Previously, I had serial columns about control LAN.

Many control LANs employ a master/slave method.

In this method, when multiple devices, equipment, software, systems, etc. work in cooperation, one of them is the side that manages and controls, and the other is the side that is controlled.

The controlling side is called the "master" and the controlled side is called the "slave".

In the English-speaking world, there seems to be a lot of controversy over whether to use the words "master and slave".

As a "controller engineer" myself, I find this controversy only discomfort.

It's a strange story like Nagoya's specialty "Miso Nikomi Udon" being called "a discriminatory term for people with brain disorders."

This "Miso Nikomi Udon" is a true story. If you are interested, please google it.

That aside.

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It seems that alternative terms such as "primary/secondary", "primary/replica", "parent/child" and "manager/worker" have been proposed.

My proposal is

"Master/Maid"

That's my only choice.