Paessler PRTG

Improve the reliability of your industrial network with Modbus monitoring


  • Use Modbus TCP/IP and Modbus RTU protocols for comprehensive monitoring
  • Ensure reliable communications between Modbus devices
  • Set preventive maintenance tasks in place before potential issues escalate

Our users give top ratings for monitoring with Paessler PRTG



PRTG makes Modbus monitoring easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent OT network performance issues.



Keep your Modbus network talking

Modbus, initially used in industrial manufacturing, is now in almost every sector, including cloud services, e-health, security, telecommunications, and even farming, among others. Whether your IT systems use Modbus RTU or Modbus TCP-enabled devices, having a 24/7/365 watchdog on your Modbus network is critical to business continuity. Paessler PRTG Modbus monitoring is your solution to keep your Modbus communications going strong.

Simplify your complex IT/OT network


Networks can be complex, and networks using Modbus-enabled devices are no different. Modbus monitoring simplifies the complexity by standardizing communication protocols across diverse devices.

This unified platform helps you monitor and manage all your IT and OT network components in one place without worrying about different device languages and protocols.

Blur the lines between legacy and new systems


As a systems engineer, you deal with traditional IT devices, edge networks, and even operational technology infrastructures. One of the concerns with any software is how it will work with your converged IT ecosystem.

Modbus monitoring easily integrates new and existing systems, allowing your organization to scale efficiently. By simplifying communications between devices, Modbus monitoring makes integration and interoperability seamless.

Say goodbye to long downtimes


Long downtimes mean lost productivity, lower revenue, recovery expenses, and more. The average cost is estimated at around $5,600 per minute, according to Gartner.

Modbus monitoring quickly pays for itself by significantly enhancing system reliability. Real-time data collection and an immediate alert system help stop network issues before they escalate.

Increase operational efficiency


Efficiency doesn’t have to be a four-letter word. PRTG Modbus monitoring gives you real-time visibility into how your Modbus-enabled devices are doing.

With automated data collection and analysis, time spent manually doing systems checks can now be freed up for more important tasks, such as optimizing processes and improving operational workflows.

Keep your systems secure


IT/OT network security is a matter of real concern for industrial organizations. Monitoring using Modbus provides continuous oversight of your network communications and device behavior.

With round-the-clock monitoring, logging, and analysis, you can identify potential security breaches early and quickly respond, maintaining the integrity of your systems. This is also important for meeting governmental regulations regarding network security, for example, the European NIS-2 Directive.









What Modbus monitoring looks like in PRTG

Diagnose network issues by continuously monitoring your Modbus devices. Show system performance, diagnostics, and troubleshooting information in real- time and visualize data in graphic maps & dashboards to identify problems more easily. Gain the visibility you need to troubleshoot Modbus communications.


Easily find the source of the problem with our PRTG Modbus monitoring solution

Real-time alerts and custom notifications make it easy to solve issues with your Modbus network.




IT experts agree: Paessler PRTG is a great solution for IT infrastructure monitoring


“All-around winning
network monitor”

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“The real beauty of PRTG is the endless possibilities it offers”


“Outstanding cloud



Discover our new product extension
Paessler PRTG OPC UA Server


Get an overview of OT network components in your supervisory and control systems

Do you want to have a full overview of your OT environment in your supervisory and control systems – including traditional IT network components like routers, switches, firewalls, and more?

PRTG OPC UA Server consolidates monitoring data from your OT network and the IIoT in your control system. View all your data in one place for centralized monitoring and alarms.

Find out more


5 reasons to choose PRTG as your Modbus monitoring tool

Get an all-in-one monitoring solution

With Industry 4.0, the number of IIoT devices is constantly increasing. The focus is, for example, on intelligent gateways, devices for monitoring temperature and humidity, and the availability and status of PLCs.

With PRTG as an all-in-one monitoring solution, you always have a complete overview of all devices in your IT, OT, and IIoT infrastructure, and can be notified individually according to defined values.

Monitor hyper-converged IT/OT networks

With PRTG, you can integrate a comprehensive set of features with ease of use and maximum flexibility. In addition to out-of-the-box support for all common IT standards, PRTG offers a RESTful API as well as MQTT, OPC UA, and Redfish support.

Easily integrate shop floors, IoT devices that monitor environmental parameters, and other IT devices and applications that do not use conventional technologies into your monitoring setup.

Benefit from specialized Modbus sensors

PRTG comes with Modbus sensors out of the box to monitor devices that support Modbus RTU or TCP.  Use, for example, the Modbus TCP Custom sensor to monitor values that your Modbus TCP server returns. With this sensor type, you can monitor cooling units, power supply, backup generators, and other peripheral devices.

Our Modbus RTU Custom sensor connects to a Modbus RTU server and monitors up to five returned numeric values, for example, the temperature and humidity of devices.

Monitor more in your Industrial IoT


PRTG extends its traditional network monitoring capabilities by monitoring devices over the Modbus TCP protocol. Monitor the availability and status of PLCs, temperature and switching status of Modbus devices, and power consumption metrics like usage, capacity, voltage, and frequency.

