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Simatic S7, Digital Input SM 326, F-DI 24x 24VDC, failsafe digital input f. Simatic S7 FailSafe systems, w. diagnost. interrupt, uo to cat.4(EN9S4-1)/ SIL3(IEC61508)/ PLE (IS013849), 40pin, Siemens

Supply voltage
Rated value (DC)		24 V
Reverse polarity protection		Yes
Input current
from load voltage L+ (without load), max.		450 mA
from backplane bus 5 V DC, max.		100 mA
Encoder supply
Number of outputs		4; Isolated
Output current
● Rated value		400 mA
Power loss
Power loss, typ.		10 W
Digital inputs
Number of digital inputs		24
Number of simultaneously controllable inputs
all mounting positions
— up to 40 °C, max.		24
— up to 60 °C, max.		24; (at 24 V) or 18 (at 28.8 V)
Input voltage
● Type of input voltage		DC
● Rated value (DC)		24 V
● for signal "0"		-30 to +5V
● for signal "1"		+11 to +30V
Input current
● for signal "0", max. (permissible quiescent current)		2 mA
● for signal "1", typ.		10 mA
Input delay (for rated value of input voltage)
for standard inputs
— at "0" to "1", max.		3.4 ms
— at "1" to "0", max.		3.4 ms
Cable length
● shielded, max.		200 m
● unshielded, max.		100 m
Encoder
Connectable encoders
● 2-wire sensor		Yes; if short-circuit test is deactivated
— permissible quiescent current (2-wire sensor), max.		2 mA
Interrupts/diagnostics/status information
Diagnostic functions		Yes
Alarms
● Diagnostic alarm		Yes
Diagnostic messages
● Diagnostic information readable		Yes
Diagnostics indication LED
● Fail-safe operation		Yes
● Group error SF (red)		Yes
Ex(i) characteristics
Maximum values of input circuits (per channel)
● Ta (permissible ambient temperature), max.		60 °C
Potential separation
Potential separation digital inputs
● between the channels		Yes
● between the channels, in groups of		12
● between the channels and backplane bus		Yes
Isolation
Isolation tested with		500 V DC/350 V AC
Standards, approvals, certificates
Highest safety class achievable in safety mode
● acc. to DIN VDE 0801		AK 6
● acc. to EN 954		Cat. 4
● SIL acc. to IEC 61508		SIL 3
Connection method
required front connector		40-pin
Dimensions
Width		80 mm
Height		125 mm
Depth		120 mm
Weights
Weight		442 g
last modified:		11/21/2017