Prioritise Safety Logic and Muting Controls in MRO Sourcing

What happened

A newer category of multiloop or multifunction safety logic solvers has emerged to fill the gap between single-loop relays and full safety PLCs. These devices are available with IEC 61508 certification and can cover moderately complex safety instrumented functions without a full PLC project; watch whether vendors back claims with lifecycle support and certified proof-testing plans

Why the category manager should care

Treat multiloop solvers as a credible sourcing option where SIFs are distributed and PLC projects are uneconomic, because they reduce engineering overhead while creating spares and test dependencies

Key facts

• Designed to handle multiple I/O channels and voting architectures (e.g., 1oo2, 2oo3)
• Offered with IEC 61508 certification for SIL 2/3 usage in appropriate configurations

What happened

Muting functions allow material to pass protective fields without stopping production but are often implemented insecurely in practice. The IEC 62046 standard sets specific requirements (for dual independent signals, timing and distance rules) and the article highlights common gaps such as pallet-trigger workarounds; procurement should demand design evidence and installer competence for any muting application

Why the category manager should care

Treat muting implementations as a safety-critical scope item; require design verification and test evidence as part of acceptance and handover

Key facts

• Muting must be activated via at least two independent bridging signals per IEC 62046
• Standard limits maximum permissible clearance to prevent person entry during muting

What happened

A Melbourne manufacturer implemented a cloud-based Siemens PCS Neo and integrated MES to digitalise recipes and tank-farm control, which improved consistency and scaled output at that facility. The case shows demand for standardized I/O, barcode-based material controls and better traceability but is a single-site success and should be validated for broader APAC rollouts

Why the category manager should care

Use this as a reference case for RFQ requirements on integrator capability and spare availability, but verify local support and SLA coverage before scaling

Key facts

• Integration of cloud-based PCS Neo with Opcenter MES for recipe-driven manufacturing
• Reported operational uplift and a pathway to scale across additional tanks