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Siemens 6ES7321-1BH02-0AA0 — Digital Input Modules

Siemens 6ES7321-1BH02-0AA0 SM 321 16 DI, 24 V DC

MPN6ES7321-1BH02-0AA0

End of Life

Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1BH02-0AA0, 16 isolated inputs, 24 V DC, 1x 20-pole front connector.

$38.10Ref. price · indicative, final on quote

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Siemens 6ES7321-1BH02-0AA0 datasheet (PDF)

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7321-1BH02-0AA0 — Inputs
Parameter	Value
Number of digital inputs	16
Max. inputs, up to 40 °C	16
Max. inputs, up to 60 °C	16
2-wire sensor support	Yes

6ES7321-1BH02-0AA0 — Electrical
Parameter	Value
Rated value (DC)	24 V
Input voltage at signal "1"	13 to 30V
Input voltage type (AC/DC)	DC
Input voltage at signal "0"	-30 to +5 V
Permissible range, lower limit (DC)	20.4 V
Permissible range, upper limit (DC)	28.8 V
Input current at signal "1" (typ.)	7 mA
Power loss (typ.)	3.5 W
Current consumption from backplane bus (5 V DC), max.	10 mA
Permissible quiescent current, 2-wire sensor, max.	1.5 mA
Cable length, unshielded, max.	600 m
Cable length, shielded, max.	1 000 m

6ES7321-1BH02-0AA0 — Timing
Parameter	Value
Input delay 0 to 1, min.	1.2 ms
Input delay 1 to 0, min.	1.2 ms
Input delay 0 to 1, max.	4.8 ms
Input delay 1 to 0, max.	4.8 ms
Input delay, parameterizable values	No

6ES7321-1BH02-0AA0 — Diagnostics & Isolation
Parameter	Value
Diagnostics function	No
Diagnostic alarm	No
Hardware interrupt support	No
Isolation between channels	No
Isolation between channels and backplane bus	Yes; Optocoupler
Isolation test voltage	500 V DC
Channels per isolated group	16
Status indicator per channel (green)	Yes

6ES7321-1BH02-0AA0 — Mechanical
Parameter	Value
Depth	120 mm
Height	125 mm
Width	40 mm

Product details

Integration Notes

The 6ES7321-1BH02-0AA0: Mounts in a standard S7-300 rack; the 40 mm width occupies one slot position. The 20-pin front connector is required and sold separately. No parameterization, diagnostic alarms, or hardware interrupts are supported — this is a basic input module. The 16 inputs are grouped in one isolated group; no channel-to-channel isolation is provided. Unshielded cable runs up to 600 m, shielded up to 1,000 m. The permissible supply voltage range is 20.4 to 28.8 V DC.