High Profile VS Low Profile
With different form factor, I/O modules can be classified to high profile and low profile. Basically, high profile and low profile modules that with same item number also have same I/O channel number. For example: I-8054 and I-8054W both has 8 DI and 8 DO. Except I/O channel number, other specifications could be different. You have to double check whether the specifications suit your application. For example: For I-8054W, its DI logic high level is +10~+50V. But for I-8054, it is +3.5~+30V.
The support list of MCU (Main Control Unit) and I/O expansion unit are: