The OP5311 is one of a range of signal conditioning modules for the OP5000 FPGA I/O system from Opal-RT Technologies and Third Party I/O. It allows up to 16 digital signals to be input through a single module. Given that both the OP5110 and OP5210 carrier can accommodate up to two mezzanine modules, it allows up to 32 signals to be captured per carrier. Several carriers can be connected to a single board slot on an RT-LAB simulator via the OP5110 or OP5120 I/O interface for very high channel counts.

The OP5311 features an on-board signal conditioning to convert external voltage levels to TTL, as well as provide an over-voltage protection through opto-isolation.