PLC Inspector
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About this app
PLC Inspector is a diagnostic tool for Siemens LOGO! controllers. Read memory, watch values change live and write registers deliberately, over Modbus/TCP, straight from your phone or tablet.
MAIN FEATURES
• Read memory
VM memory, analogue inputs (AI) and analogue outputs (AQ) of your LOGO! in real time. Ranges larger than the Modbus limit are split into several requests automatically.
• Write registers
Enter values in decimal or hexadecimal and send them to the controller. The app checks what the controller echoes back and says so separately when the confirmation does not match what was sent.
• Safe writing
Write mode has to be armed deliberately and switches itself off when you leave the view. Every write is preceded by a confirmation naming the register and the value in plain words. During longer work it can be suppressed for the session, and while it is off the app says so on screen.
• Bit level view
Every register as a 16 bit value, with each bit shown separately and every fourth one marked, so nibbles can be counted without counting digits.
• Change detection
Values that changed since the previous read are highlighted. Step from one change to the next with the arrow buttons.
• Automatic refresh
Refresh at intervals from 0.5 to 10 seconds. Each read waits for the previous one to finish, so requests never pile up on the controller.
• Several controllers
Manage as many stations as you need, each with its own memory range and refresh interval.
• Made for tablets
On a tablet the station list and the memory view sit side by side, and the table places several registers next to each other instead of leaving half the screen empty.
TYPICAL USES
- Commissioning and fault finding at the cabinet
- Mobile process monitoring
- Analysing what a controller actually holds in memory
REQUIREMENTS
The Modbus server has to be enabled on the LOGO!. It is off by default and is switched on in LOGO! Soft Comfort under the network settings. The LOGO! web server on port 80 works independently of it, so a reachable web interface does not mean Modbus is running.
Only LOGO! 8 (0BA8) speaks Modbus/TCP. Earlier generations do not.
PRIVACY
The app talks to your controller directly over your own network. No cloud, no intermediate server, no account, no tracking. Your stations are included in Android's backup for your Google account, and can be exported to a file at any time. Only name, address, port and offset are stored, never a password.
PRO
Reading memory, inspecting bits and monitoring registers are free and stay free. Writing single registers is a one-time purchase, no subscription.
MAIN FEATURES
• Read memory
VM memory, analogue inputs (AI) and analogue outputs (AQ) of your LOGO! in real time. Ranges larger than the Modbus limit are split into several requests automatically.
• Write registers
Enter values in decimal or hexadecimal and send them to the controller. The app checks what the controller echoes back and says so separately when the confirmation does not match what was sent.
• Safe writing
Write mode has to be armed deliberately and switches itself off when you leave the view. Every write is preceded by a confirmation naming the register and the value in plain words. During longer work it can be suppressed for the session, and while it is off the app says so on screen.
• Bit level view
Every register as a 16 bit value, with each bit shown separately and every fourth one marked, so nibbles can be counted without counting digits.
• Change detection
Values that changed since the previous read are highlighted. Step from one change to the next with the arrow buttons.
• Automatic refresh
Refresh at intervals from 0.5 to 10 seconds. Each read waits for the previous one to finish, so requests never pile up on the controller.
• Several controllers
Manage as many stations as you need, each with its own memory range and refresh interval.
• Made for tablets
On a tablet the station list and the memory view sit side by side, and the table places several registers next to each other instead of leaving half the screen empty.
TYPICAL USES
- Commissioning and fault finding at the cabinet
- Mobile process monitoring
- Analysing what a controller actually holds in memory
REQUIREMENTS
The Modbus server has to be enabled on the LOGO!. It is off by default and is switched on in LOGO! Soft Comfort under the network settings. The LOGO! web server on port 80 works independently of it, so a reachable web interface does not mean Modbus is running.
Only LOGO! 8 (0BA8) speaks Modbus/TCP. Earlier generations do not.
PRIVACY
The app talks to your controller directly over your own network. No cloud, no intermediate server, no account, no tracking. Your stations are included in Android's backup for your Google account, and can be exported to a file at any time. Only name, address, port and offset are stored, never a password.
PRO
Reading memory, inspecting bits and monitoring registers are free and stay free. Writing single registers is a one-time purchase, no subscription.
Read, watch and write Siemens LOGO! memory over Modbus/TCP.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- No data collectedLearn more about how developers declare collection
What’s new
First release. Reads and writes the memory of a Siemens LOGO! 8 over Modbus/TCP.
App support
About the developer
Spiritdev Softwareentwicklung GmbH
info@spiritdev.de
Carl-Zeiss-Str. 8
21465 Reinbek
Germany
+49 40 53005166