6ES7321-1BH02-0AA0
Siemens SM 321 digital input, 16 DI, 24 V DC
Read from the product label
- Maker
- Siemens
- Part no.
- 6ES7321-1BH02-0AA0
- Serial / rev.
- as printed on your unit
Illustration of the unit type, not a photo of this part.
Delivery options
Siemens SIMATIC S7-300 SM 321 digital input module: 16 isolated inputs, 24 V DC, one 20-pole front connector.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7321-1BH02-0AA0
- Product family
- SIMATIC S7-300 PLC Modules
- Type
- Digital input module
- Lifecycle
- Discontinued: product cancellation (Siemens SiePortal), spare part only
- OEM successor
- Not stated
- Technical datasheet
- Data sheet
Technical specifications
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7321-1BH02-0AA0
- Type
- Digital input module
- Application
- Digital input module
- Used with
- SIMATIC S7-300 rack (S7-300 backplane bus)
- Product function / Isochronous mode
- No
- Load voltage L+ / Rated value (DC)
- 24 V
- Load voltage L+ / permissible range, lower limit (DC)
- 20.4 V
- Load voltage L+ / permissible range, upper limit (DC)
- 28.8 V
- Input current / from backplane bus 5 V DC, max.
- 10 mA
- Power loss, typ.
- 3.5 W
- Number of digital inputs
- 16
- Digital inputs / Input characteristic curve in accordance with IEC 61131, type 1
- Yes
- Number of simultaneously controllable inputs / horizontal installation / up to 40 °C, max.
- 16
- Number of simultaneously controllable inputs / horizontal installation / up to 60 °C, max.
- 16
- Number of simultaneously controllable inputs / vertical installation / up to 40 °C, max.
- 16
- Input voltage / Type of input voltage
- DC
- Input voltage / Rated value (DC)
- 24 V
- Input voltage / for signal "0"
- -30 to +5 V
- Input voltage / for signal "1"
- 13 to 30V
- Input current / for signal "1", typ.
- 7 mA
- Input delay (for rated value of input voltage) / for standard inputs / parameterizable
- No
- Input delay (for rated value of input voltage) / for standard inputs / at "0" to "1", min.
- 1.2 ms
- Input delay (for rated value of input voltage) / for standard inputs / at "0" to "1", max.
- 4.8 ms
- Input delay (for rated value of input voltage) / for standard inputs / at "1" to "0", min.
- 1.2 ms
- Input delay (for rated value of input voltage) / for standard inputs / at "1" to "0", max.
- 4.8 ms
- Cable length / shielded, max.
- 1 000 m
- Cable length / unshielded, max.
- 600 m
- Connectable encoders / 2-wire sensor
- Yes
- Connectable encoders / permissible quiescent current (2-wire sensor), max.
- 1.5 mA
Show all 44 specificationsShow fewer
- Interrupts/diagnostics/status information / Alarms
- No
- Interrupts/diagnostics/status information / Diagnostics function
- No
- Alarms / Diagnostic alarm
- No
- Alarms / Hardware interrupt
- No
- Diagnostics indication LED / Status indicator digital input (green)
- Yes
- Potential separation digital inputs / between the channels
- No
- Potential separation digital inputs / between the channels, in groups of
- 16
- Potential separation digital inputs / between the channels and backplane bus
- Yes; Optocoupler
- Isolation tested with
- 500 V DC
- required front connector
- 20-pin
- Width
- 40 mm
- Height
- 125 mm
- Depth
- 120 mm
- Weight, approx.
- 200 g
Technical documents (1)
Key features
- 16 digital inputs, 24 V DC
- Isolated from the backplane bus
- 20-pin front connector
- Discontinued by Siemens on 1 October 2025; spare part only
About the Siemens 6ES7321-1BH02-0AA0
The Siemens 6ES7321-1BH02-0AA0 is the 16-channel SM 321 digital input module, 24 V DC, isolated, with a 20-pin front connector. Siemens's data sheet marks it as a spare part. Siemens names no direct successor for the order number; its route forward is migration to the S7-1500 with ET 200MP.
What is the 6ES7321-1BH02-0AA0 used for?
It reads switches, sensors and contacts into an S7-300 CPU, in the CPU's rack or in an ET 200M remote station.
Lifecycle and successor
Discontinued: product cancellation (Siemens SiePortal), spare part only.
Before you order
What to photograph or confirm so the right unit is quoted.
Check the order number on the module. The front connector with the field wiring normally moves across to the replacement.
Alternatives for 6ES7321-1BH02-0AA0
The manufacturer’s named successor and other parts in the same family. None is a drop-in replacement without checking wiring, I/O and configuration for your installation.
| Product | Manufacturer | Type | Lifecycle | Relationship | Qty Available | Price | Action |
|---|---|---|---|---|---|---|---|
| Siemens 6ES7315-2AH14-0AB0CPU 315-2 DP, 256 KB, MPI and PROFIBUS DP | Siemens | PLC CPU | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7315-2EH14-0AB0CPU 315-2 PN/DP, 384 KB, MPI/DP and PROFINET | Siemens | PLC CPU | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7317-2EK14-0AB0CPU 317-2 PN/DP, 1 MB, MPI/DP and PROFINET | Siemens | PLC CPU | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7314-6EH04-0AB0CPU 314C-2 PN/DP compact CPU with integrated I/O | Siemens | PLC CPU | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7313-5BG04-0AB0CPU 313C compact CPU with integrated I/O, MPI | Siemens | PLC CPU | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7321-1BL00-0AA0SM 321 digital input, 32 DI, 24 V DC | Siemens | Digital input module | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7322-1BL00-0AA0SM 322 digital output, 32 DO, 24 V DC, 0.5 A | Siemens | Digital output module | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7331-7KF02-0AB0SM 331 analog input, 8 AI, U/I/thermocouple/resistance | Siemens | Analog input module | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7332-5HF00-0AB0SM 332 analog output, 8 AO, voltage/current | Siemens | Analog output module | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6ES7307-1EA01-0AA0PS307 power supply, 120/230 V AC in, 24 V DC 5 A out | Siemens | Power supply | Phase-out announced (Siemens SiePortal) | Same family | On Request | On request | View › |
| Siemens 6GK7343-1CX10-0XE0CP 343-1 Lean communications processor, Industrial Ethernet | Siemens | Communications processor | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
| Siemens 6GK7343-1EX30-0XE0CP 343-1 communications processor, Industrial Ethernet, PROFINET IO controller | Siemens | Communications processor | Discontinued: product cancellation (Siemens SiePortal), spare part only | Same family | On Request | On request | View › |
You may also be interested in
Siemens
Siemens 6ES7972-0BA12-0XA0
View ›Siemens
Siemens 6ES7972-0BB12-0XA0
View ›Siemens
Siemens 6ES7972-0BA42-0XA0
View ›Siemens
Siemens 6ES7972-0BB42-0XA0
View ›Siemens
Siemens 6ES7972-0BA52-0XA0
View ›Siemens
Siemens 6ES7972-0BB52-0XA0
View ›Siemens
Siemens 6ES7972-0BA61-0XA0
View ›Siemens
Siemens 6ES7972-0BA70-0XA0
View ›Siemens
Siemens 6GK1500-0FC10
View ›Siemens
Siemens 6GK1901-1BB10-2AA0
View ›Siemens
Siemens 6GK1901-1BB11-2AA0
View ›Siemens
Siemens 6XV1830-0EH10
View ›
TIMC is an independent distributor. Manufacturer names and logos are the property of their respective owners and identify products we source; they do not imply manufacturer authorisation or affiliation.