SIEMENS S7-300 SM 321 digital input modules

SM 321 digital input modules

Overview

  • Digital inputs
  • For connecting standard switches and two-wire proximity switches (BEROs)

Digital input modules can be used to connect the PLC to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches (BERO).

Design

Digital input modules feature the following mechanical characteristics:

  • Compact design:
    The rugged plastic housing contains:

    • Green LEDs for indicating the signal status at the inputs.
    • Socket for the front connector, protected, behind the front door.
    • Labeling field on the front door.
    • Connector pin assignment for the wiring on the inside of the front door.
  • Easy installation:
    There are no slot rules, the addresses of the inputs are determined by the slot.
    When used in ET 200M in combination with active bus modules, hot swapping is possible without any reaction.
  • User-friendly wiring.

The modules are available with 8, 16, 32, or 64 channels.


Function

Digital input modules convert the level of the external digital signals from the process to the internal signal level (logical “0” or “1”) of the controller.

Various input voltages support the connection of different process signals:

  • 24 V DC
  • 48 to 125 V DC
  • 120/230 V AC

Apart from cost-effective, easy-to-handle modules, modules with special functions are also available:

  • For use in isochronous mode
  • Process and diagnostic alarms
  • Use for current sourcing or current sinking

Special modules are also available for process engineering which, for example, support the NAMUR standard.

Ordering data
Product No. / Product Description

SM 321 digital input modules Ordering data

6ES7321-1BH02-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16DI, 24 V DC, 1 X 20 PIN
6ES7321-1BH10-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, GALVANICALLY ISOLATED, 16DI, 24 V DC, 1 X 20 PIN, 0.05 MS INPUT DELAY
6ES7321-1BH50-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 16DI, 24 V DC, SOURCE INPUT, 1 X 20 PIN
6ES7321-1BL00-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 32DI, 24 V DC, 1 X 40 PIN
6ES7321-1BP00-0AA0
SIMATIC S7-300 DIGITAL INPUT SM321, OPTICALLY ISOLATED IN GROUPS OF 16, 64 DI,DC 24V, 3MS, SINKING/SOURCING TERMINAL BLOCKS 6ES7392-1.N00-0AA0 AND CABLES 6ES7392-4…0-0AA0 NECESSARY
6ES7321-1CH00-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, AC/DC 24 – 48V WITH ONE CHANNEL PER COMMON, 1 X 40 PIN
6ES7321-1CH20-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, DC 48-125V, 1 X 20 PIN
6ES7321-1EL00-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 32 DI, 120V AC, 1 X 40 PIN
6ES7321-1FF01-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 8 DI, 120V/230V AC, 1 X 20 PIN
6ES7321-1FF10-0AA0
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 8 DI, 120V/230V AC, 1 X 40 PIN, WITH 1 POINT PER COMMON
Technical specifications

Article number

6ES7321-1BH02-0AA0

6ES7321-1BH50-0AA0

6ES7321-1BL00-0AA0

6ES7321-1BP00-0AA0

6ES7321-1BH10-0AA0

SM321, 16DI, DC24V

SM321, 16DI, DC24V, SOURCE INPUT

SM321, 32DI, DC24V

SM321, 64 DI, DC 24V, 3MS, SINK/SOURE

SM321,16DI,DC24V, 0.05MS INPUT DELAY.

Supply voltage

Load voltage L+

  • ● Rated value (DC)

24 V

24 V

24 V

24 V

24 V

  • ● permissible range, lower limit (DC)

20.4 V

20.4 V

20.4 V

20.4 V

  • ● permissible range, upper limit (DC)

28.8 V

28.8 V

28.8 V

28.8 V

Input current

from backplane bus 5 V DC, max.

10 mA

10 mA

15 mA

100 mA

110 mA

Power loss

Power loss, typ.

3.5 W

3.5 W

6.5 W

7 W

3.8 W

Digital inputs

Number of digital inputs

16

16

32

64

16

Input characteristic curve in accordance with IEC 61131, type 1

Yes

Yes

Yes

Yes

Yes

Number of simultaneously controllable inputs

all mounting positions

  • — up to 40 °C, max.

64

  • — up to 60 °C, max.

32

horizontal installation

  • — up to 40 °C, max.

16

16

32

64

16

  • — up to 60 °C, max.

16

16

16

32

16

vertical installation

  • — up to 40 °C, max.

16

16

32

32

16

Input voltage

  • ● Type of input voltage

DC

DC

DC

DC

DC

  • ● Rated value (DC)

24 V

24 V

24 V

24 V

24 V

  • ● for signal “0”

-30 to +5V

-5 to +30V

-30 to +5V

-30 to +5V

-30 to +5V

  • ● for signal “1”

13 to 30V

-13 to -30V

13 to 30V

13 to 30V

13 to 30V

Input current

  • ● for signal “1”, typ.

7 mA

7 mA

7 mA

4.2 mA

7 mA

Input delay (for rated value of input voltage)

for standard inputs

  • — parameterizable

No

No

No

No

No

  • — at “0” to “1”, min.

