# PLC Probe — S7 Diagnostics & Monitoring

> S7 Diagnostics & Monitoring (iPhone/iPad app by Jaden Adedapo.)

- Source: https://appshunter.io/ios/app/plc-probe/id6785402316 (this page in markdown: same URL + `.md`)
- Developer: [Jaden Adedapo](https://appshunter.io/developer/6785402318)
- Category: Utilities, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 44 MB
- Languages: American English, German (Germany)
- Released: 2026-09-16
- Data updated: 2026-10-25

## What is PLC Probe?

PLC Probe is a diagnostics and monitoring tool for Siemens S7-1200 and S7-1500 controllers. It connects to a CPU on the local network and displays identity, confirmed RUN/STOP state, a separate MAINT indication, cycle times, available hardware and network information, program blocks, data block variables, live values, alarms, events, and measurement dashboards. The interface is designed for iPhone, iPad, and Mac. A built-in Demo PLC lets you explore the core workflow without hardware or a network connection.

PLC Probe displays CPU-provided program folders, tag tables, comments, and interfaces where the connected CPU makes them available. Confirmed initial values for supported optimized S7-1500 data blocks can be requested separately from current online values. Available Safety data is displayed read-only.

The free version supports one saved CPU, up to 10 simultaneous live tags, and read-only access to diagnostics and program data. PLC Probe Pro extends the number of CPUs and live tags and includes write actions, history, dashboard recording and export, and reading and saving available CPU source as .scl, .txt, or .xml.

Write actions immediately modify the connected controller. They are intended for authorized professionals and require confirmation of the target and value. PLC Probe does not generate a complete TIA project or replace safety engineering and validation.

Siemens, SIMATIC, S7-1200, and S7-1500 are trademarks of Siemens AG. PLC Probe is an independent product and is not affiliated with or endorsed by Siemens.

Privacy Policy: https://www.someworkflow.de/datenschutz
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| PLC Probe Pro Monthly | $7.99 | per month |
| PLC Probe Pro Yearly | $79.99 | per year |
| PLC Probe Pro Weekly | $2.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PLC Probe Pro Lifetime | $199.99 | one-time |


## Is PLC Probe safe?

Not enough ratings yet to assess PLC Probe.

## Is PLC Probe legit?

PLC Probe has limited verification signals. The AppsHunter Legitimacy Score for PLC Probe is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 0.5 — 2026-10-18

Version 0.5 expands program analysis, improves variable editing, and makes more features available for free.

• More in Free: Save unlimited CPUs and read PLC tag tables, including available system variables and global constants. Up to 10 simultaneous live tags remain free.
• Program source with Pro: Read available SCL/STL source and supported LAD/FBD, GRAPH, and CEM structures with network comments and block interfaces. Jump directly to a network and navigate scrollable diagrams.
• Source export with Pro: Export complete supported SCL blocks as .scl and supported LAD-only blocks as .s7dcl. Text and original XML exports remain available. Export requires readable source and the necessary metadata.
• Better variable editing: Type-specific input for 28 scalar data types, including dates, times, durations, STRING, and WSTRING. Edit fractional seconds and raw values directly; incomplete input stays visible for correction. Pro writes recheck the target and input, then verify the result by reading it back.
• Separate initial values: Read supported numeric, STRING, and WSTRING initial values in confirmed optimized S7-1500 DBs independently of current online values.
• More hardware details: Expanded network and PROFINET identity information, plus Siemens reference data for recognized memory cards with Pro. Rated capacity stays separate from online memory usage.
• Clearer diagnostics: Better separation of confirmed alarms and technical messages. Inspect available Safety data read-only on confirmed failsafe CPUs.
• More reliable monitoring: Clearer handling of status startup, unchanged values, and stream failures; improvements to reconnects, live subscriptions, and typed variable history.
• Smoother browsing: More efficient display of large DB structures and arrays, more readable long block names, and improved tables, detail views, and navigation on iPhone, iPad, and Mac.

### 0.4 — 2026-10-08

• Organize CPUs by customer and project.
• With Pro, view available CPU source as SCL/STL, LAD/FBD, and GRAPH structures and save it as .scl, .txt, or .xml.
• Read network comments, interfaces, and original CPU program folders more clearly.
• Request confirmed numeric, String, and WString initial values for supported S7-1500 data blocks separately from online values.
• Inspect available Safety data read-only.
• Edit dates, times, and durations with native iPhone and iPad controls; improved navigation when rotating the device.

### 0.3 — 2026-09-16

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*