Here's a breakdown of the product code:

6ES: This is the prefix used for Siemens products.

7321: This code indicates that it belongs to the S7-300 series.

1FF01: This code refers to the type and functionality of the module.

0AA0: This code represents the version, revision, and additional features of the module.

The "1FF01" code refers to a 16-channel digital input module (DI), which means it is used to read binary signals from external devices or sensors. Each channel can be used to monitor the status (ON/OFF) of a particular input signal.

Siemens Plc module

6ES7412-1XJ07-0AB0

6ES7412-5HK06-0AB0

6ES7412-2EK07-0AB0

6ES7414-2XK05-0AB0

6ES7414-2XL07-0AB0

6ES7414-3XM05-0AB0

6ES7414-5HM06-0AB0

6ES7414-3EM07-0AB0

6ES7414-3FM07-0AB0