Redundant Power Inputs
MOXA EDS-508 has two DC power inputs located on its top panel. For detailed instructions on how to connect the power wires to the terminal block connector, see the Wiring the Redundant Power Inputs section from Chapter 3.
From the user’s point of view, the function of the redundant power inputs is quite straightforward. Both inputs can be connected simultaneously to live DC power sources. If one power source fails, the other live source acts as a backup, and automatically supplies all of MOXA EDS-508’s power needs.
Relay Contacts
MOXA EDS-508 has two Relay Contacts located on the top panel. For detailed instructions on how to connect the Relay Contact power wires to the 6-pin terminal block connector, see the Wiring the Relay Contact section from Chapter 3.
The two sets of relay contacts of the 6-pin terminal block connector are used to detect user-configured events. The two wires attached to the Fault contacts form an open circuit when a user-configured event is triggered. If a user-configured event does not occur, the Fault circuit will be closed.
A typical scenario would be to connect the Fault circuit to a warning light located in the control room. The light can be set up to switch on when a fault is detected.
4-2 MOXA EtherDevice Switch Hardware Installation Guide
