Siemens 6ES7321-1BL00-0AA0 SIMATIC S7-300 SM321 Input Module 32-pt

The Siemens SIMATIC S7-300 SM321 (6ES7321-1BL00-0AA0) is a digital input module offering 32 channels for reading binary signals from field devices such as switches, sensors, and limit switches. This high-density module is essential for efficiently managing numerous discrete input