Siemens SIMATIC S7-300 Digital Input SM 321 Module (6ES7321-1BH02-0AA0), 4V DC, optically isolated in groups of 16, status indicator LEDs, compatible with S7-300 CPUs & ET 200M stations, requires 20-pin front connector

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Siemens SIMATIC S7-300 Digital Input SM 321 Module (6ES7321-1BH02-0AA0), 4V DC, optically isolated in groups of 16, status indicator LEDs, compatible with S7-300 CPUs & ET 200M stations, requires 20-pin front connector Specification

Usage & Applications
Sensor connection, logic processing, machinery controls

Product Type
Digital input module (SM 321)

Number of Channels
16 Input Channels

Storage Temperature
-40 C to +70 C Celsius (oC)

Network Connection Methods
Direct connection via backplane bus interface

Power
3.5 Volt (v)

Dimension (L*W*H)
11.7 cm x 4.0 cm x 12.5 cm Centimeter (cm)

Weight
0.20 Kilograms (kg)

No. of Ports/Pins
20-pin front connector

Range
24 V DC Rated Input voltage

Power Supply
24 V DC

Material
Plastic

Size
40 mm width standard form factor

Height
12.5 Centimeter (cm)

Color
Industrial Grey / Dark Grey

Siemens SIMATIC S7-300 Digital Input SM 321 Module (6ES7321-1BH02-0AA0), 4V DC, optically isolated in groups of 16, status indicator LEDs, compatible with S7-300 CPUs & ET 200M stations, requires 20-pin front connector Trade Information

Minimum Order Quantity
1 Piece

Delivery Time
2 Week

About Siemens SIMATIC S7-300 Digital Input SM 321 Module (6ES7321-1BH02-0AA0), 4V DC, optically isolated in groups of 16, status indicator LEDs, compatible with S7-300 CPUs & ET 200M stations, requires 20-pin front connector

Expand your legacy instrumentation control with the high-reliability Siemens SIMATIC S7-300 Digital Input SM 321 Module (6ES7321-1BH02-0AA0). Purpose-built as a compact chassis add-on, this 40 mm wide module provides 16 digital input channels to safely interface standard mechanical switches, proximity sensors (BEROs), and limit switches with your control system. Operating at a nominal 24V DC threshold, it features built-in optical galvanic isolation (tested up to 500V DC) between the active field signals and the backplane. This layer entirely blocks voltage spikes, ground loops, and high-frequency electrical transients from corrupting your central logic operations.

The inputs accommodate standard IEC 61131 Type 1 characteristic curves, presenting a clean 1.2 to 4.8 millisecond firmware propagation delay to suppress mechanical contact bounce or chatter. It pulls a low 10 mA of current from the 5V DC backplane bus and houses a front-facing matrix of 16 vivid green status LEDs synchronized with each channel for immediate diagnostic tracking on the factory floor.

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