Process Journal Pro
Lightweight PLC Data Logging

Log S7 PLC data to Excel — without the heavy historian.

Process Journal Pro is a simple Windows app for capturing S7 process values right at the machine. Point it at a non-optimized DB, choose the period, and export clean Excel workbooks automatically. Crash-resilient, operator-friendly, and priced for small teams.

Download for Windows See features
S7 (S7-1200/1500) support today · Excel output · Labels & preview

Connect fast

IP, rack, slot, DB, start, count, and type (REAL/INT/DINT). No server to maintain.

Excel-ready logs

Writes directly to .xlsx. Append new runs as separate sheets or create new files per session.

Crash-resilient

Streams to a small journal file while running and auto-recovers to Excel on restart.

Operator labels

Name channels inline (CSV) and preview the last values in a live table.

Simple by design

No databases, no servers, no licensing dongles. A single, focused tool.

Friendly pricing

Perfect for OEMs, small utilities, and consultants who don’t need a full plant historian.

OEMs & Machine Builders

  • Bundle with machines for acceptance testing
  • Field diagnostics & FAT/SAT logging

Rural Water & Small Utilities

  • Trend key setpoints & flows
  • Keep data locally, in Excel

Consultants & Integrators

  • Quick study runs without SCADA
  • Deliver clean CSV/Excel to clients

How it works

  1. Create a non-optimized DB with your values (array of REAL/INT/DINT).
  2. Enter PLC connection + offsets.
  3. Pick a save folder. Press Start.
  4. Stop to finalize an Excel workbook (or auto-recover if power is lost).

Process Journal Pro reads with snap7 and writes with openpyxl. It does not modify your PLC program.

Questions or feedback? Email hello@processjournalpro.com.