Part Number: 2840A79G05 | Brand: Emerson / Westinghouse Ovation Q-Line Series | Made in USA2840A79G05 is the latest upgraded high-efficiency universal isolated digital output card of QBO series, specially optimized for low power consumption and wide ambient fluctuation working conditions, perfectly matched with servo power board 2840A78G01 to constitute complete QSD servo control rack for thermal power boiler, steam turbine DCS, petrochemical and pulp & paper automation control cabinets.This successor model inherits full pin-to-pin compatibility with former G01/G02/G03/G04 variants for direct hot-swap replacement without DCS program or rack configuration modification. It adopts optimized low-loss PCB layout with full three-proof conformal coating and upgraded multi-stage composite EMC surge suppression circuit, realizing adaptive automatic voltage matching instead of manual jumper setting used on G04 series.Core applicable scenarios cover field intermediate relay drive, small-size solenoid valve on-off control, cabinet interlock logic signal output and low-power auxiliary equipment switching for power plant auxiliary control loops and chemical process interlock system.

The module supports automatic adaptive working voltage ranging from 18VDC up to maximum 60VDC without onboard jumper adjustment, eliminating manual voltage configuration required by earlier G04 model. Single channel continuous resistive output current is fixed at 190mA per channel, and the total aggregated output current of the entire module is limited within 2.8A to guarantee stable long-term loaded operation. Its output structure is isolated open-collector dual-mode sinking and sourcing digital output design to satisfy diverse field wiring requirements.

Power is entirely supplied by Ovation standard rack backplane +5VDC and +24VDC shared bus, no extra external auxiliary field power source needs to be arranged for module operation.

Reinforced dielectric isolation between each output channel and internal backplane bus reaches above 1000VAC for insulation safety. Every single channel is equipped with independent overcurrent and short-circuit automatic cut-off protection circuit together with integrated TVS plus RC combined anti-surge components to restrain field instantaneous surge interference effectively. Front panel carries multi-color LED indicator lights: steady green light indicates normal module power supply, solid amber stands for valid channel output status, flickering amber light corresponds to overloading or short-circuit fault on relevant output channel for quick on-site troubleshooting.

Rated working ambient temperature range is from 0℃ to +60℃ for indoor control cabinet fixed installation; permissible storage temperature covers -40℃ up to +85℃ for spare part stock and long-distance transportation. Relative operating humidity keeps between 5% and 95% non-condensing range, full PCB conformal coating protects internal circuits against damp, dust and corrosive gas inside complex industrial cabinet environment.

Overall outer dimension maintains unified cabinet size same as all previous G01~G04 versions: 133mm in length, 82mm in width and 16mm in thickness. Net weight of the module is approximately 375g, slightly lighter than G04 due to optimized component miniaturization design.It follows standard Ovation Q-series plug-in rack mounting specification with hot-swappable structure allowing online replacement without system power down; optional transition base accessory supports DIN rail retrofit installation for reformed old control cabinets. Field signal wiring connects via side-mounted screw terminal block, rear golden-plated edge connector accomplishes reliable docking with rack internal backplane bus. Outer casing adopts black flame retardant ABS material with reserved heat dissipation slits and complies with industrial CE safety certification standard.

First prominent advantage lies in auto-adaptive 18~60VDC wide-range voltage design which cancels PCB jumper switching operation of G04, greatly simplifying on-site commissioning and avoiding misconfiguration risks caused by improper jumper setting. Second, upgraded low power consumption component layout effectively reduces module self-heating and improves long-term operational stability under high-density cabinet wiring environment. Third, full hardware interchangeability with all prior generation 2840A79Gxx modules enables direct plug-and-play replacement during equipment maintenance without any control logic download or parameter modification in DCS host system. Fourth, further enhanced multi-level EMI filtering circuit strengthens anti-interference performance to adapt complicated mixed high-low voltage dense wiring cabinet occasions commonly seen in power and chemical industry field sites.

Original genuine Emerson US manufactured product with formal CE industrial certification. Standard factory limited warranty covers 12 months against original manufacturing defects under specified normal operating environment and installation conditions.