diff --git a/CHANGELOG.md b/CHANGELOG.md
index 35ef4dd..9c64b2c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## [1.1.0-beta.8] 2022-09-25
+## [1.1.0-beta.9] 2022-09-26
 ### Changed
 **Action required** Breaking changes!
 In order to support configuration by GUI some configuration options needs to be renamed.
@@ -86,6 +86,8 @@ In order to support configuration by GUI some configuration options needs to be
 - `PLC_AirPurifier`
 - `PLC_FilterMaintenance`
 
+### Changed
+- Use seperate buffer for each set operation
 
 ## [1.0.37] 2022-04-23
 ### Fixed
diff --git a/index.js b/index.js
index 2b5400f..8793cc0 100644
--- a/index.js
+++ b/index.js
@@ -278,7 +278,6 @@ function GenericPLCAccessory(platform, config, accessoryNumber) {
   this.platform = platform;
   this.log = platform.log;
   this.name = config.name;
-  this.buf = Buffer.alloc(4);
   var uuid = UUIDGen.generate(config.name + config.accessory);
   this.config = config;
   this.accessory = new PlatformAccessory(this.name, uuid);
@@ -1691,7 +1690,7 @@ GenericPLCAccessory.prototype = {
       );}.bind(this));
     }
 
-    if ('get_FilterLifeLevel' in config) {
+    if ('get_FilterLifeLevel' in this.config) {
       this.service.getCharacteristic(Characteristic.FilterLifeLevel)
       .on('get', function(callback) {this.getByte(callback,
         config.db,
@@ -3186,12 +3185,13 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setOnOffBit DB" + db + "DBX"+ offset + "." + bit + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
+    var buf = Buffer.alloc(1);
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
 
-      this.buf[0] = 1;
-      S7Client.WriteArea(S7Client.S7AreaDB, db, ((offset*8) + bit), 1, S7Client.S7WLBit, this.buf, function(err) {
+      buf.writeUInt8(1);
+      S7Client.WriteArea(S7Client.S7AreaDB, db, ((offset*8) + bit), 1, S7Client.S7WLBit, buf, function(err) {
         if(err) {
           log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
           if(err & 0xFFFFF) {S7Client.Disconnect();}
@@ -3218,6 +3218,7 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setBit DB" + db + "DBX"+ offset + "." + bit + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
+    var buf = Buffer.alloc(1);
     var valuePLC = value;
     if (typeof(valueMod) != 'undefined' && valueMod)
     {
@@ -3226,8 +3227,8 @@ GenericPLCAccessory.prototype = {
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-      this.buf[0] = valuePLC ? 1 : 0;
-      S7Client.WriteArea(S7Client.S7AreaDB, db, ((offset*8) + bit), 1, S7Client.S7WLBit, this.buf, function(err) {
+      buf.writeInt8(valuePLC ? 1 : 0);
+      S7Client.WriteArea(S7Client.S7AreaDB, db, ((offset*8) + bit), 1, S7Client.S7WLBit, buf, function(err) {
         if(err) {
           log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
           if(err & 0xFFFFF) {S7Client.Disconnect();}
@@ -3301,7 +3302,7 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setReal DB" + db + "DBD"+ offset + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
-    var buf = this.buf;
+    var buf = Buffer.alloc(4);
     var valuePLC = value;
     if (typeof(valueMod) != 'undefined' && valueMod)
     {
@@ -3310,7 +3311,7 @@ GenericPLCAccessory.prototype = {
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-        buf.writeFloatBE(valuePLC, 0);
+        buf.writeFloatBE(valuePLC);
         S7Client.WriteArea(S7Client.S7AreaDB, db, offset, 1, S7Client.S7WLReal, buf, function(err) {
           if(err) {
             log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
@@ -3347,19 +3348,16 @@ GenericPLCAccessory.prototype = {
     var value = 0;
     var pushMirror = function(value) { this.platform.mirrorGet(logprefix, "&db="+db+"&offset="+ offset + "&value="+ value);}.bind(this);
 
