The IS420UCSCS2A is a Mark VIeS Safety Controller, an active-life-cycle dual-core controller designed for functional safety loops to achieve SIL 2 and SIL 3 capabilities, compliant with IEC 61508 standards. IS420UCSCS2A features a 1.6 GHz AMD G-Series dual-core microprocessor, 2 GB DDR3-1066 SDRAM with error correcting code (ECC), and a 128 GB Solid State Drive for storage, with no non-volatile SRAM. IS420UCSCS2A supports Simplex, Dual, and TMR redundancy configurations, enabling flexible deployment across various safety-critical applications from small industrial systems to large combined-cycle power plants. IS420UCSCS2A communicates with I/O modules via three on-board IONet ports (R/S/T) supporting simplex, dual, and TMR modes, and includes an ENET 1 port for EGD/UDH communications with ToolboxST PCs, HMIs, UCSCH1B Gateway controllers, and GE PACSystems products, along with read-only Modbus TCP Slave functionality and Black Channel communication between other Mark VIeS Safety controllers. Programming for IS420UCSCS2A is facilitated through ToolboxST software, supporting Function Block Diagram (FBD), Relay Ladder Diagram (RLD), and Cause and Effect Matrix, with configurable control logic execution frame rates of 10 ms, 40 ms, 80 ms, or 160 ms (synchronized across controllers in Dual and TMR setups). IS420UCSCS2A measures 168 x 150 x 55 mm (6.6 x 5.9 x 2.2 in) alone or 204 x 152 x 55 mm (8.0 x 6.0 x 2.2 in) with its mounting base, weighs 1,327 g (46.8 oz), and uses base-mounted installation with convection cooling. IS420UCSCS2A operates within an ambient temperature range of -40°C to 70°C (-40°F to 158°F) (with 25 mm clearance required), supports 95% non- condensing humidity, and accepts an input power of 18 to 30 Vdc (28 Vdc nominal) with a maximum power consumption of 30.8 W. IS420UCSCS2A is equipped with status LEDs (Power, Boot, Online, Ethernet link/activity, Diagnostics), IS420UCSCS2A is G3 compliant and certified for Hazardous Locations including Class 1, Div 2, Class 2, Zone 2, and ATEX (detailed ratings in GEH-6861), making IS420UCSCS2A suitable for safety-instrumented system (SIS) applications to mitigate risks in critical processes. | 
