PLC Digital Input Module EM221

The S7-200 PLC range by Siemens achieves what many others cannot - powerful performance in a compact package. Its real-time response is fast, it features great communication options and has software that is simple and easy to operate. The compact modular design enables you to create a customised solution that isn’t overly large, but is flexible enough that you can add to it at any point in the future. Millions of stand-alone and networked applications around the world utilise the Siemens Simatic S7-200, and it's easy to see why.

A range of digital and analogue expansion modules to increase the I/O capacity of the S7-200 CPUs. A maximum of 2 modules can be used with S7-222, with a maximum of 78 I/O, up to 7 modules may be used with S7-224 and S7-226 CPUs, with a maximum of 128 I/O 248 respectively. The modules are available in 24Vdc or 85-245Vac powered versions, and include digital input, output and combined forms, plus analogue input, output and temperature sensor modules.

In addition to digital signals the S7-200 series can process analogue signals from sensors or actuators directly by using an analogue expansion module.