Siemens 6ES7522-5HF00-0AB0 SIMATIC S7-1500 DQ 8x230VAC/5A ST Relay Digital Output PLC I/O Module

The Siemens 6ES7522-5HF00-0AB0 is a SIMATIC S7-1500 digital output module, DQ 8x230VAC/5A ST (relay), with 8 relay outputs wired one per group and rated 5 A at 24-230 V AC/DC. It supports safety-related shutdown of load groups up to SIL1 per EN IEC 62061 and Category 2/PL c per EN ISO 13849-1, and it needs a front connector ordered separately.

Technical Specifications

Selection Notes

ST places this relay module in the Standard performance class with per-channel isolation and diagnostics, plus SIL1/Cat.2/PL c safety-related tripping from FS03 onward, which lets it act inside a safety shutdown path without a dedicated F-module. The relay contact accepts both AC and DC loads on the same channel (24-230 V AC or 24-120 V DC), unlike the Triac output module in the same rack family that is AC-only; pick this one when the load voltage type is mixed or when the 4,000,000-cycle relay life and 5 A switching capacity exceed what a solid-state output card offers. Where switching frequency above 2 Hz or silent operation matters more than raw current, the Triac-based DQ module is the better fit instead.

Applications

Switching mixed AC/DC loads such as contactor coils, solenoid valves, and indicator circuits up to 5 A per channel, including installations where the output group forms part of a SIL1/PL c safety function.