Sending Siemens SIMATIC PCS 7 logs to Elastic


Collecting logs from Siemens SIMATIC PCS 7 and sending them to Elastic can be a complex task because of the unique combination of the log source and the desired destination. In this post, we will take you through the process of forwarding log data from SIMATIC PCS 7 to Elastic using the NXLog log collection agent.


Siemens SIMATIC PCS 7 is a distributed control system (DCS) solution that uses many Siemens hardware components supported and configured by PCS 7 software tools. Deployments usually consist of Engineering stations (ES), Operating stations (OS), and Automation stations (AS). The PCS 7 AS features the Siemens SIMATIC S7-400 series central processing unit, designed to automate plants requiring many I/O signals and control loops. SIMATIC PCS 7 is commonly used for automation tasks in various industrial sectors such as chemicals, petrochemicals, water treatment, pharmaceuticals, and power generation.

SCADA systems and Siemens have a couple of things in common: they employ a variety of network protocols to facilitate communication between various types of nodes (physical computers, CPUs, distributed I/Os, and field devices) and SCADA for storing data. Consequently, both solutions are firmly integrated within corporate networks where such nodes are typically deployed.

Collecting SIMATIC PCS 7 logs

SIMATIC PCS 7 produces a wide variety of operational logs. Some are sent to Windows Event Log, but most are stored as flat files.

SIMATIC PCS 7 controls systems that are of significant financial and security importance. In mission-critical settings, the timely collection and processing of SIMATIC PCS 7 logs is crucial to the reliability and security of the systems it controls. However, the sheer diversity of log formats and data structures and the noise that some of these logs contain pose severe challenges to most logging software. A brief interruption of normal operations could result in catastrophic consequences.

NXLog Enterprise Edition is a lightweight, modular log collection tool capable of tackling the most demanding cases log collection may pose. Its features enable it to parse, filter, process, aggregate, and output logs in any structured data format that a SIEM might require. Given its perfect balance of functionality and performance, it is the best choice for collecting and processing SIMATIC PCS 7 logs.

Collecting SIMATIC PCS 7 logs from Windows Event Log

Many applications send their logs directly to Windows Event Log, the preferred logging facility on the Windows platform. SIMATIC PCS 7 sends its PC station, NET configuration, adapter operation-related information, and information about various other services to Windows Event Log.

Collecting SIMATIC PCS 7 logs from file

File-based PCS7 logs include WinCC system diagnostics logs, SQL Server logs of WinCC, OS project logs, AS project logs, Multi-project logs, and Batch logs coming from Automation, Engineering, and Operator stations.

The easiest way to collect and normalize Siemens SIMATIC PCS 7 log data is by deploying NXLog. With its unique capabilities, logs can be collected from literally any file in any format. Given the wide variation in format and structure of such log files, its versatility is ideal for these systems.

For more information on integrating NXLog with SIMATIC PCS 7, see the Siemens SIMATIC PCS 7 integration guide.

The sources mentioned above and NXLog’s features play a vital role when normalizing logs to be accepted by Elastic.

Sending logs to Elastic

Elasticsearch is a search engine and document database for storing, searching, and analyzing log data that you can deploy locally. On the other hand, Elastic Cloud is a SaaS solution that adds value to Elastic with its cloud-native features, such as managed enterprise search, data visualization, and security.

NXLog can integrate with both products by collecting and sending logs or as a relay, aggregating logs it receives from various sources and forwarding them.

Elasticsearch logs

NXLog Enterprise Edition provides the om_elasticsearch output module that supports sending logs in bulk to Elasticsearch. With the NXLog Community Edition, the om_http module sends logs to Elasticsearch for low-volume logging scenarios. Because it sends a request to the Elasticsearch HTTP REST API for each event, HTTP request and response latency limit the maximum logging throughput.

Elastic Cloud logs

The Elasticsearch REST API is used to send logs to the Elastic cloud. For NXLog to connect to the API, it requires an API key, the Elasticsearch endpoint, and the Elastic Cloud CA certificate. These requirements are configured on the main menu under Management > Stack Management.

You can view the log records by logging in to your Elastic Cloud instance. Navigate to Analytics > Discover from the main menu, then select the relevant index pattern to display the data.

For more information on configuring NXLog and sending logs to Elasticsearch and Elastic Cloud respectively, please visit the Elasticsearch and Kibana and Elastic Cloud integration sections in the NXLog User Guide.

NXLog Ltd. develops multi-platform log collection tools that support many different log sources, formats, transports, and integrations. The tools help administrators collect, parse, and forward logs so they can more easily respond to security issues, investigate operational problems, and analyze event data. NXLog distributes the free and open source NXLog Community Edition and offers additional features and support with the NXLog Enterprise Edition.

This document is provided for informational purposes only and is subject to change without notice. Trademarks are the properties of their respective owners.