Integrate data from critical structures like HVAC systems and uninterruptible power supplies (UPS) into a central monitoring solution.

Take your monitoring one step further

Go beyond checking how efficient your IT assets are operating. PRTG also gives you comprehensive oversight into the environmental conditions of your data center and the stability of your energy metering systems.

By monitoring the physical conditions, you have the information to ensure optimum data center performance, prevent costly downtime, and provide preventative maintenance.


PRTG is compatible with all major vendors, products, and systems

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Start monitoring Modbus systems with PRTG and see how it can make your network more reliable and your job easier.


Your Modbus monitor at a glance – even on the go

Set up PRTG in minutes and use it on almost any mobile device.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.



PRTG monitors these vendors and applications in one view!


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Watch our 2-minute video about industrial monitoring with PRTG

IIoT, Industry 4.0, M2M – the digitalization of manufacturing is already happening at a rapid pace. More and more, traditionally isolated shop floors and machines need to connect to and communicate with a company’s IT infrastructure for production, maintenance, and logistics. To keep an eye on this IT/OT convergence, a reliable monitoring solution like Paessler PRTG is crucial.



Create innovative solutions with Paessler’s partners

Partnering with innovative vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.


IT that works constitutes a business-critical basis for a company's success. Availability and security must be defined for the respective purpose and closely monitored – by OT and IT alike.

Read more


Integrating monitoring results from PRTG into NetBrain maps makes the foundation for network automation.

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With ScriptRunner, Paessler integrates a powerful event automation platform into PRTG Network Monitor.

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“Excellent tool for detailed monitoring. Alarms and notifications work greatly. Equipment addition is straight forward and server initial setup is very easy. ...feel safe to purchase it if you intend to monitor a large networking landscape.”

Infrastructure and Operations Engineer in the Communications Industry, firm size 10B - 30B USD

Read the entire review at Gartner Peer Insights 


PRTG makes Modbus monitoring easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent OT network performance issues.


Monitoring Modbus: FAQ


1. What is Modbus?

Modbus is a data communications server-client protocol originally for use with programmable logic controllers (PLC). It’s become a standard communications protocol, commonly available to connect industrial electronic devices. Free and openly published, Modbus is popular in industrial environments and many other industries. PRTG offers two native Modbus sensors, the Modbus TCP Custom and the Modbus RTU Custom sensor.

2. What is Modbus monitoring?

Modbus monitoring keeps a continual watch on your Modbus network. It provides real-time data analysis, allowing more informed decision-making. By integrating Modbus RTU and Modbus TCP into PRTG and monitoring it, you can get information about the status of PLCs, HVAC systems, detailed information from energy metering systems, and much more.

3. How is Modbus TCP different from Modbus RTU?

Both are Modbus protocols, but they have different uses. Modbus TCP is suitable for modern Ethernet-based industrial networks and is designed for TCP/IP network communication. Modbus RTU, on the other hand, uses RS-232 or RS-485 serial communication and is more common in legacy systems or limited network structures.

4. How does Modbus TCP work?

Device communication

Modbus devices use regular Ethernet cables and switches to communicate with each other. The difference with Modbus TCP is that an MBAP (Modbus Application Protocol) header is added to the start of each message. The MBAP header contains all the identifying information needed to route the data to the addressed device.

Modbus uses Port 502 for TCP/IP communication, which is important if your data needs to go through a firewall. The TCP/IP network consists of the client connected to a switch or series of switches, to which all the servers on the network are also connected.


Client-server architecture

The server processes a request from the client and acknowledges the request with a success message (response), which may include requested data or status information, or with an error message containing information about the cause of the error. The processing of this request runs completely transparently for the user in the background. In common implementations, no application program is required on the client side.


5. Do PRTG Modbus sensors impact the performance of my Modbus network?

No. PRTG Modbus sensors have a very low-performance impact.

6. What is a sensor in PRTG?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, for example the traffic of a switch port, the CPU load of a server, or the free space on a disk drive.

On average, you need about 5-10 sensors per device or one sensor per switch port.


PRTG the multi-tool

PRTG: The multi-tool for sysadmins

Adapt PRTG individually and dynamically to your needs and rely on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects via HTTP requests
  • Custom sensors: Create your own PRTG sensors for customized monitoring
  • Custom notifications: Create your own notifications and send action triggers to external systems
  • REST Custom sensor: Monitor almost everything that provides data in XML or JSON format


More than just a monitoring tool:
Reasons our customers love PRTG



Still not convinced?


More than 500,000
sysadmins love PRTG

Paessler PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.


Try Paessler PRTG
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Everyone has different monitoring needs. That’s why we let you try PRTG for free.



Paessler PRTG 

Start monitoring Modbus systems with PRTG and see how it can make your network more reliable and your job easier.



Network Monitoring Software - Version (April 10th, 2024)


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