PLC-Inspector
Modbus/TCP for Siemens LOGO!
Free · In‑App Purchases
Reading is free: memory, bits and live register changes over Modbus/TCP. Writing is Pro, a one-time purchase instead of a subscription. iCloud sync for everyone.
PLC-Inspector is a professional diagnostic tool for Siemens LOGO! controllers. Read memory, follow changes live and set registers, over Modbus/TCP, directly from iPhone, iPad or Mac.
KEY FEATURES
• Memory reading
VM memory, analog inputs (AI) and analog outputs (AQ) of your LOGO! in real time.
• Register writing
Enter values in decimal or hexadecimal and send them to the controller. The app checks what the controller reports back and says so separately when the confirmation does not match the request.
• Safeguarded writing
Write mode has to be switched on deliberately and expires when you leave the view. Before every write there is a confirmation showing register and value in plain text, which can be switched off for a working session.
• Bit-level visualisation
Every register as a 16-bit value with colour-coded bit display.
• Change detection
Changed values are highlighted in orange. Jump between changes with the arrow buttons.
• Auto-refresh
Automatic updates in intervals from 0.5 to 10 seconds.
• Multiple stations
Manage any number of PLC stations with individual settings.
APPLICATIONS
- Commissioning and fault finding on site
- Mobile process monitoring
- Analysis of memory contents
- Training and education
TECHNICAL DETAILS
- Protocol: Modbus/TCP (default port 502)
- Reading: Read Holding Registers (FC 03), automatic splitting above 125 registers
- Writing: Write Single Register (FC 06) with echo verification
- Supported controller: Siemens LOGO! 8 (0BA8)
NOTE
The app needs a network connection to the LOGO! controller. The Modbus server must be enabled in LOGO!Soft Comfort.
Developed by spiritdev Softwareentwicklung GmbH - your partner for industrial software solutions.
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PLC-Inspector is now free. Reading memory, inspecting bits and watching registers stays free.
New: iCloud sync, free for everyone. Stations you set up once are available on every device signed in to your iCloud account.
Writing registers is part of PLC-Inspector Pro, a one-time purchase, no subscription.
Bought PLC-Inspector while it was a paid app? Pro is included for you permanently, along with every future Pro feature. You don't need to do anything.
The developer, spiritdev Softwareentwicklung GmbH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- spiritdev Softwareentwicklung GmbH
- Size
- 4.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, Dutch, French, German, Italian, Polish, Portuguese, Simplified Chinese, Spanish, Turkish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- PLC-Inspector Pro $8.99
- Copyright
- © 2026 spiritdev Softwareentwicklung GmbH