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Ex digital input modules

Article number		6ES7321-7RD00-0AB0
		SM321, 4DI, DC24V, HAZARDOUS AREAS
Supply voltage
Load voltage L+
? Rated value (DC)		24 V
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 NAMUR inputs		4
Input voltage
? 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
Diagnostic messages
? Diagnostic information readable		Yes
Ex(i) characteristics
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
? Potential separation digital inputs		Yes
? between the channels, in groups of		1
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
Weights
Weight, approx.		230 g

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