Can I map I/O for setpoint output relay for a HI 4050?

The HI 4050 does not have actual output relays, so you cannot map to an actual relay.  The HI 4050 has a DIO option that switches voltage and with that you can control a relay.  You can map the output from the setpoint to another location, like a network output location to be transferred to the PLC, or a digital output if you have the Digital Input/Output (DIO) option.

Using mapping Boolean equations you can produce light sequences and application control.
The attached write up will get you started.  Then you can use mapping to coordinate the relays to operate fill operations, warnings, or many other application assistance.