Overview
The 6ES7222-1HF21-0XA0 is a Siemens SIMATIC S7-200 EM 222 digital output module providing 8 relay outputs rated at 2 A per channel. It is designed exclusively for use with S7-22X CPUs and mounts directly on the CPU expansion bus.
Function & operation
This module adds eight relay outputs to an S7-200 base CPU. Each output switches up to 2 A, suitable for driving contactors, solenoids, and indicator loads. The relay contacts provide galvanic isolation between the load circuit and the PLC backplane, which is useful when mixing AC and DC loads in the same panel.
Applications
The EM 222 relay output module is used in small to medium machine automation, packaging lines, conveyor systems, and HVAC control panels where the S7-200 CPU serves as the controller. Its relay outputs handle both AC and DC loads up to 2 A, making it a flexible choice for mixed-voltage cabinets.