-    log.debug(logprefix , "olitest step 1");
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-        log.debug(logprefix , "olitest step 2");
         S7Client.ReadArea(S7Client.S7AreaDB, db, offset, 1, S7Client.S7WLReal, function(err, res) {
-          log.debug(logprefix , "olitest step 3");
           if(err) {
             log.error(logprefix, "ReadArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
             if(err & 0xFFFFF) {S7Client.Disconnect();}
             callback(new Error('PLC error'));
           }
           else {
-            var valuePLC = res.readFloatBE(0);
+            var valuePLC = res.readFloatBE();
             if (typeof(valueMod) != 'undefined' && valueMod)
             {
               value = valueMod(valuePLC);
@@ -3388,7 +3386,7 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setByte DB" + db + "DBB"+ offset + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
-    var buf = this.buf;
+    var buf = Buffer.alloc(1);
     var valuePLC = value;
     if (typeof(valueMod) != 'undefined' && valueMod)
     {
@@ -3397,7 +3395,7 @@ GenericPLCAccessory.prototype = {
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-        buf[0] = valuePLC;
+        buf.writeUInt8(valuePLC);
         S7Client.WriteArea(S7Client.S7AreaDB, db, offset, 1, S7Client.S7WLByte, buf, function(err) {
           if(err) {
             log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
@@ -3443,7 +3441,7 @@ GenericPLCAccessory.prototype = {
             callback(new Error('PLC error'));
           }
           else {
-            var valuePLC = res[0];
+            var valuePLC = res.readUInt8();
             if (typeof(valueMod) != 'undefined' && valueMod)
             {
               value = valueMod(valuePLC);
@@ -3471,7 +3469,7 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setInt DB" + db + "DBW"+ offset + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
-    var buf = this.buf;
+    var buf = Buffer.alloc(2);
     var valuePLC = value;
     if (typeof(valueMod) != 'undefined' && valueMod)
     {
@@ -3480,7 +3478,7 @@ GenericPLCAccessory.prototype = {
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-        buf.writeInt16BE(valuePLC, 0);
+        buf.writeInt16BE(valuePLC);
         S7Client.WriteArea(S7Client.S7AreaDB, db, offset, 1, S7Client.S7WLWord, buf, function(err) {
           if(err) {
             log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
@@ -3527,7 +3525,7 @@ GenericPLCAccessory.prototype = {
             callback(new Error('PLC error'));
           }
           else {
-            valuePLC = res.readInt16BE(0);
+            valuePLC = res.readInt16BE();
             if (typeof(valueMod) != 'undefined' && valueMod)
             {
               value = valueMod(valuePLC);
@@ -3557,7 +3555,7 @@ GenericPLCAccessory.prototype = {
     var logprefix = "[" + this.name + "] " + characteristic + ": %s (setDInt DB" + db + "DBD"+ offset + ")";
     var S7Client = this.platform.S7Client;
     var log = this.log;
-    var buf = this.buf;
+    var buf = Buffer.alloc(4);
     var valuePLC = value;
     if (typeof(valueMod) != 'undefined' && valueMod)
     {
@@ -3566,7 +3564,7 @@ GenericPLCAccessory.prototype = {
 
     //ensure PLC connection
     if (this.platform.S7ClientConnect()) {
-        buf.writeInt32BE(valuePLC, 0);
+        buf.writeInt32BE(valuePLC);
         S7Client.WriteArea(S7Client.S7AreaDB, db, offset, 1, S7Client.S7WLDWord, buf, function(err) {
           if(err) {
             log.error(logprefix, "WriteArea failed #" + err.toString(16) + " - " + S7Client.ErrorText(err));
@@ -3613,7 +3611,7 @@ GenericPLCAccessory.prototype = {
             callback(new Error('PLC error'));
           }
           else {
-            valuePLC = res.readInt32BE(0);
+            valuePLC = res.readInt32BE();
             if (typeof(valueMod) != 'undefined' && valueMod)
             {
               value = valueMod(valuePLC);
diff --git a/package.json b/package.json
index d946e31..0abbda9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "homebridge-plc",
-  "version": "1.1.0-beta.8",
+  "version": "1.1.0-beta.9",
   "description": "Homebridge plugin for Siemens Step7 and compatible PLCs. (https://github.com/homebridge)",
   "license": "MIT",
   "keywords": [