Product Description:

The 3DO650 relay output module is manufactured by B & R Automation for the System 2005 Controllers series. Installed alongside the CPU, it converts low-level control signals into field-ready contact closures so that solenoids, contactors, and indicator lamps can be switched directly from the rack. This arrangement allows the controller to interface with external devices that require isolated switching rather than logic-level outputs.

Each of the module’s four output groups can carry up to 8 A, giving a total load capacity of 32 A across all channels. Within those groups, the unit provides 16 contacts with a normally open relay design, so every channel remains open when de-energized and can source or sink up to 2 A. The nominal control levels are 120 VAC / 24 VDC, while the relays withstand line potentials as high as 144 VAC or 30 VDC and can deliver up to 300 VA / 90 W of resistive load. A starting inrush of 12 A per channel is acceptable, provided the repetition rate stays within the mechanical limit of 10 Hz. Gold-plated contacts limit stiction, and the minimum switching threshold is 0.1 mA at 0.1 VDC, allowing reliable signaling for diagnostic circuits.

The relay coil is insulated to 2000 VAC / 1 min, maintaining clearance between control and power domains on the backplane. Contact chatter is limited by a typical energizing delay of 5.6 ms and a typical release delay of 2.5 ms, which supports orderly sequencing in time-critical interlocks. Silver alloy contacts hold resistance to 100 mΩ, so voltage drop remains small when the outputs drive low-power sensors. Because the contact rows are galvanically separated, low-level signals and higher-energy loads can share the same card without crosstalk.