Siemens SIMATIC S7-1200 SM 1223 Digital Input/Output Module, 16 DI 24V DC, 16 DO Relay, 2A 6ES7223-1PL32-0XB0

Equipped with 16 digital inputs and 16 relay outputs, the Siemens SM 1223 6ES7223-1PL32-0XB0 delivers robust industrial control in a compact DIN-rail module. Relay outputs switch up to 2 A per channel, handling loads up to 250 V AC or 30 V DC, making it ideal for direct actuation of valves, contactors, and small motors.

Overview

Part of the SIMATIC S7-1200 family, this signal module expands the I/O capacity of any S7-1200 CPU. The 16 digital inputs accept 24 V DC sink/source signals conforming to IEC 61131-2 Type 1, while the 16 relay outputs are organized into two potential groups for flexible power distribution. Galvanic isolation between channels and backplane bus ensures reliable operation in noisy industrial environments.

What stands out

• 16 digital inputs (24 V DC, sink/source) and 16 relay outputs (2 A per point)
• Relay contacts rated for 30 V DC / 250 V AC, suitable for mixed-voltage loads
• Two isolated potential groups for outputs simplify wiring and fault isolation
• Low backplane power consumption of max. 4.5 W
• IP20 protection for control cabinet installation
• Operating temperature range 0 °C to 50 °C in horizontal mounting

Technical details

• Module type: Digital input/output module
• Series: SIMATIC S7-1200
• Number of digital inputs: 16
• Input voltage type: DC
• Input voltage level: 24 V DC
• Input type: Sink/Source (Type 1 according to IEC 61131-2)
• Number of digital outputs: 16
• Output type: Relay
• Output current per relay: 2 A
• Output voltage range (relay): Max. 30 V DC / 250 V AC
• Isolation: Yes, between channels and backplane bus
• Power consumption (from backplane): Max. 4.5 W
• Operating temperature: 0 °C to 50 °C (horizontal mounting)
• Mounting type: DIN rail
• Compatibility: SIMATIC S7-1200 CPUs
• Short-circuit protection (outputs): No (external fusing required)
• Degree of protection: IP20
• Number of potential groups (outputs): 2

Our verdict

A reliable and versatile I/O expansion for S7-1200 systems, the SM 1223 combines high-density digital inputs with rugged relay outputs, making it a practical choice for automation projects requiring direct control of AC or DC loads.