What Are the Standards in IEC6 1131-2 Type 1/2/3 Sensors


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i bought an Isolated 8 Channel Digital Input (ISO1I813T ) and it has a pin that i have to select which type of input (sensor) i will be using. it says the types are IEC6 1131-2 Type 1/2/3. but the problem i don't know what are these types, and i couldn't find the detail explanation to it, like IEC's specification for these classifications or any explanation about what are these types and what the standard is. so could any body help me figure it out?

thank you.