The SFD's I/O were optically isolated. The Compax3 has sinking inputs (24V, max. 10mA) and sourcing outputs (24V, max. 100mA).
The Analog monitor outputs on the Compax3 are -10V to +10V, not +/-5V as on the SFD.
OLD MODEL REPLACEMENT
If you have any questions, please call Parker EMN's applications department, at 800-358-9070.