diff --git a/src/revpi_middleware/ios1/interface_ios.py b/src/revpi_middleware/ios1/interface_ios.py
index c6d3f8d..ef53f5e 100644
--- a/src/revpi_middleware/ios1/interface_ios.py
+++ b/src/revpi_middleware/ios1/interface_ios.py
@@ -110,6 +110,9 @@ class InterfaceInput:
 
     @property
     def value(self) -> Variant:
+        if not self.io._parentdevice._selfupdate:
+            self.io._parentdevice.readprocimg()
+
         return Variant(
             self.variant_type,
             self.io.get_value() if self._raw else self.io.value,
@@ -145,7 +148,8 @@ class InterfaceOutput(InterfaceInput):
             self.io.set_value(value)
         else:
             self.io.value = value
-        self.io._parentdevice._modio.writeprocimg()
+        if not self.io._parentdevice._selfupdate:
+            self.io._parentdevice.writeprocimg()
 
 
 class InterfaceIoManager: