Siemens 6ES7321-1BH50-0AA0
SM 321 digital input, 16 DI, 24 V DC, sourcing input
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Siemens SIMATIC S7-300 SM 321 digital input module: 16 isolated sourcing inputs, 24 V DC, one 20-pole front connector.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7321-1BH50-0AA0
- Product family
- SIMATIC S7-300 PLC Modules
- Type
- Digital input module
- Category
- PLCs and I/O › Digital I/O modules
- Lifecycle
- Discontinued
- OEM successor
- Not stated
- Technical datasheet
- Data sheet
Technical specifications
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7321-1BH50-0AA0
- 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"
- -5 to +30V
- 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 / 2-wire sensor / 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, sourcing
- Signal "1" at -13 to -30 V, signal "0" at -5 to +30 V
- Input delay 1.2 to 4.8 ms
- No diagnostics or interrupts
- Discontinued by Siemens on 1 October 2025; spare part only
About the Siemens 6ES7321-1BH50-0AA0
The Siemens 6ES7321-1BH50-0AA0 is the sourcing-input version of the 16-channel SM 321; the standard module is the 6ES7321-1BH02-0AA0. Siemens's data sheet gives signal "1" at -13 to -30 V and signal "0" at -5 to +30 V. Otherwise it is a basic SM 321: 16 inputs at 24 V DC, an input delay of 1.2 to 4.8 ms, no diagnostics or interrupts, and a 20-pin front connector. Siemens's data sheet marks it as a spare part.
What is the 6ES7321-1BH50-0AA0 used for?
It reads switches and sensors into an S7-300 CPU in installations wired for sourcing inputs.
Lifecycle and successor
Discontinued.
Before you order
What to photograph or confirm so the right unit is quoted.
Check the order number on the module: 1BH50 is the sourcing version, 1BH02 the standard one. Replace like with like.
Other parts in the Siemens SIMATIC S7-300 family
Listed for reference. They differ from the 6ES7321-1BH50-0AA0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.
| Product | Type | Lifecycle | Qty Available | Price | Action |
|---|---|---|---|---|---|
| Siemens 6ES7321-1BL00-0AA0SM 321 digital input, 32 DI, 24 V DC | Digital input module | Discontinued | On Request | On request | View |
| Siemens 6ES7321-1BH02-0AA0SM 321 digital input, 16 DI, 24 V DC | Digital input module | Discontinued | On Request | On request | View |
| Siemens 6ES7321-1FH00-0AA0SM 321 digital input, 16 DI, 120/230 V AC | Digital input module | Discontinued | On Request | On request | View |
| Siemens 6ES7322-1FH00-0AA0SM 322 digital output, 16 DO, 120/230 V AC, 1 A | Digital output module | Discontinued | On Request | On request | View |
| Siemens 6ES7322-1HF01-0AA0SM 322 relay output, 8 DO, relay contacts | Digital output module | Discontinued | On Request | On request | View |
| Siemens 6ES7321-7BH01-0AB0SM 321 digital input, 16 DI, 24 V DC, diagnostics and hardware interrupt | Digital input module | Discontinued | On Request | On request | View |
| Siemens 6ES7321-1FF01-0AA0SM 321 digital input, 8 DI, 120/230 V AC | Digital input module | Discontinued | On Request | On request | View |
| Siemens 6ES7322-1BF01-0AA0SM 322 digital output, 8 DO, 24 V DC, 2 A | Digital output module | Discontinued | On Request | On request | View |
| Siemens 6ES7322-8BF00-0AB0SM 322 digital output, 8 DO, 24 V DC, 0.5 A, diagnostics | Digital output module | Discontinued | On Request | On request | View |
| Siemens 6ES7322-1HF10-0AA0SM 322 relay output, 8 DO, 5 A, isolated per channel | Digital output module | Discontinued | On Request | On request | View |
| Siemens 6ES7323-1BH01-0AA0SM 323 digital I/O, 8 DI and 8 DO, 24 V DC, 0.5 A | Digital I/O module | Discontinued | On Request | On request | View |
| Siemens 6AG1321-1BL00-2AA0SIPLUS SM 321 digital input, 32 DI, 24 V DC, conformal coating | Digital input module | Discontinued | On Request | On request | View |
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