SIEMENS S7-300 PLC-6ES7321-1CH20-0AA0

The SIEMENS S7-300 PLC (Model: 6ES7321-1CH20-0AA0) is a reliable and compact automation solution designed for industrial applications. With a 48-125V DC rated voltage and a low power consumption of 4.3W, it ensures efficient performance in demanding conditions. Its dimensions (40x125x130mm) and lightweight design (200 grams) make it ideal for space-constrained installations, while the DIN-rail mounting guarantees easy setup. Featuring a 20-pin connection type and robust isolation of up to 1500V DC, it offers secure and seamless integration with other systems. The PLC operates in extreme environments, with a temperature range of -20C to +60C and humidity resistance up to 95%. Protected by an IP20 rating, it is built to withstand dust and small particle ingress. The unit also operates at a frequency of 50/60Hz, making it suitable for various automation tasks such as process control and equipment management.

Siemens 6ES7321-1CH20-0AA0 S7-300 Digital Input Module (SM 321)

16 DI, 48125 V DC, isolated, 1 20-pole

Supply Voltage

• Rated Value (DC): 48 V

• Permissible Range: 48 125 V DC

Input Current

• From backplane bus 5 V DC: max. 40 mA

Power Loss

• Typical: 4.3 W

Digital Inputs

• Number of Inputs: 16

• Input Characteristic Curve: IEC 61131, type 1

• Simultaneously Controllable Inputs:

  • Horizontal installation: up to 8 (040 C), up to 8 (060 C; 6 to Ue 146 V)

  • Vertical installation: up to 8 (040 C)

• Input Voltage:

  • Signal "0": 146 V to +15 V DC

  • Signal "1": 30 V to 146 V DC

• Input Current for Signal "1": typical 3.5 mA

• Input Delay (for rated voltage):

  • "0" "1": 0.1 3.5 ms

  • "1" "0": 0.7 3 ms

Cable Length

• Shielded: max. 1,000 m

• Unshielded: max. 600 m

Encoder Support

• 2-Wire Sensor: Yes, max quiescent current 1 mA

Interrupts / Diagnostics

• Diagnostic Function: No

• Diagnostic Alarm: No

• Hardware Interrupt: No

• LED Indicators:

  • Digital input status (green): Yes

  • Group error SF (red): No

Potential Separation

• Between channels: No

• Between channel groups (8 channels): Yes

• Between channels and backplane bus: Yes, via optocoupler

Isolation

• Tested with 1,500 V DC

Connection

• Required front connector: 20-pin

Dimensions

• Width: 40 mm

• Height: 125 mm

• Depth: 120 mm

Weight

• Approx.: 200 g

Technical Details 

FAQs of SIEMENS S7-300 PLC-6ES7321-1CH20-0AA0: