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🧠 What Are SIMATIC S5 HMIs?

The 6AV36 / 6AV37 series HMIs are operator panels and terminals used for:

• 🖥️ industrial process monitoring
• ⚙️ human-machine interaction
• 🔧 parameter management and operational commands
• 🚨 alarm signalling

👉 They were designed for architectures based on SIMATIC S5 systems and early S7 configurations.

⚙️ Main Technical Features – S5 HMIs

These devices are characterised by:

• monochrome or low-resolution displays
• integrated physical keypads
• serial communication (RS232 / RS485) or PROFIBUS
• robust hardware architecture
• configuration via legacy software

👉 Although these technologies are now outdated, they remain operational in many industrial plants.

⚠️ Production Continuity: Critical Issues Affecting Legacy HMIs

S5 HMIs represent one of the most critical components in older industrial plants.

Over time, several issues may arise:

• ❌ loss of display contrast
• ❌ depleted backlighting
• ❌ worn keypads
• ❌ power supply issues
• ❌ contact oxidation
• ❌ communication errors with PLCs

👉 Replacement is not always straightforward, making proper maintenance essential.

🛠️ E-Repair Services for Siemens Legacy HMIs

E-Repair offers a complete package of services designed to support production continuity:

• 🔧 Component-level repair in its in-house laboratory
• ♻️ Electronic remanufacturing with zero-hour reset
• ⚡ Advance replacement service with a remanufactured unit
• 🧠 HMI data backup and recovery
• 🧰 On-site and remote technical support
• 🧼 Technological cleaning with biodegradable solvents

👉 Services are carried out in compliance with:

• ISO 14001 – Environmental Management System
• ISO 14064-1 – Organisation Carbon Footprint
• BS 8001:2017 and AFNOR XP X30-901:2018 – Circular economy standards

🏭 Typical Applications of SIMATIC S5 HMIs

These devices are still used in:

• packaging lines 📦
• food-processing plants 🍝
• older automated machines
• material-handling systems
• chemical plants 🧪
• legacy production lines

👉 These are environments where the complete replacement of the existing system has not yet been carried out.

🔍 MLFB Product Code Prefixes for SIMATIC S5 HMIs – 6AV36xx / 6AV37xx Series

Within the 6AV36xx and 6AV37xx families, Siemens identifies operator panels used in SIMATIC S5 systems.

This classification is essential for:

• correctly identifying the devices
• structuring the technical catalogue
• creating dedicated SEO pages
• planning maintenance or retrofit operations

🔹 6AV36xx – SIMATIC S5 HMIs

This family includes operator panels and HMI terminals for S5 systems.

Key features:

• dedicated industrial operator interfaces
• integration with legacy Siemens systems
• use in legacy architectures

▪ 6AV36xx sub-prefixes

• 6AV3607 – basic operator panels
• 6AV3617 – S5 / early S7 operator terminals
• 6AV3627 – panels with integrated keypads
• 6AV3637 – process monitoring interfaces
• 6AV3647 – advanced operator panels
• 6AV3671 – industrial HMI terminals
• 6AV3672 – machine-control panels
• 6AV3673 – local monitoring systems
• 6AV3674 – industrial operator interfaces
• 6AV3678 – production-line terminals
• 6AV3688 – highly robust industrial panels

👉 🔗 Link: 6AV36xx page – S5 HMIs

🔹 6AV37xx – Advanced SIMATIC S5 HMIs

This family includes advanced operator panels for SIMATIC S5 systems.

Key features:

• enhanced operational capacity
• use in complex industrial plants
• advanced monitoring functions

▪ 6AV37xx sub-prefixes

• 6AV3717 – operator panels with monitoring functions
• 6AV3727 – terminals for parameter management
• 6AV3737 – interfaces for data visualisation
• 6AV3747 – advanced panels for industrial applications
• 6AV3757 – HMI terminals for complex environments

👉 🔗 Link: 6AV37xx page – advanced S5 HMIs

🧠 Positioning Within the Siemens HMI Range

• 6AV36 / 6AV37 → SIMATIC S5 HMIs (legacy)
• 6AV3 / 6AV4 → first-generation SIMATIC S7 HMIs
• 6AV6 → advanced HMIs
• 6AV2 → modern HMIs (Basic, Comfort, Unified)

👉 S5 HMIs represent the earliest generation within the range.

📌 Conclusion

The SIMATIC S5 HMIs – 6AV36xx / 6AV37xx product code prefixes still represent critical components in many existing industrial plants.

Ensuring their proper operation means:

• keeping legacy systems operational
• reducing machine downtime
• effectively managing the technological transition

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