Choosing an HMI balances the information density the operator needs with the physical/environmental conditions of the panel. A wrong choice causes readability and maintenance issues.
- Screen size/resolution — data and graphics density to show
- Communication — same protocol as the PLC (PROFINET, Modbus, EtherNet/IP)
- Environment (IP) — touch type, temperature, vibration, washdown
- Software — engineering tool and PLC integration
Choosing the HMI and PLC from the same ecosystem (one software, one support line) markedly eases commissioning and maintenance.
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