7
2
、
IO3-4
：
Controllable by software, maximum switching voltage of electric relay
is 220Vdc
，
250Vac
；
3
、
IO5
：
Optically coupled 1 input LED+, voltage range between IO5 and IO6 is
3-5.5V, maximum current is 50mA
；
4
、
IO6
：
Optically coupled 1 input LED-, voltage range between IO5 and IO6 is 3-
5.5V, maximum current is 50mA
；
5
、
IO7
：
Optically coupled 2 input LED+, voltage range between IO7 and IO8 is
3-5.5V, maximum current is 50mA
；
6
、
IO8
：
Optically coupled 2 input LED-, voltage range between IO7 and IO8 is 3-
5.5V, maximum current is 50mA
；
Chapter 2 Installation instructions
2.1 Appearance
