Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 106)

LT-4201TM/4301TM (Modular Type Analog)
106
WARNING
UNINTENDED EQUIPMENT OPERATION
Do not connect wires to unused terminals or terminals marked “Not Connected (N.C.)”.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.