This module can support up to 15 buttons/reed switches or 8 LED buttons.

Module parameters
Input channels qty 16
Buttons 15
LED Buttons 8
Backlight voltage  3V
Power supply 11.5 … 27.5 V DC from CAN
Max current(24V) 45mA
Push-button/reed switches line recommended length 30m
Bus type CAN (4-wire)
Equipment installation type DIN-rail (EN 60715)
Case material ABS
Protection IP40
Temperature range -10 … +50 °C
Size 2U, 36x102x58 mm
Weight 75g