1.2 ms

1.2 ms

1.2 ms

1.2 ms

25 µs

  • — at “0” to “1”, max.

4.8 ms

4.8 ms

4.8 ms

4.8 ms

75 µs

  • — at “1” to “0”, min.

1.2 ms

1.2 ms

1.2 ms

1.2 ms

25 µs

  • — at “1” to “0”, max.

4.8 ms

4.8 ms

4.8 ms

4.8 ms

75 µs

Cable length

  • ● shielded, max.

1 000 m

1 000 m

1 000 m

1 000 m

1 000 m

  • ● unshielded, max.

600 m

600 m

600 m

600 m

600 m

Encoder

Connectable encoders

  • ● 2-wire sensor

Yes

Yes

Yes

No

Yes

  • — permissible quiescent current (2-wire sensor), max.

1.5 mA

1.5 mA

1.5 mA

1.5 mA

Isochronous mode

Isochronous operation (application synchronized up to terminal)

No

No

No

No

Yes

Interrupts/diagnostics/status information

Diagnostic functions

No

No

No

No

No

Alarms

  • ● Diagnostic alarm

No

No

No

No

No

  • ● Hardware interrupt

No

No

No

No

No

Diagnostic messages

  • ● Wire-break

No

Diagnostics indication LED

  • ● Group error SF (red)

No

  • ● Status indicator digital input (green)

Yes

Yes

Yes

Yes

Yes

Potential separation

Potential separation digital inputs

  • ● between the channels

No

No

No

No

No

  • ● between the channels, in groups of

16

16

16

16

16

  • ● between the channels and backplane bus

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Isolation

Isolation tested with

500 V DC

500 V DC

500 V DC

500 V DC

500 V DC

Connection method

required front connector

20-pin

20-pin

40-pin

Cable: 6ES7392-4Bxx0-0AA0 terminal blocks: 6ES7392-1xN00-0AA0

20-pin

Dimensions

Width

40 mm

40 mm

40 mm

40 mm

40 mm

Height

125 mm

125 mm

125 mm

125 mm

125 mm

Depth

120 mm

120 mm

120 mm

112 mm

120 mm

Weights

Weight, approx.

200 g

200 g

260 g

230 g

200 g

Article number

6ES7321-7BH01-0AB0

6ES7321-1CH00-0AA0

6ES7321-1CH20-0AA0

6ES7321-1FH00-0AA0

SM321, 16DI, 24V DC

SM321, 16 DI, AC/DC 24-48V, 1CH/COMMON

SM321, 16DI, DC48-125V

SM321, 16 DI, 120/230V AC

Supply voltage

Load voltage L+

  • ● Rated value (DC)

24 V

24 V

48 V

  • ● permissible range, lower limit (DC)

20.4 V

24 V

48 V

  • ● permissible range, upper limit (DC)

28.8 V

48 V

125 V

Load voltage L1

  • ● Rated value (AC)

24 V

230 V; 120/230 V AC; all load voltages must have the same phase.

  • ● permissible range, lower limit (AC)

24 V

  • ● permissible range, upper limit (AC)

48 V

Input current

from load voltage L+ (without load), max.

90 mA

from backplane bus 5 V DC, max.

130 mA

100 mA

40 mA

29 mA

Power loss

Power loss, typ.

4 W

1.5 W; at 24 V; 2,8 W at 48 V

4.3 W

4.9 W

Digital inputs

Number of digital inputs

16

16

16

16

Input characteristic curve in accordance with IEC 61131, type 1

Yes

Yes

Yes

Input characteristic curve in accordance with IEC 61131, type 2

Yes

horizontal installation

  • — up to 40 °C, max.

16

16

8

16

  • — up to 60 °C, max.

16

16

8; 6 to Ue 146 V

16

vertical installation

  • — up to 40 °C, max.

16

16

8

16

Input voltage

  • ● Type of input voltage

DC

AC/DC

DC

AC

  • ● Rated value (DC)

24 V

24 V; DC 24 or 48 V

48 V; 48 V DC to 125 V DC

  • ● Rated value (AC)

24 V; 24 V AC or 48 V AC (0 … 63 Hz)

230 V; 120/230 V AC (47 … 63 Hz)

  • ● for signal “0”

-30 to +5V

-5V AC to +5V AC

-146 V DC to +15 V DC

0 to 40V

  • ● for signal “1”

13 to 30V

14V AC to 60V AC

30 V DC to 146 V DC

79 to 264V

Input current

  • ● for signal “1”, typ.

7 mA

2.7 mA

3.5 mA

6.5 mA; (120V, 60Hz), 16mA (230V, 50Hz)

Input delay (for rated value of input voltage)

for standard inputs

  • — parameterizable

Yes; 0.1 / 0.5 / 3 / 15 / 20 ms

No

No

No

  • — at “0” to “1”, min.

16 ms

0.1 ms

25 ms

  • — at “0” to “1”, max.

16 ms

3.5 ms

25 ms

  • — at “1” to “0”, min.

