: Without a key, the software has a 10-minute connection limit ; after 30 days, connections are no longer possible without a license.
Keep a dedicated network folder with the exact installation executables ( .exe files) that correspond to your purchased license keys. This prevents version mismatch issues if you need to reinstall the software years down the road.
As of early 2026, licenses are typically , meaning you pay once for a specific major version and can use it indefinitely. License Quantity Price per License (USD) 1 to 2 Licenses $129.00 Individual engineers or small setups. 3 to 9 Licenses $119.00 Small teams or testing labs. 10+ Licenses $109.00 Large-scale industrial engineering departments.
A site license allows an unlimited number of users within a single corporate geographic location (a specific building or campus) to install and run the software. This is highly cost-effective for large automation departments. How to Obtain and Activate a New License Key modbus slave license key new
, uninstall Modbus Slave completely from Add/Remove Programs in Windows Control Panel.
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This comprehensive guide covers everything you need to know about acquiring, activating, and troubleshooting a , ensuring your supervisory control and data acquisition (SCADA) or programmable logic controller (PLC) networks run without a hitch. Understanding the Modbus Slave Software : Without a key, the software has a
Ideal for engineering teams and corporations. A site license allows an unlimited number of users within a single company or organization at one physical location to use the software. How to Obtain and Activate a New License Key
: Unlicensed versions typically have restrictions, such as a 10-minute connection limit or a maximum of six replies before requiring a restart. Popular Modbus Slave Software & Pricing Software Provider License Type Estimated Price (USD) Key Feature Witte Software Single-User Perpetual with free maintenance Simply Modbus Targeted at individual RTU/ASCII or TCP needs Rapid SCADA Driver Plugin Specifically for SCADA system integration Siemens (Simatic) Single License ~$3,077.94 Industrial-grade for S7 PLCs (includes HW dongle)
Ensure the version of Modbus Slave installed on your machine matches the version you purchased. Downloading a legacy version 7 installer while holding a brand-new version 8 key will result in an invalid key error. As of early 2026, licenses are typically ,
A free master and slave test tool available on GitHub that supports TCP, UDP, and RTU. ArduinoModbusSlave A community-driven library for Arduino users. in a particular programming language? Introduction to Modbus TCP/IP - ProSoft Technology
Most licenses allow activation on a limited number of devices—typically 1 to 2 machines per license. If you've exceeded this limit, you'll need to deactivate on an old device before activating on a new one, or contact the vendor to request an activation reset. Licenses are perpetual but may have specific terms regarding number of installations.