There are some potential disadvantages to human-machine interfaces (HMIs) that should be considered when deciding whether to use one:
Incorrect operation: Operators may make mistakes when using an HMI, such as entering the wrong command or failing to notice an alarm. This can cause problems with the process being controlled.
Additional costs: Implementing an HMI may incur additional costs because it requires the purchase and installation of the HMI itself and other related hardware and software.
High complexity: Some HMIs can be complex, which can make them difficult to use or require additional training for operators.
