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Siemens 6ES7321-1BH02-0AA0 Simatic S7-300, Digital Input SM321

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Siemens 6ES7321-1BH02-0AA0 Simatic S7-300, Digital Input SM321

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€502,15
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Siemens 6ES7321-1BH02-0AA0 Simatic S7-300, Digital Input SM321

Siemens 6ES7321-1BH02-0AA0 SIMATIC S7-300 Digital Input Module SM 321, 16DI, 24V DC

Optically isolated digital input module for S7-300 PLC systems

Overview

This is a Siemens SIMATIC S7-300 Digital Input module SM 321, 6ES7321-1BH02-0AA0, an optically isolated I/O module providing 16 digital inputs at 24V DC. Conforming to IEC 61131-1 (Type 1) input specifications, it acquires digital signals from field devices such as sensors and switches, with optocoupler isolation between the input channels and the backplane bus protecting the PLC system from electrical noise and voltage transients.

Key Features

  • Optical isolation: Optocoupler isolation between input channels and the backplane bus protects against electrical noise and voltage spikes, preserving signal integrity.
  • 16 digital inputs, group-isolated: All 16 channels isolated together as a single group, suited to standard sensor and switch wiring.
  • Fast signal recognition: Input signal recognition time of 1.2 to 4.8 ms, with reliable operation across a 20.4–28.8 V input voltage range.
  • 2-wire sensor support: Compatible with 2-wire sensors, with a quiescent current rating of 1.5 mA.
  • Status LED diagnostics: Per-channel LEDs give quick visual confirmation of input signal state for fast troubleshooting.
  • Long cable run support: Rated for cable lengths up to 1,000 m shielded or 600 m unshielded.

What's Included

Model Function Qty
SM 321 (6ES7321-1BH02-0AA0) 16DI digital input module, 24V DC 1

Technical Specifications

Inputs: 16 digital inputs, 24V DC, isolated as one group of 16.

Connector: 1x 20-pole front connector (required, ordered separately).

Current draw from backplane bus (5V DC): Max. 10 mA.

Power loss: Typ. 3.5 W.

Cable length: Max. 1,000 m shielded, 600 m unshielded.

Dimensions / weight: 40 x 125 x 120 mm; approx. 200 g.

Compatibility & Applications

Fully compatible with Siemens SIMATIC S7-300 systems, this module is used for connecting sensors, switches, and other 24V DC field devices to the S7-300 PLC. It's well suited to industrial automation systems, process control applications, and any setup requiring reliable, electrically isolated digital signal acquisition from the field.

A1Customer — Industrial Automation Equipment | Tampere, Finland
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