Siemens SM 1221 Series Digital I/O Module for Use with S7-300 Series, Digital, Digital, 24 V

Want to streamline the setup of your automated factory, data acquisition and medical imaging applications? With its 16 inputs, this Siemens digital input module minimises clutter and makes the most of available space. Link the unit to switches and proximity sensors to deliver reliable messages to your S7-300 PLC. Thanks to the channel-granular wire-break function, you can conveniently pinpoint problems when they crop up, for quick maintenance and minimal downtime. Galvanic isolation between the channels and the backplane bus boosts electrical safety and prevents damage. Programmable delays and diagnostics let you customise the module for your system.

• Performs without a glitch in temperatures up to +60°C when fixed in a horizontal position
• 24V DC supply voltage for use with standard power supplies
• Light weight of 200g adds minimal strain to your system

Yes, it has integrated LED status indicators and an alarm that sounds when something goes wrong.

It's a small unit, measuring only 40 (W) x 125 (H) x 120mm (D). This makes it an easy fit in limited spaces.