Siemens 6ES7223-7AF50-0XB0 SIMATIC S7-1200 SB 1223 4DI/4DQ 200kHz Signal Board

The Siemens 6ES7223-7AF50-0XB0 is a SIMATIC S7-1200 SB 1223 signal board adding 4 digital inputs and 4 digital outputs at 5 V DC with switching frequencies up to 200 kHz, for use where the CPU's onboard IO is not fast enough for pulse counting or high-speed pulse output. It plugs directly onto the front of the CPU without consuming a mounting slot.

Technical Specifications

Certifications & Standards

• CE
• UL
• cULus
• RCM (formerly C-TICK)
• KC

Selection Notes

The 200 kHz switching frequency is what separates this board from the standard SB 1222/1221 signal boards: the CPU's onboard fast inputs top out lower, so this board is the choice when the application needs a high-speed counter or pulse-train output and there is no free CB/SM slot for a full IO module. The 0.1 A output rating keeps it limited to driving small relays, opto-couplers, or logic-level loads rather than field actuators directly.

Applications

Adds high-speed counting or PTO/PWM channels to a compact S7-1200 CPU for encoder feedback, flow meter pulse counting, or stepper/servo pulse-train control in machines with limited panel space.