Serial ports | Module type | I/O | ||||
---|---|---|---|---|---|---|
RS-422 | RS-232 x2 | RS-232 x3 | RS-232 x4 and more | I/O module | Digital in | |
I-7521D |   |   |   |   |   |   |
I-7522AD |
|
  |   |   |   |   |
I-7522D |   |
|
  |   |   |   |
I-7523D |   |
|
|
  |   |   |
I-7524D |   |
|
|
|
|
|
I-7527D |   |   |
|
|
|
|