The 6ES7321-1BH82-0AA0 is a SIMATIC S7-300 digital input module (SM 321) providing 16 optically isolated inputs for 24V DC signals. It accepts 2-wire sensors and has a permissible quiescent current of up to 1.5 mA for such sensors. The input voltage range for a logic 1 is 13 to 30V DC, and for a logic 0 it is -30 to +5V DC. The module is designed for an expanded temperature range, though the exact extended limits are not listed in this record.
The 16 inputs are isolated as one group of 16 from the backplane bus via optocouplers, with 500 V DC isolation tested between channels and the backplane bus.
Electrical characteristics
Typical power loss is 3.5 W. The module draws up to 10 mA from the 5V DC backplane bus and up to 25 mA from the load voltage L+ (without load). Input delay from 0 to 1 is between 1.2 ms and 4.8 ms. The module supports unshielded cable runs up to 600 m and shielded runs up to 1,000 m. All 16 inputs can be driven simultaneously at up to 60 °C ambient, with a typical input current of 9 mA at 24V DC.