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
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