How to Choose an Industrial HMI Panel: A Complete Buyer's Guide

Step 1: Choose the Right Screen Size

HMI screen size affects readability, operator ergonomics, and cost. Match screen size to viewing distance and complexity:

• 4.3" – 5.6" — compact machines, limited panel space, simple on/off control
• 7" – 10" — standard machine HMI; enough space for status, alarms, and basic trends
• 12" – 15" — multi-axis machines, production lines; full process overview
• 18" – 21.5" — large panel interfaces, SCADA-like overviews, multi-screen dashboards

Step 2: Confirm IP Rating for Your Environment

• IP65 — front panel sealed against dust and water jets; standard for most manufacturing
• IP67 — full immersion to 1m; needed for food processing and washdown areas
• IP69K — high-pressure steam cleaning; required in dairy, beverages, and meat processing

Step 3: Verify PLC Protocol Compatibility

The HMI must speak the same protocol as your PLC. Most Cermate HMI panels support 200+ PLC drivers including:

• Siemens S7 (MPI, Profibus, Ethernet)
• Allen-Bradley (DF1, EtherNet/IP)
• Mitsubishi (FX, QJ71)
• Delta, Fatek, Unitronics, Schneider, and more
• Modbus RTU and Modbus TCP (universal)

Step 4: Check Operating Temperature

Standard HMI panels operate 0°C–50°C. If your environment is hotter (steel plant, outdoor summer) or colder (cold storage, outdoor winter), select a wide-temperature model rated to −20°C–60°C or beyond.

Step 5: Consider Software and Connectivity

• Does it support data logging to USB or SD card?
• Can it send email alerts or SMS alarms?
• Does it support MQTT or cloud connectivity for IIoT?
• Is offline recipe management available?

TSL Automation's Cermate HMI range covers all screen sizes from 4.3" to 21.5" with IP65/IP67 ratings and 200+ PLC drivers. Contact us for a recommendation matched to your exact application.