6ES7321-1BH02-0AA0 Siemens SIMATIC S7-300 Datasheet & Technical Manual

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Siemens 6ES7321-1BH02-0AA0 SIMATIC S7-300 Digital Input Module The Siemens 6ES7321-1BH02-0AA0, also cataloged as the Siemens 6ES7321-1BH02-0AA0 Digital Input Module, operates...

SKU: 6ES7321-1BH02-0AA0

Manufacturer: Siemens
Product No.: 6ES7321-1BH02-0AA0
Product Type: Digital I/O Cards
Product Origin: Germany
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Siemens 6ES7321-1BH02-0AA0 SIMATIC S7-300 Digital Input Module

The Siemens 6ES7321-1BH02-0AA0, also cataloged as the Siemens 6ES7321-1BH02-0AA0 Digital Input Module, operates as a dedicated hardware component for processing discrete 24 VDC sensor signals within SIMATIC S7-300 automation networks.

Hardware Specifications

Parameter	Specification
Model	6ES7321-1BH02-0AA0
Brand	Siemens
Origin	Germany
Weight	0.20 kg
Dimensions	40 mm x 125 mm x 120 mm (Packaging: 12 cm x 4 cm x 12.5 cm)
Operating Temp	0 to 60 deg C
Power Consumption	Max 10 mA from 5 VDC backplane bus
Number of Inputs	16
Input Voltage Type	24 V DC
Input Current	7 mA per channel
Input Delay	0.2 ms to 1.2 ms
Isolation	Optocoupler isolation; tested at 500 V DC
Required Front Connector	20-pin

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The 6ES7321-1BH02-0AA0 interfaces directly with the central processing unit or remote interface modules via the passive backplane bus assembly. This allows rapid data scanning synchronized across high-speed Profinet or PROFIBUS DP deterministic networks. It features a dense 16-channel layout that allows high-density I/O scaling within a single 40 mm wide slot housing, optimizing enclosure real estate. To maintain execution consistency across modular racks, all internal logic gates adhere to strict firmware flash compatibility parameters governed by the parent processing unit.

Frequently Asked Questions

Q: Does the 6ES7321-1BH02-0AA0 module require a 20-pin or a 40-pin front connector plug?

A: This specific 16-channel digital input module requires a standard 20-pin front connector for field wiring terminations.

Q: Is hot-swapping supported for this module during active PLC RUN operation?

A: Hot-swapping (removal and insertion under voltage) is only supported if the 6ES7321-1BH02-0AA0 is seated on an active backplane bus module frame; standard DIN rail configurations require a full system power shutdown before replacement.

Q: What is the isolation threshold between the field-side input channels and the internal backplane logic?

A: The module relies on optocoupler circuits to establish complete galvanic isolation between the 24 VDC field signals and the 5 VDC backplane components, verified up to a test voltage of 500 V DC.

Field Installation Guidelines

Front Connector Installation: Wire the field switches to the 20-pin front connector before snapping the assembly onto the module housing. Fasten the retention bolt securely to prevent micro-disconnections.
Cable Shielding and Routing: Route all 24 VDC signal lines apart from high-voltage AC power lines within the wire ducts to eliminate electromagnetic interference. Shielded cables up to 200 m must be terminated at the earthing bar.
DIN Rail Bonding: Ensure the S7-300 aluminum mounting rail is properly bonded to the cabinet functional earth (FE) plane using a low-impedance grounding cable to maintain effective noise suppression.

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