Electrician Red Seal · Question
During a system upgrade, an electrician needs to replace an obsolete HMI with a new one. The new HMI requires a different communication protocol (Ethernet/IP instead of RS-485 Modbus) to interface with the existing PLC. What is the most critical first step to ensure compatibility?
Before replacing any major components or rewriting code, the electrician must first confirm the existing PLC's capabilities. If the PLC processor can support Et
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Question: During a system upgrade, an electrician needs to replace an obsolete HMI with a new one. The new HMI requires a different communication protocol (Ethernet/IP instead of RS-485 Modbus) to interface with the existing PLC. What is the most critical first step to ensure compatibility?
Answer options:
- Replace the PLC with a newer model that supports Ethernet/IP. ✅ Verify that the existing PLC's processor module supports Ethernet/IP or can be upgraded with a communication module.
- Rewrite the entire PLC program to adapt to the new HMI.
- Install a protocol converter between the HMI and the PLC.
Correct answer: Verify that the existing PLC's processor module supports Ethernet/IP or can be upgraded with a communication module.
Explanation: Before replacing any major components or rewriting code, the electrician must first confirm the existing PLC's capabilities. If the PLC processor can support Ethernet/IP directly or via an add-on module, it's a more efficient solution than full replacement or adding a protocol converter, both of which might be necessary if direct support is not possible.
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