# S7 PLC HMI — Operate S7, LOGO! and Modbus

> Operate S7, LOGO! and Modbus (iPhone/iPad app by JIRI NOVOTNY.)

- Source: https://appshunter.io/ios/app/s7-plc-hmi/id6801989589 (this page in markdown: same URL + `.md`)
- Developer: [JIRI NOVOTNY](https://appshunter.io/developer/6801989591)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 15 MB
- Languages: American English, Czech, Dutch, French (France), German (Germany), Italian, Norwegian Bokmål, Polish, European Portuguese, European Spanish
- Released: 2026-09-03
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/s7-plc-hmi/id6801989589/reviews.md

## What is S7 PLC HMI?

S7 PLC HMI turns your iPhone and iPad into an operator panel for Siemens LOGO! and SIMATIC S7 PLCs. Connect directly over your local network — no cloud, no account, no gateway.

LIVE MONITORING
• Digital and analog values refreshed twice a second
• Analog values with multiplier, decimal formatting and optional limits — out-of-range readings are highlighted
• Level bars and value trends — tap a trend for a large chart with axes
• Blinking alarms with acknowledge command
• Connection state always visible

CONTROL
• Switches, push buttons, valves, motors and drives with start/stop commands
• Pulse buttons and Off/Auto/Manual mode selectors
• Object types with local-mode variants for equipment that can be switched to manual on site
• Safe command sequence matching PLC expectations

GRAPHIC MODE
• Place objects on your own process diagram or a photo of the technology
• Live states and values directly on the schema
• Tap an object to control it, drag objects in the editor

SIRI, SHORTCUTS AND WIDGETS
• Five Shortcuts actions — read values, toggle switches, send pulses, check alarms, set values — by voice with Siri, in automations or via the Action button
• Home and Lock Screen widgets: a single value or a whole PLC group at a glance
• Control Center controls for switches and pulses (iOS 18)

ADDRESSES WITHOUT MANUALS
• LOGO! 8: built-in catalog of the VM map (I, Q, M, NI, NQ, AI, AQ, AM…)
• SIMATIC S7: address builder for M, I, Q and DB areas — bits, bytes, words and reals with live preview

AND MORE
• PLC diagnostics: RUN/STOP state and CPU information
• Backup and transfer of your configuration between devices (AirDrop, Files)
• Built-in demo line — try everything without any hardware
• Localized in 10 languages

COMPATIBILITY
• Siemens LOGO! 8 (0BA8 and newer) with enabled Ethernet communication
• SIMATIC S7-1200/1500 with enabled GET/PUT and non-optimized data blocks
• SIMATIC S7-300/400
• Direct connection over TCP port 102 (S7 protocol) on your local network

FREE VERSION AND FULL VERSION
The free version includes 1 PLC group and 3 objects per group — enough to try the app with your own PLC. A single one-time purchase unlocks unlimited groups and objects on iPhone and iPad.

SAFETY NOTE
Intended for qualified personnel. The app sends commands to real equipment — always follow the safety regulations applicable to your installation.

Siemens, LOGO! and SIMATIC are trademarks of Siemens AG. This app is an independent product and is not made, endorsed, or supported by Siemens AG.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full version | $5.99 | one-time |



## Version history (last 5 releases)

### 1.4 — 2026-09-18

Modbus TCP is here — and the app now runs on your Mac, too: one purchase covers iPhone, iPad and Mac. Reading got much faster as well: a 30-tag group that took 301 ms now reads in 11 ms on our S7-1200.

MODBUS TCP
• Connect to Modbus TCP devices alongside LOGO! and SIMATIC S7 — most PLCs, drives, meters and gateways speak it
• Coils, discrete inputs, holding registers and input registers, with the data types you already use
• Byte order per group and per object (ABCD/CDAB/BADC/DCBA), FC16/FC15 writes, optional 1-based addresses
• Presets and address examples for Siemens, Schneider, Allen-Bradley and ABB — no digging through manuals
• A ready-made sample set for the Siemens MB_SERVER example

FASTER AND STEADIER
• Block reading over all protocols — Modbus TCP, LOGO! and SIMATIC S7: a 30-tag group that 1.3 read in 301 ms now takes 11 ms on our S7-1200 (LOGO!: 21 ms → 2 ms)
• Automatic reconnect after a dropped connection or a phone waking from sleep
• Live value preview while you pick an address — you see what the PLC returns before you save
• Duplicate an object to build rows like HR100, HR101, HR102 in seconds
• Keep the screen awake while connected, for panel use on a stand

### 1.3 — 2026-09-03

SIRI AND SHORTCUTS
• Five actions for the Shortcuts app: read a value, toggle a switch, send a pulse, check an alarm and set a value
• Ask Siri by voice — objects can have alternative names so Siri understands you
• Works in automations (e.g. when your phone joins the workshop Wi-Fi) and with the Action button
• You choose per object what is exposed to Shortcuts

CONTROL CENTER (iOS 18)
• PLC Switch and PLC Pulse controls — send commands without opening the app, even from the Lock Screen

WIDGETS
• PLC Value: one object on your Home or Lock Screen, with a refresh button
• PLC List: values of a whole PLC group at a glance
• Out of reach? Widgets keep the last known values and show their age; a tap opens the app and connects

ALSO
• Switch PLC groups straight from the list title
• New help chapter for Shortcuts and Siri with step-by-step screenshots
• Everything works in the built-in demo — try it for free

### 1.2 — 2026-08-28

NEW
• Trend detail: selectable 1 / 5 / 15 minute window — history now keeps 15 minutes
• Dutch and Norwegian localization — the app now speaks 10 languages

IMPROVEMENTS AND FIXES
• Pulse commands always release the bit, even if the connection drops mid-pulse
• Reliable reconnect after a failed connection attempt
• Empty or invalid addresses are flagged on the object instead of being misread
• Form validation for value limits, safer backup restore and many smaller fixes

### 1.1 — 2026-08-25

NEW OBJECT TYPES
• Pulse button — writes 1 and automatically 0 after one second
• Alarm with acknowledge — blinks while active, one tap to acknowledge
• Off / Auto / Manual mode selector
• Level bar with min/max limits
• Value trend — tap it to open a large chart with axes

IMPROVEMENTS
• 16-bit S7 values follow the S7 convention: WORD unsigned, INT signed
• Switching a group between LOGO! and S7 keeps analog signedness
• Alarms stay fully visible with Reduce Motion enabled
• Updated demo line — try the new alarm, level and trend objects without hardware

### 1.0 — 2026-08-24

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 2026-10-04.*