Siemens 6ES7223-1PH32-0XB0 SIMATIC S7-1200 SM 1223 8DI/8DO Relay 2A Digital I/O Module

The Siemens 6ES7223-1PH32-0XB0 is a SIMATIC S7-1200 SM 1223 digital I/O module combining 8 digital inputs (24 V DC, sink/source) with 8 relay outputs rated 2 A each. It mounts directly on the S7-1200 backplane bus, adding mixed digital I/O to a compact CPU without a separate remote I/O station. The relay outputs switch both DC and AC loads up to 250 V AC.

Technical Specifications

Certifications & Standards

• CE
• CSA
• UL
• cULus
• FM
• RCM
• KC
• Marine approval

Selection Notes

The relay outputs on this SM 1223 variant switch AC loads up to 250 V and DC loads up to 30 V at 2 A per point, which a transistor-output DQ module cannot do. Pick this relay version when panel wiring already runs mixed AC/DC control circuits or drives small contactors and solenoid valves directly. Pick a transistor-output variant instead when switching speed matters: these relay contacts are rated for 10 million mechanical cycles but only 100,000 cycles at rated load. The 8DI/8DO channel count suits a compact I/O expansion next to the CPU without changing the backplane-bus interface used across the SM 1223 family.

Applications

Typical uses include expanding S7-1200 digital I/O on machine control panels, driving 24 V DC or up to 250 V AC field devices such as indicator lamps, small motor starters, and solenoid valves directly from the relay outputs, and reading 24 V DC sensor and pushbutton inputs in isolated groups of two.