PieeerU

See ladder logic and device states at the machine. Read supported PLCs or import CSV files on iPhone and iPad—read-only by design.

When equipment stops, you need a clear view of the ladder and device states—right where the machine is.

PieeerU is a read-only mobile PLC viewer for maintenance work. It helps you view PLC programs and device states clearly on iPhone and iPad, even where opening a laptop beside the control panel is impractical.

Open the Program Part you need and check the states or values of devices such as X, Y, M, D, T, and C. Capture the screen and share it with your maintenance team or equipment supplier so they can see the stopped position and signal conditions instead of relying on a phone description.

Key features

• Read programs from supported PLCs and display them as ladder diagrams
• Import CSV files exported from GX Works or GX Developer
• Apply comment files to make device meanings easier to understand
• Test PLC connections and monitor device states
• View and manage individual Program Parts
• Save and restore your work in .plv files
• Explore the workflow with the built-in demo PLC—no hardware required

Read-only by design

PLCViewer does not write to the PLC, force devices ON or OFF, change RUN/STOP state, or edit PLC programs. It is focused on helping you see, verify, and communicate what is happening.

Try the core workflow for free

The free version includes the demo PLC, connection testing, small CSV ladder viewing, limited comment application, and X/Y device monitoring. PRO removes limits on import size, comments, PLC readouts, Program Parts, saves, and other listed features.

Designed for

• Factory maintenance and equipment-management teams
• Technicians who need a quick PLC view at the control panel
• Teams that need to share accurate equipment conditions remotely
• Anyone looking for a read-only mobile PLC tool

This is not an official Mitsubishi Electric app. Confirm supported PLCs, connection methods, and displayed content before use. Refer to each manufacturer's official documentation for PLC and engineering-software settings and specifications. Terms of Use (Apple Standard EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/