AB analog input cards are set up as 0-10 vdc, +/- 10 vdc, 0-20 ma or 4-20 ma. If you have a 0-5 vdc signal, use 0-10 vdc analog input then scale the input to compensate. If 0-5 represents 0-100 PSI then scale your input for 0-200 PSI result or 0-2048 high low reference using the SCP instruction.
Consider the SNAP Ethernet I/O system from Opto 22. With built-in EtherNet/IP, an extensive range of analog input modules, and lifetime guarantee (plus free training, software, technical support, and pre-sales engineering assistance), SNAP I/O can deliver scaled, conditioned signals to your PLC in any engineering units you desire. Plus, they are higher resolution than the 8-bit resolution noted above (0-4095).
If you're going to consider remote i/o, you might also want to check out Acromag's 962EN-6006, 6ch Differential, 16 Bit, AI-V Ethernet IP module. Model 964EN-6012 is a 12ch Single-ended 16 Bit, AI-V Ethernet IP remote i/o module. App notes are freely available for SLC, Compact and Control Logix platforms.
These units also support PCCC (ie; needed for SLC processors) and Modbus TCP/IP protocol as well.