クイック回答
Connecting legacy PLCs to cloud ERP requires using an industrial gateway (like Modbus or OPC-UA) combined with a hardware data diode for secure, one-way data flow. Raw telemetry must be normalized at the edge to fix timestamp drift and batch count errors without causing production downtime.
ブログに戻る
|22 June 2026
The Legacy PLC ERP Integration Checklist: 5 Core Shop Floor Integration Points
Discover how to safely bridge your legacy PLC telemetry with modern cloud-based ERP systems using our step-by-step factory floor integration checklist without risking downtime.
i
iReadCustomer Team
著者
コンテンツなし
よくある質問
よくある質問
Why shouldn't you connect a legacy PLC directly to an ERP's SQL database?
Direct database connections overload legacy PLCs, causing performance issues. Without a middle gateway or broker to handle data queuing, any network disconnection can cause the PLC CPU to crash or lose critical manufacturing data permanently.
How does a hardware Data Diode secure a connected factory floor?
A hardware data diode uses optical fibers allowing data to transfer in only one direction (from OT to IT). Because there is no physical return copper or fiber path, external cyber threats cannot send destructive commands back into the factory network.
How do Modbus and OPC-UA compare for legacy PLC integration?
Modbus is highly compatible with nearly all legacy hardware and easy to set up, but lacks built-in security. OPC-UA offers robust end-to-end security, encryption, and rich data modeling, making it ideal for large-scale enterprise cloud integrations.
How do you solve batch-count telemetry drift in a cloud dashboard?
To resolve drift, configure the edge gateway to calculate and transmit the interval changes (deltas) instead of raw cumulative counts. Implement drop-detection logic to handle manual PLC counter resets without corrupting the historical database.
What is the safest way to execute a digital upgrade without risking factory downtime?
Start by backing up all PLC programs. Install gateways and physical cables only during scheduled weekend maintenance windows. Run read-only passive tests for 72 hours, and thoroughly validate all telemetry in an isolated staging sandbox before going live.
