diff --git a/scada-common/psil.lua b/scada-common/psil.lua
index f3d810a..029a79e 100644
--- a/scada-common/psil.lua
+++ b/scada-common/psil.lua
@@ -74,6 +74,13 @@ function psil.create()
         end
     end
 
+    -- get the currently stored value for a key or nil if not set
+    ---@param key string data key
+    ---@return any
+    function public.get(key)
+        if ic[key] ~= nil then return ic[key].value else return nil end
+    end
+
     -- clear the contents of the interconnect
     function public.purge() ic = {} end
 
diff --git a/scada-common/types.lua b/scada-common/types.lua
index ca1b885..19392fe 100644
--- a/scada-common/types.lua
+++ b/scada-common/types.lua
@@ -253,6 +253,61 @@ types.ENERGY_SCALE_UNITS = {
     "RF"
 }
 
+local GENERIC_STATE = {
+    OFFLINE = 1,
+    UNFORMED = 2,
+    FAULT = 3,
+    IDLE = 4,
+    ACTIVE = 5
+}
+
+---@enum REACTOR_STATE
+types.REACTOR_STATE = {
+    OFFLINE = 1,
+    UNFORMED = 2,
+    FAULT = 3,
+    DISABLED = 4,
+    ACTIVE = 5,
+    SCRAMMED = 6,
+    FORCE_DISABLED = 7
+}
+
+---@enum BOILER_STATE
+types.BOILER_STATE = GENERIC_STATE
+
+---@enum TURBINE_STATE
+types.TURBINE_STATE = {
+    OFFLINE = 1,
+    UNFORMED = 2,
+    FAULT = 3,
+    IDLE = 4,
+    ACTIVE = 5,
+    TRIPPED = 6
+}
+
+---@enum TANK_STATE
+types.TANK_STATE = {
+    OFFLINE = 1,
+    UNFORMED = 2,
+    FAULT = 3,
+    ONLINE = 4,
+    LOW_FILL = 5,
+    HIGH_FILL = 6
+}
+
+---@enum IMATRIX_STATE
+types.IMATRIX_STATE = {
+    OFFLINE = 1,
+    UNFORMED = 2,
+    FAULT = 3,
+    ONLINE = 4,
+    LOW_CHARGE = 5,
+    HIGH_CHARGE = 6
+}
+
+---@enum SPS_STATE
+types.SPS_STATE = GENERIC_STATE
+
 ---@enum PANEL_LINK_STATE
 types.PANEL_LINK_STATE = {
     LINKED = 1,
diff --git a/scada-common/util.lua b/scada-common/util.lua
index 86645f8..3023a49 100644
--- a/scada-common/util.lua
+++ b/scada-common/util.lua
@@ -24,7 +24,7 @@ local t_pack   = table.pack
 local util = {}
 
 -- scada-common version
-util.version = "1.4.6"
+util.version = "1.4.7"
 
 util.TICK_TIME_S = 0.05
 util.TICK_TIME_MS = 50