BOM / RFQ

Siemens 6ES7321-1BH10-0AA0 — Digital Input Modules

Siemens 6ES7321-1BH10-0AA0 SM 321, 16 DI, 24 V DC, obsolete

MPN6ES7321-1BH10-0AA0

End of Life

Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1BH10-0AA0, 16 isolated inputs, 24 V DC, 20-pin front connector, depth 120 mm, width 40 mm.

$77.77 – $226.00Ref. price · indicative, final on quote

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Siemens 6ES7321-1BH10-0AA0 datasheet (PDF)

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

Specifications

6ES7321-1BH10-0AA0 — 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

6ES7321-1BH10-0AA0 — 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.)	3.8 W
Current consumption from backplane bus (5 V DC), max.	110 mA
Permissible quiescent current, 2-wire sensor, max.	1.5 mA
Cable length, unshielded, max.	600 m
Cable length, shielded, max.	1 000 m

6ES7321-1BH10-0AA0 — Timing
Parameter	Value
Input delay 0 to 1, min.	25 µs
Input delay 1 to 0, min.	25 µs
Input delay 0 to 1, max.	75 µs
Input delay 1 to 0, max.	75 µs
Input delay, parameterizable values	No

6ES7321-1BH10-0AA0 — 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

6ES7321-1BH10-0AA0 — Mechanical
Parameter	Value
Depth	120 mm
Height	125 mm
Width	40 mm

Product details

16-channel DC input module for S7-300

The 6ES7321-1BH10-0AA0: This SM 321 module provides 16 digital inputs, each accepting 24 V DC nominal (permissible range 20.4 V to 28.8 V). The typical input current at signal "1" is 7 mA, with a quiescent current limit of 1.5 mA for 2-wire sensors. Input delay is fixed at 25 µs min to 75 µs max for both 0→1 and 1→0 transitions — not parameterizable. The module does not support diagnostic alarms, hardware interrupts, or channel-to-channel isolation; all 16 inputs share a common group isolated from the backplane bus via optocoupler.

Unshielded cable runs up to 600 m are permitted; shielded runs up to 1 000 m. Power dissipation is 3.8 W typical, and the module draws 110 mA max from the 5 V DC backplane bus.

Frequently asked questions

How can I order 6ES7321-1BH10-0AA0 or check stock?

This module is sourced to order against an RFQ. Submit a request for current pricing and availability; the quote will confirm lead time and stock position at the time of inquiry.