diff --git a/acs/nladmin-system/src/main/java/org/nl/acs/opc/DeviceOpcProtocolRunable.java b/acs/nladmin-system/src/main/java/org/nl/acs/opc/DeviceOpcProtocolRunable.java
index bd67886..a75d8c5 100644
--- a/acs/nladmin-system/src/main/java/org/nl/acs/opc/DeviceOpcProtocolRunable.java
+++ b/acs/nladmin-system/src/main/java/org/nl/acs/opc/DeviceOpcProtocolRunable.java
@@ -109,7 +109,7 @@ public class DeviceOpcProtocolRunable implements Runnable {
                 boolean time_out = false;
 
                 label97:
-                while (true) {
+                while (DeviceOpcSynchronizeAutoRun.isRun) {
                     long begin = System.currentTimeMillis();
                     Map<Item, ItemState> itemStatus = group.read(true, (Item[]) itemsMap.values().toArray(new Item[0]));
                     long end = System.currentTimeMillis();