Siemens 6AG1321-1BL00-2AA0

SIPLUS SM 321 digital input, 32 DI, 24 V DC, conformal coating

Read from the product label

Maker: Siemens
Part no.: 6AG1321-1BL00-2AA0
Serial / rev.: as printed on your unit

Image is for illustrative purposes only. Please refer to product description.

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Siemens SIPLUS S7-300 SM 321 digital input module, based on the 6ES7321-1BL00-0AA0 with conformal coating for -40 to +70 °C: 32 isolated inputs, 24 V DC, 40-pole front connector.

Manufacturer: Siemens
Manufacturer part no.: 6AG1321-1BL00-2AA0
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.: 6AG1321-1BL00-2AA0
Type: Digital input module
Application: Digital input module (SIPLUS)
Used with: SIMATIC S7-300 rack (S7-300 backplane bus)
based on: 6ES7321-1BL00-0AA0
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.: 15 mA
Power loss, typ.: 6.5 W
Number of digital inputs: 32
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.: 32
Number of simultaneously controllable inputs / horizontal installation / up to 60 °C, max.: 16; 12 @ > 60 °C
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 / 2-wire sensor / permissible quiescent current (2-wire sensor), max.: 1.5 mA

Show all 75 specifications

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
Standards, approvals, certificates / CE mark: Yes
Standards, approvals, certificates / UL approval: Yes; File E239877
Standards, approvals, certificates / RCM (formerly C-TICK): Yes
Standards, approvals, certificates / KC approval: Yes
Standards, approvals, certificates / EAC (formerly Gost-R): Yes
Railway application / EN 50155: Yes; Sections 4, 5 and 12; no further agreements apply; T1, Category 1, Class A/B, EN 50155:2007 (see SIOS entry 109755985)
Ambient temperature during operation / min.: -40 °C; = Tmin
Ambient temperature during operation / max.: 70 °C; = Tmax; for use on railway vehicles according to EN50155, the rated temperature range -25 ... +55 °C (T1) or 60 °C @ UL/ULhaz/ATEX/FM use applies
Ambient temperature during storage/transportation / min.: -40 °C
Ambient temperature during storage/transportation / max.: 70 °C
Altitude during operation relating to sea level / Installation altitude above sea level, max.: 5 000 m
Altitude during operation relating to sea level / Ambient air temperature-barometric pressure-altitude: Tmin ... Tmax at 1 140 hPa ... 795 hPa (-1 000 m ... +2 000 m) // Tmin ... (Tmax - 10 K) at 795 hPa ... 658 hPa (+2 000 m ... +3 500 m) // Tmin ... (Tmax -20 K) at 658 hPa ... 540 hPa (+3 500 m ... +5 000 m)
Relative humidity / With condensation, tested in accordance with IEC 60068-: 100 %; RH incl. condensation/frost (no commissioning under condensation
Relative humidity / 2-38, max.: conditions)
Resistance / Use in stationary industrial systems / to biologically active substances according to EN: Yes; Class 3B2 mold, fungus and dry rot spores (with the exception of fauna);
Ambient conditions / Resistance / Use in stationary industrial systems / 60721-3-3: Class 3B3 on request; degree 3); *
Resistance / Use in stationary industrial systems / to chemically active substances according to EN: Yes; Class 3C4 (RH < 75 %) incl. salt spray acc. to EN 60068-2-52 (severity
Resistance / Use in stationary industrial systems / to mechanically active substances according to EN 60721-3-3: Yes; Class 3S4 incl. sand, dust, *
Resistance / Use on land craft, rail vehicles and special-purpose vehicles / to biologically active substances according to EN: Yes; Class 5B2 mold, fungus and dry rot spores (with the exception of fauna);
Resistance / Use on land craft, rail vehicles and special-purpose vehicles / 60721-3-5: Class 5B3 on request
Resistance / Use on land craft, rail vehicles and special-purpose vehicles / to chemically active substances according to EN 60721-3-5: Yes; Class 5C3 (RH < 75 %) incl. salt spray acc. to EN 50155 (ST2); *
Resistance / Use on land craft, rail vehicles and special-purpose vehicles / to mechanically active substances according to EN 60721-3-5: Yes; Class 5S3 incl. sand, dust; *
Resistance / Use on ships/at sea / to biologically active substances according to EN: Yes; Class 6B2 mold and fungal spores (excluding fauna); Class 6B3 on
Ambient conditions / Resistance / Use on ships/at sea / 60721-3-6: request; degree 3); *
Resistance / Use on ships/at sea / to chemically active substances according to EN: Yes; Class 6C3 (RH < 75 %) incl. salt spray acc. to EN 60068-2-52 (severity
Resistance / Use on ships/at sea / to mechanically active substances according to EN 60721-3-6: Yes; Class 6S3 incl. sand, dust; *
Resistance / Usage in industrial process technology / Against chemically active substances acc. to EN 60654-4: Yes; Class 3 (excluding trichlorethylene)
Resistance / Usage in industrial process technology / Environmental conditions for process, measuring: Yes; Level GX group A/B (excluding trichlorethylene; harmful gas
Resistance / Usage in industrial process technology / and control systems acc. to ANSI/ISA-71.04: concentrations up to the limits of EN 60721-3-3 class 3C4 permissible); level LC3 (salt spray) and level LB3 (oil)
Resistance / Remark / Note regarding classification of environmental: * The supplied plug covers must remain in place over the unused interfaces
Resistance / Remark / conditions acc. to EN 60721, EN 60654-4 and ANSI/ISA-71.04: during operation!
required front connector: 40-pin
Width: 40 mm
Height: 125 mm
Depth: 120 mm
Weight, approx.: 260 g

Technical documents (1)

Siemens data sheet 6AG1321-1BL00-2AA0

Key features

32 digital inputs, 24 V DC
Conformal coating; -40 to +70 °C (Siemens's description)
Based on the standard 6ES7321-1BL00-0AA0
Railway application to EN 50155 (see Siemens's data sheet)
Discontinued by Siemens on 1 October 2025; spare part only

About the Siemens 6AG1321-1BL00-2AA0

The Siemens 6AG1321-1BL00-2AA0 is the SIPLUS version of the 32-channel SM 321 (6ES7321-1BL00-0AA0): the same inputs, with conformal coating and a -40 to +70 °C range in Siemens's description. Siemens's data sheet gives 32 inputs at 24 V DC (IEC 61131 type 1), a 40-pin front connector and EN 50155 railway application. Siemens's data sheet marks it as a spare part.

What is the 6AG1321-1BL00-2AA0 used for?

It reads switches and sensors into an S7-300 CPU where temperatures or conditions are outside the standard module's rating.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check the order number: SIPLUS modules start 6AG1; the standard module is the 6ES7321-1BL00-0AA0. A standard module in a SIPLUS position does not have the coating.

Other parts in the Siemens SIMATIC S7-300 family

Listed for reference. They differ from the 6AG1321-1BL00-2AA0 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 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 6ES7321-1BH50-0AA0SM 321 digital input, 16 DI, 24 V DC, sourcing input	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 6ES7341-1AH02-0AE0CP 341 communications processor, RS 232C	Communications processor	Discontinued	On Request	On request	View
Siemens 6GK7343-2AH11-0XA0CP 343-2P AS-Interface master for S7-300 and ET 200M	Communications processor	Discontinued	On Request	On request	View
Siemens 6GK7343-1GX31-0XE0CP 343-1 Advanced communications processor, gigabit and PROFINET	Communications processor	Discontinued	On Request	On request	View
Siemens 6ES7351-1AH02-0AE0FM 351 positioning module for rapid/creep traverse drives	Positioning module	Discontinued	On Request	On request	View
Siemens 6ES7352-1AH02-0AE0FM 352 electronic cam controller, 13 cam tracks	Cam controller module	Discontinued	On Request	On request	View
Siemens 6ES7355-0VH10-0AE0FM 355 C controller module, 4 continuous control channels	Controller module	Discontinued	On Request	On request	View

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