This is an old revision of the document!
The 426HSS is a 6 channel digital I/O module. The module has 6 channels which can be used as 10 Amp low side switching outputs. The 426HSS features a manual mode to allow operation of outputs without a functioning E-Plex connection.
Most E-plex solid state switching modules (366HMM, 436MMX etc) are high side switching- that is they supply battery voltage to a load when enabled. The 426HSS is low side switching, so the load would be connected to battery voltage, and then connected to negative via the module when enabled.