Adquiring analog and digital signals with PCI6143

Hi, I am using a PCI6143, that is a simultaneos adquiring signals to reading AC voltages and currents. Now I need to read an aditional unmoduled IRIGB signal (see fig or. ), but I do not have analog inputs availables. Is possible to read thois kind of signal (0 or 5 Volts) using digital input, like a wave form (value& time)? if the answer is yes, is this signal synchroinized (simultaneus reading) with the analog signals reading?

Thanks in advance