All posts by vogler

SCADA System is tweeting….

This can be easily achieved by connecting WinCC OA to NodeRed by MQTT. From Node Red it is possible to connect to Twitter and publish tweets. I installed a MQTT server Mosquitto on my SCADA server and connected WinCC OA to this MQTT broker, so that I can send a datapoint value from WinCC OA to MQTT. Node-Red can read this tag from MQTT and publish the message to Twitter…

WinCC OA TwitterNodeRed Twitter

Monitoring with Logstash and WinCC OA…

Monitoring-Concept

 

For example we do this with the Oracle Alert Log. Very often an Oracle Database is used with WinCC OA to store history values. But a lot of times no one takes care of the Oracle database. At least the Alert-Log file should be observed. With Logstash, Apache Kafka and the WinCC OA Apache Kafka Driver we can send alert log messages from the Oracle database(s) to a WinCC OA monitoring system.

Oracle-Alert-Log

Observing WinCC OA Logs with Elasticsearch and Logstash…

With Logstash we can collect the logs of WinCC OA systems and write it to Elasticsearch. Multiple WinCC OA system’s can be observed with a central log database…

With Kibana the logs can be easily discovered – I now see errors what i haven’t seen before in my system…

In parallel the log messages are written to Apache Kafka. With Apache Spark we can now observe the log streams and detect anomalies… a very simple observation could be to just simple count the amount of log messages per timeframe …

logstash

WinCC OA logstash configuration file: winccoa-logstash-conf

WinCC OA RDB-Manager with Oracle vs MongoDB

Keep in Mind: It is not a comparison of the databases only. With Oracle we used the WinCC OA RDB Manager with OA Query-RDB Direct option, and the RDB-Manager has lot of more functionalities than the NoSQL Prototyp! The other databases were tested with a NoSQL Logger Prototyp written in Java, and the implementations for writing and reading are different, because there are different interfaces for each database – for PostgreSQL we used the PostgreSQL JDBC driver, MongoDB has it’s own Java API and InfluxDB uses REST/HTTP. So, not only the speed of the database itself is compared – also the interfaces to WinCC OA and the implementations of reading are taken into account.

Oracle and OA RDB-Manager Results:
2016.07.29 09:09:03.302[“start…”]
2016.07.29 09:09:39.628[36.326][33669]
2016.07.29 09:11:22.051[“start…”]
2016.07.29 09:11:36.213[14.159][33669]

MongoDB Results:
2016.07.29 09:10:37.449[“start…”]
2016.07.29 09:10:53.171[15.72][33669]
2016.07.29 09:11:42.932[“start…”]
2016.07.29 09:11:52.918[9.986][33669]

InfluxDB Results:
WCCOAui1:2016.07.29 09:47:33.441[“start…”]
WCCOAui1:2016.07.29 09:47:42.477[9.035][33668]
WCCOAui1:2016.07.29 09:48:12.733[“start…”]
WCCOAui1:2016.07.29 09:48:18.745[6.011][33668]

it is faster than MongoDB. And our InfluxDB is running on a MacMini (Hyper-V) and the data is stored on a shared Synology NAS for home usage (DS414 slim) – much less power for InfluxDB compared to the four 7.2k disks and to the i7 where the Oracle DB and MonogDB is running on.

PostgreSQL Results:
WCCOAui1:2016.07.29 09:56:55.062[“start…”]
WCCOAui1:2016.07.29 09:57:03.475[8.41][33669]
WCCOAui1:2016.07.29 09:57:14.767[“start…”]
WCCOAui1:2016.07.29 09:57:20.196[5.427][33669]

PostgreSQL is running on the same machine and disks as Oracle and MongoDB.