--- a/master/domain.h	Thu Sep 06 14:40:10 2012 +0200
+++ b/master/domain.h	Thu Sep 06 18:28:57 2012 +0200
@@ -63,12 +63,15 @@
     ec_origin_t data_origin; /**< Origin of the \a data memory. */
     uint32_t logical_base_address; /**< Logical offset address of the
                                      process data. */
-    struct list_head datagrams; /**< Datagrams for process data exchange. */
+    struct list_head datagram_pairs; /**< Datagrams pairs (main/backup) for
+                                       process data exchange. */
 
-    uint16_t working_counter; /**< Last working counter value. */
+    uint16_t working_counter[EC_NUM_DEVICES]; /**< Last working counter
+                                                values. */
     uint16_t expected_working_counter; /**< Expected working counter. */
     unsigned int working_counter_changes; /**< Working counter changes
                                              since last notification. */
+    unsigned int redundancy_active; /**< Non-zero, if redundancy is in use. */
     unsigned long notify_jiffies; /**< Time of last notification. */
 };