diff --git a/red/s7/s7-briq.js b/red/s7/s7-briq.js
index fac5876..6808f17 100644
--- a/red/s7/s7-briq.js
+++ b/red/s7/s7-briq.js
@@ -45,14 +45,15 @@ const write_msg = new Schema({
         }
     }
 });
+const read_payload = new Schema({
+    variable: {
+        type: String,
+        required: true
+    },
+});
 const read_msg = new Schema({
     plc: plc_schema,
-    payload: {
-        variable: {
-            type: String,
-            required: true
-        },
-    }
+    payload: read_payload
 });
 let s7nodes = {};
 let s7promises = {};