Crushing season in Far North Queensland typically runs from June through to November or early December. Mills operate around the clock during this period, and every day of downtime means cane that doesn't get processed. Pre-season preparation is standard practice for mechanical maintenance. But the automation systems that control the process often get overlooked.
What's at Stake
A sugar mill is a complex operation with automation systems controlling everything from cane transport and shredding to boiler management, evaporation, crystallisation, and centrifuging. These systems rely on PLCs, HMIs, VFDs, and DCS platforms, many of which have been in service for years.
If a PLC fails during crushing and nobody has a backup of the program, you're not looking at hours of downtime. You're looking at days or weeks while someone reverse-engineers or rebuilds the control logic. At the height of crushing, that's a significant hit to throughput.
The Off-Season Risk
Here's the part that catches people out. The biggest risk period for battery-dependent PLCs is actually the off-season, not during crushing.
Most older PLCs use battery-backed memory. The battery only drains when the PLC is powered off. During crushing, everything runs around the clock, so the battery isn't under load. But during the December-to-May maintenance period, equipment gets shut down for months. That's when batteries fail, and that's when programs get lost.
Combine this with FNQ's heat and humidity - both of which shorten battery life - and you've got a real risk window for seasonal equipment.
Mills also do significant maintenance and modifications during the off-season. Drive parameters get changed, PLC programs get tweaked, HMI screens get updated. If the backup is from two seasons ago, it doesn't reflect the current state of the system.
What Should Be Backed Up
A complete backup for a sugar mill should cover:
- PLC programs - every controller on site, including auxiliary systems like water treatment, conveyor controls, and boiler automation
- HMI project files - operator interface screens for all touchpanels
- DCS configurations - if you're running a distributed control system
- VFD parameters - drive settings for all variable speed drives
- Network configurations - managed switch settings, IP addressing
- Instrument calibration data - sensor scaling and configuration
Timing
The best time to do a comprehensive backup is 2-4 weeks before crushing starts. This captures any changes made during maintenance and gives you time to verify the backups before the season begins. Steam trials typically happen in the weeks before first cane, which is a natural checkpoint.
If modifications were made during the season (and they always are), do another backup at the end of crushing before everything gets shut down.
The Broader Picture
It's not just the mills themselves. The cane railway signalling systems, pump stations, water treatment plants, and auxiliary processing facilities all have automation systems that need the same attention.
With the closure of the Mossman Mill in 2025, the remaining FNQ mills carry greater responsibility for the region's cane processing capacity. A major automation failure at any of them during crushing season would have ripple effects across the supply chain.
Related Services
- HMI & PLC Backup - comprehensive backup and documentation services
- PLC Software Services - programming, backup, and configuration
- SCADA & Data Logging - monitoring and logging for process operations
We provide industrial automation backup services across the sugar-producing regions of FNQ, from Innisfail and Tully to the Atherton Tablelands. Get in touch to schedule a pre-season backup.