Siemens 6ES7321-1FF01-0AA0

SM 321 digital input, 8 DI, 120/230 V AC

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Siemens SIMATIC S7-300 SM 321 digital input module: 8 isolated inputs for 120/230 V AC, in groups of 2, one 20-pole front connector.

Manufacturer: Siemens
Manufacturer part no.: 6ES7321-1FF01-0AA0
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.: 6ES7321-1FF01-0AA0
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 L1 / Rated value (AC): 230 V; 120/230 V AC
Input current / from backplane bus 5 V DC, max.: 29 mA
Power loss, typ.: 4.9 W
Number of digital inputs: 8
Digital inputs / Input characteristic curve in accordance with IEC 61131, type 1: Yes
Number of simultaneously controllable inputs / horizontal installation / up to 60 °C, max.: 8
Number of simultaneously controllable inputs / vertical installation / up to 40 °C, max.: 8
Input voltage / Type of input voltage: AC
Input voltage / Rated value (AC): 230 V; 120/230 V AC (47 ... 63 Hz)
Input voltage / for signal "0": 0 to 40V
Input voltage / for signal "1": 79 to 264V
Input current / for signal "1", typ.: 6.5 mA; (120 V); 11 mA (230 V)
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", max.: 25 ms
Input delay (for rated value of input voltage) / for standard inputs / at "1" to "0", max.: 25 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.: 2 mA
Interrupts/diagnostics/status information / Alarms: No
Interrupts/diagnostics/status information / Diagnostics function: No
Alarms / Diagnostic alarm: No
Alarms / Hardware interrupt: No
Diagnostics indication LED / Group error SF (red): No

Show all 40 specifications

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: 2
Potential separation digital inputs / between the channels and backplane bus: Yes; Optocoupler
Isolation tested with: 4 000 V DC
required front connector: 20-pin
Width: 40 mm
Height: 125 mm
Depth: 120 mm
Weight, approx.: 240 g

Technical documents (1)

Siemens data sheet 6ES7321-1FF01-0AA0

Key features

8 digital inputs, 120/230 V AC (47 to 63 Hz)
Signal "1" at 79 to 264 V
Isolated in groups of 2
Input delay up to 25 ms
Discontinued by Siemens on 1 October 2024; spare part only

About the Siemens 6ES7321-1FF01-0AA0

The Siemens 6ES7321-1FF01-0AA0 is an AC-voltage SM 321: it reads 8 inputs at 120 or 230 V AC (47 to 63 Hz) rather than 24 V DC, isolated in groups of 2; the 16-input version is the 6ES7321-1FH00-0AA0. Siemens's data sheet gives signal "1" at 79 to 264 V, 6.5 mA at 120 V and 11 mA at 230 V, and an input delay of up to 25 ms. SiePortal shows its product cancellation on 1 October 2024, a year before most of the S7-300 range, and siemens's data sheet marks it as a spare part.

What is the 6ES7321-1FF01-0AA0 used for?

It reads 120 or 230 V AC signals from switches and contacts straight into an S7-300 CPU.

Lifecycle and successor

Discontinued.

Before you order

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

Check the order number and the input voltage on the module: this one is for 120/230 V AC, not 24 V DC.

Other parts in the Siemens SIMATIC S7-300 family

Listed for reference. They differ from the 6ES7321-1FF01-0AA0 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 6ES7321-1BH50-0AA0SM 321 digital input, 16 DI, 24 V DC, sourcing input	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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