==srcSlot:get_count() then
 			meta:set_float("srcTime",-1)
 			meta:set_float("maxSrcTime",0)
 			if meta:get_float("maxFuelTime")>0 then
 				meta:set_string("formspec",ironFurnaceFormspec(meta:get_float("fuelTime")/meta:get_float("maxFuelTime")*100,0))
 			end
+		elseif listname=="dst" and dstSlot:get_free_space()==0 then
+			minetest.get_node_timer(pos):start(industrialtest.updateDelay)
 		end
 	end
 }