0.7 ms

  • — at “1” to “0”, max.

16 ms

3 ms

25 ms

Cable length

  • ● shielded, max.

1 000 m

1 000 m

1 000 m

1 000 m

  • ● unshielded, max.

600 m

600 m

600 m

600 m

Encoder

Connectable encoders

  • ● 2-wire sensor

Yes

Yes

Yes

Yes

  • — permissible quiescent current (2-wire sensor), max.

2 mA

1 mA

1 mA

2 mA

Isochronous mode

Isochronous operation (application synchronized up to terminal)

Yes

No

No

No

Interrupts/diagnostics/status information

Diagnostic functions

Yes; Parameterizable

No

No

No

Alarms

  • ● Diagnostic alarm

Yes; Parameterizable

No

No

No

  • ● Hardware interrupt

Yes; Parameterizable

No

No

No

Diagnostic messages

  • ● Wire-break

Yes; to I< 1 mA

Diagnostics indication LED

  • ● Group error SF (red)

Yes

No

No

No

  • ● Status indicator digital input (green)

Yes

Yes

Yes

Yes

Potential separation

Potential separation digital inputs

  • ● between the channels

No

Yes

No

No

  • ● between the channels, in groups of

16

1

8

4

  • ● between the channels and backplane bus

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Permissible potential difference

between different circuits

170 V DC/120 V AC

146 V DC/132 V AC

Isolation

Isolation tested with

500 V DC

1500 V AC

1500 V DC

4 000 V DC

Connection method

required front connector

20-pin

40-pin

20-pin

20-pin

Dimensions

Width

40 mm

40 mm

40 mm

40 mm

Height

125 mm

125 mm

125 mm

125 mm

Depth

120 mm

120 mm

120 mm

120 mm

Weights

Weight, approx.

200 g

260 g

200 g

240 g

Article number

6ES7321-1EL00-0AA0

6ES7321-1FF01-0AA0

6ES7321-1FF10-0AA0

SM321, 32DI, AC120V

SM321, 8DI, AC120/230V

SM321, 8 DI, AC/DC 120/230V, 1CH/COMMON

Load voltage L1

  • ● Rated value (AC)

120 V

230 V; 120/230V AC

230 V; 120/230 V AC; all load voltages must have the same phase.

Input current

from backplane bus 5 V DC, max.

16 mA

29 mA

100 mA

Power loss

Power loss, typ.

4 W

4.9 W

4.9 W

Digital inputs

Number of digital inputs

32

8

8

Input characteristic curve in accordance with IEC 61131, type 1

Yes

Yes

Input characteristic curve in accordance with IEC 61131, type 2

Yes

horizontal installation

  • — up to 40 °C, max.

32

  • — up to 60 °C, max.

24

8

8

vertical installation

  • — up to 40 °C, max.

32

8

8

Input voltage

  • ● Type of input voltage

AC

AC

AC

  • ● Rated value (AC)

120 V; 47 … 63 Hz

230 V; 120/230 V AC (47 … 63 Hz)

120 V; 120/230 V AC (47 … 63 Hz)

  • ● for signal “0”

0 to 20V

0 to 40V

0 to 40V

  • ● for signal “1”

74 to 132V

79 to 264V

79 to 264V

Input current

  • ● for signal “1”, typ.

21 mA

6.5 mA; (120 V); 11 mA (230 V)

7.5 mA; (120 V); 17.3 mA (230 V)

Input delay (for rated value of input voltage)

for standard inputs

  • — parameterizable

No

No

No

  • — at “0” to “1”, max.

15 ms

25 ms

25 ms

  • — at “1” to “0”, max.

25 ms

25 ms

25 ms

Cable length

  • ● shielded, max.

1 000 m

1 000 m

1 000 m

  • ● unshielded, max.

600 m

600 m

600 m

Encoder

Connectable encoders

  • ● 2-wire sensor

Yes

Yes

Yes

  • — permissible quiescent current (2-wire sensor), max.

4 mA

2 mA

2 mA

Isochronous mode

Isochronous operation (application synchronized up to terminal)

No

No

No

Interrupts/diagnostics/status information

Diagnostic functions

No

No

No

Alarms

  • ● Diagnostic alarm

No

No

No

  • ● Hardware interrupt

No

No

No

Diagnostics indication LED

  • ● Group error SF (red)

No

No

No

  • ● Status indicator digital input (green)

Yes; per channel

Yes

Yes

Potential separation

Potential separation digital inputs

  • ● between the channels

No

No

Yes

  • ● between the channels, in groups of

8

2

1

  • ● between the channels and backplane bus

Yes; Optocoupler

Yes; Optocoupler

Yes; Optocoupler

Isolation

Isolation tested with

2500 V DC

4 000 V DC

1500 V AC

Connection method

required front connector

40-pin

20-pin

40-pin

Dimensions

Width

40 mm

40 mm

40 mm

Height

125 mm

125 mm

125 mm

Depth

120 mm

120 mm

120 mm

Weights

Weight, approx.

300 g

240 g

240 g