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Siemens PLCs SIMATIC S7 digital input SM 321 Module 6ES7321-7RD00-0AB0

Siemens PLCs SIMATIC S7 digital input SM 321 Module 6ES7321-7RD00-0AB0

Series#: Siemens PLC

Product Details

Siemens PLCs SIMATIC S7 digital input SM 321 Module 6ES7321-7RD00-0AB0
Siemens PLC Controller Module LOGO Series
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Specification

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Article number	6ES7321-7RD00-0AB0
	SM321, 4DI, DC24V, HAZARDOUS AREAS
Supply voltage
Load voltage L+
● Rated value (DC)	24 V
● Reverse polarity protection	Yes
Input current
from load voltage L+ (without load), max.	50 mA
from backplane bus 5 V DC, max.	80 mA
Encoder supply
Type of output voltage	via the inputs
Power loss
Power loss, typ.	1.1 W
Digital inputs
Number of digital inputs	4
Number of NAMUR inputs	4
Input voltage
● Type of input voltage	DC
● Rated value (DC)	8.2 V; from internal power circuit supply
Input current
● on wire-break, max.	0.1 mA
● on short-circuit, max.	8.5 mA
for NAMUR encoders
— for signal “0”	0.35 to 1.2 mA
— for signal “1”	2.1 to 7 mA
Input delay (for rated value of input voltage)
● Input frequency (with a time delay of 0.1 ms), max.	2 kHz
for NAMUR inputs
— parameterizable	Yes; 0.1 / 0.5 / 3 / 15 / 20 ms (plus 0.25 ms preparation time)
Cable length
● unshielded, max.	200 m
Encoder
Connectable encoders
● NAMUR encoder	Yes; Two-wire connection
Interrupts/diagnostics/status information
Diagnostics function	Yes
Diagnoses
● Diagnostic information readable	Yes
Diagnostics indication LED
● Group error SF (red)	Yes
● Status indicator digital input (green)	Yes
● Channel fault indicator F (red)	Yes
Ex(i) characteristics
Module for Ex(i) protection	Yes
Maximum values of input circuits (per channel)
● Co (permissible external capacity), max.	3 µF
● Io (short-circuit current), max.	14.1 mA
● Lo (permissible external inductivity), max.	100 mH
● Po (power of load), max.	33.7 mW
● Uo (output no-load voltage), max.	10 V
Potential separation
Potential separation digital inputs
● between the channels	Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area
● between the channels, in groups of	1
● between the channels and backplane bus	Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area
● Between the channels and load voltage L+	Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area
Standards, approvals, certificates
Use in hazardous areas
● Type of protection acc. to EN 50020 (CENELEC)	[EEx ib] IIC
● Type of protection acc. to FM	Class II, Division 2, Group A, B, C, D T4
● Test number PTB	Ex-96.D.2094X
Ambient conditions
Ambient temperature during operation
● max.	60 °C
Connection method
required front connector	20-pin
Dimensions
Width	40 mm
Height	125 mm
Depth	120 mm
Weights
Weight, approx.	230 g