diff --git a/icta_controller/commands.lua b/icta_controller/commands.lua
index feb9cd0..d5b5522 100644
--- a/icta_controller/commands.lua
+++ b/icta_controller/commands.lua
@@ -179,7 +179,7 @@ techage.icta_register_condition("state", {
 			type = "textlist",
 			name = "value",
 			label = "",
-			choices = "stopped,running,standby,blocked,nopower,fault,unloaded,invalid,on,off",
+			choices = "stopped,running,standby,blocked,nopower,fault,unloaded,invalid,on,off,empty,loaded,loading,full",
 			default = "stopped",
 		},
 		{
@@ -793,3 +793,36 @@ techage.icta_register_condition("get_filter", {
 		return condition, result
 	end,
 })
+
+techage.icta_register_action("exchange", {
+	title = "place/remove a block via the Door Controller II",
+	formspec = {
+		{
+			type = "number", 
+			name = "number", 
+			label = "number", 
+			default = "",
+		},
+		{
+			type = "number", 
+			name = "slot", 
+			label = "slot no", 
+			default = "1",
+		},
+		{
+			type = "label", 
+			name = "lbl", 
+			label = "place/remove a block via\nthe Door Controller II\n", 
+		},
+	},
+	button = function(data, environ) 
+		return 'exch('..techage.fmt_number(data.number)..","..data.slot..')'
+	end,
+	code = function(data, environ)
+		return function(env, output, idx)
+			local payload = data.slot
+			techage.send_single(environ.number, data.number, "exchange", payload)
+		end
+	end,
+})
+
diff --git a/logic/logic_block.lua b/logic/logic_block.lua
index 1117177..51bad9d 100644
--- a/logic/logic_block.lua
+++ b/logic/logic_block.lua
@@ -351,7 +351,7 @@ techage.register_node({"techage:ta3_logic2"}, {
 		nvm.blocking_time = nvm.blocking_time or M(pos):get_float("blocking_time")
 		nvm.inp_tbl = nvm.inp_tbl or {}
 		
-		if src ~= nvm.own_num and techage.SystemTime > (mem.ttl or 0) then
+		if src ~= nvm.own_num then
 			if topic == "on" then
 				nvm.inp_tbl[src] = "on"
 			elseif topic == "off" then
@@ -360,8 +360,9 @@ techage.register_node({"techage:ta3_logic2"}, {
 				return "unsupported"
 			end
 			
+			local t = math.max((mem.ttl or 0) - techage.SystemTime, 0.1)
+			minetest.get_node_timer(pos):start(t)
 			mem.ttl = techage.SystemTime + (nvm.blocking_time or 0)
-			minetest.get_node_timer(pos):start(0.1)
 		end
 	end,
 })