The Siemens 3SK2611-3AA00 is a SIRIUS diagnostics display module designed to plug into the 3SK2 safety relay and the modular 3RK3 safety system, pulling diagnostics data off the system interface for local readout. It gives you a 4-key keypad, one display, and three status LEDs on a 96 mm wide face — enough to acknowledge faults and scroll through event logs without opening the panel door.
Environmental limits
Maximum installation altitude is 2 000 m above sea level — standard for industrial control gear without derating.