- Brand: Siemens
- Model: SIMATIC S7-300 Digital Input Module (SM 321)
- Type: 16-Channel 24V DC Digital Input Module
- Part Number: 6ES7321-1BH01-0AA0
- Technical Specs:
- Core Application: Reads binary process signals from switches, proximity sensors, relays, and pushbuttons, transferring operational state data to the S7-300 backplane bus.
- Number of Digital Inputs: 16 Inputs (Divided into 2 isolated groups of 8 channels each)
- Input Voltage Rating: 24 V DC (
- Input Characteristic Curve: Conforming to IEC 61131-2, Type 1
- Input Current for Signal "1": Typ. 7 mA at 24 V DC
- Voltage Thresholds:
- For Signal "0": -30 V to +5 V DC
- For Signal "1": +13 V to +30 V DC
- Input Delay Time: 1.2 ms to 4.8 ms
- Optical Isolation: Galvanically isolated from the backplane bus via optocouplers (Tested at 500 V DC)
- Cable Connection Length: Max. 1,000 m (Unshielded) / Max. 600 m (Shielded)
- Sensor Connection: 2-wire proximity sensors (BERO) supported
- Backplane Bus Current Consumption: Max. 10 mA
- Power Loss: Typ. 3.5 W
- Diagnostic / Status Indicators: 16 x Green channel status LEDs (indicating active signal states per channel)
- Compatible Systems: SIMATIC S7-300, ET 200M distributed I/O stations
- Structural Mounting Format: Direct screw attachment to standard SIMATIC S7-300 DIN mounting rails
Weight: 280 g
Dimensions: 40 x 125 x 120 mm
Country of Origin: Germany
HS Code: 8538.90.91