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.

Siemens S7-300 Digital and Analogue I/O Modules

Expansion modules and accessories to support the Siemens S7-300 PLC range. Each S7-313 PLC CPU Base Unit may be expanded with up to 8 expansion modules. S7-314 CPU Base Units can accept a total of 4 expansion racks consisting of 8 expansion modules each.,All expansion modules share the following features:

Compact design
LED’s input signal status indication
Front panel connector for actuators or sensors. Connectors can be coded according to application, thus preventing the connection of an incorrect unit
No slot rules: the address of the input corresponds to the slot number
Modules may be configured and the parameters set using STEP 7 Lite software
Data is stored centrally. When a module is removed/replaced data is automatically sent to the new module, removing possible set up errors