Siemens SIMATIC S7-1200 Digital Output Module SM 1222, 8 Relay Outputs, 2 A, 5-30 V DC / 5-250 V AC, Screw Terminals, DIN Rail 6ES72221BF320XB0

In industrial automation, controlling actuators such as contactors, valves, or indicator lights requires reliable switching of both DC and AC loads. The Siemens SM 1222 digital output module provides eight relay outputs, each capable of handling up to 2 A, making it suitable for a wide range of control tasks in SIMATIC S7-1200 systems.

Who is it for

This module is intended for automation engineers and system integrators who need to expand the digital output capacity of a SIMATIC S7-1200 PLC. It is particularly useful when switching mixed-voltage loads or when galvanic isolation between channels and the backplane bus is required.

Main features

• 8 relay outputs with 2 A per channel (resistive load)
• Wide output voltage range: 5 V DC to 30 V DC, 5 V AC to 250 V AC
• Electrical isolation between channels and backplane bus, and between channels
• LED status indicator for each output
• Screw terminal connections for secure wiring
• DIN rail mounting for easy installation
• Switching frequency up to 100 Hz for resistive loads

Specifications

• Module type: Digital output module
• Series compatibility: SIMATIC S7-1200
• Number of digital outputs: 8
• Output type: Relay
• Output current per channel: 2 A (resistive load)
• Output voltage range (DC): 5 V DC to 30 V DC
• Output voltage range (AC): 5 V AC to 250 V AC
• Electrical isolation: Yes (between channels and backplane bus, and between channels)
• Short-circuit protection: No (external fusing required)
• Switching frequency (resistive load): 100 Hz
• Switching frequency (inductive load): 0.5 Hz
• Connection type: Screw terminals
• Mounting type: DIN rail
• Operating temperature (horizontal): -20 to +60 °C
• Power loss: Max. 4.5 W
• Status indicator: Yes (LED for each output)

Tips

When using this module with inductive loads, consider adding external suppression devices to protect the relay contacts and extend their service life. Ensure proper fusing for each output circuit as short-circuit protection is not integrated.