diff --git a/CC100_HW/module.php b/CC100_HW/module.php
index f0b15c3..44fa817 100644
--- a/CC100_HW/module.php
+++ b/CC100_HW/module.php
@@ -118,7 +118,7 @@ class CC100_HW extends IPSModule
 
     private function TryWriteFile($starttime)
     {
-        $this->readAndConvertToBools($DIN_FILE);
+        $this->readAndConvertToBools($this->$DIN_FILE);
 
         $currentTime = microtime(true) * 1000;
         if ($currentTime - $starttime <= $this->maxTime) {