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I'm also curious about this. In Device DDT we can find a structure for the hardware used for IO scanning, in my case I use the CPU but it should look similar to the NOC I guess. In there we have DIO control and health bits which are called 513-640 and it say 1 BIT per DIO. These numbers corresponds nicely with the numbers in the DTM list which starts at 513. (lower numbers are used for RIO).
This may be the answer your question but then there is one more layer to it. In each device we can have several requests and each request also have it's own connection bit. At least for modbus TCP. Those bits are listed read only in the request row and also if you click on the device list in DTM browser list. These bits are called 1 and up. But how can we see/control these bits? Are they for health or control purposes or both?
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