Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 98)

LT-4201TM/4301TM (Modular Type DIO)
98
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.