The

is a communications processor (CP 343-1) designed to connect a SIMATIC S7-300 PLC to an Industrial Ethernet network. It supports various communication protocols and network services. 

• Product Type: Digital Input Module SM 321.
• System Compatibility: Designed for use with the Siemens SIMATIC S7-300 automation system.
• Number of Inputs: 32 digital input channels.
• Input Voltage: 24 V DC (permissible range 20.4 V to 28.8 V DC).
• Isolation: The inputs are isolated in groups of 16 from the backplane bus, which helps protect against electrical interference and noise, ensuring reliable operation in harsh industrial environments.
• Connectivity: Features a single 40-pole front connector for signal transmitters.
• Input Type: Suitable for switches and 2-/3-/4-wire proximity switches (BEROs).
• Input Delay: Has a low input delay, typically between 1.2 ms and 4.8 ms.
• Status Display: Includes a green LED indicator for each channel to monitor the status at a glance.
• Mounting: Designed for standard DIN rail installation in a control cabinet.
• Durability: Robust design built to withstand typical industrial conditions like mechanical shock, vibration, and temperature fluctuations