The 621-9931 I/O Power Supply Module provides
8 amps of +5VDC for the I/O logic circuitry in
the rack. It also supplies 600mA of ?15VDC power for special-function I/O and option module operation.

NOTE
The 621-9934C replaces the 621-9931 5A I/O Power Supply Module (115/230VAC).