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021-1BF01 - Signal modules digital | Digital input modules

Order no.


TypeSM 021
Module ID0013 9FC1

General information

Features8x DI
DC 24 V
0.5 ms time delay

Current consumption/power loss

Current consumption from backplane bus35 mA
Power loss0.9 W

Technical data digital inputs

Number of inputs8
Cable length, shielded1000 m
Cable length, unshielded600 m
Rated load voltage-
Current consumption from load voltage L+ (without load)-
Rated valueDC 20.4...28.8 V
Input voltage for signal "0"DC 0...5 V
Input voltage for signal "1"DC 15...28.8 V
Input voltage hysteresis-
Signal logic inputSinking input
Frequency range-
Input resistance-
Input capacitance-
Input current for signal "1"3 mA
Connection of Two-Wire-BEROs possible
Max. permissible BERO quiescent current0.5 mA
Input delay of "0" to "1"max. 500 µs
Input delay of "1" to "0"max. 500 µs
Number of simultaneously utilizable inputs horizontal configuration8
Number of simultaneously utilizable inputs vertical configuration8
Input characteristic curveIEC 61131-2, type 1
Initial data size8 Bit

Status information, alarms, diagnostics

Status displaygreen LED per channel
Process alarmno
Diagnostic interruptno
Diagnostic functionsno
Diagnostics information read-outnone
Module stategreen LED
Module error displayred LED
Channel error displaynone


Between channels-
Between channels of groups to-
Between channels and backplane bus
Insulation tested withDC 500 V


Safety protocol-
Safety requirements-
Secure user address-
Two channels-
Test pulse outputs-


Input bytes1
Output bytes0
Parameter bytes0
Diagnostic bytes0


MaterialPPE / PPE GF10
MountingProfile rail 35 mm

Mechanical data

Dimensions (WxHxD)12.9 mm x 109 mm x 76.5 mm
Net weight57 g
Weight including accessories57 g
Gross weight71 g

Environmental conditions

Operating temperature0 °C to 60 °C
Storage temperature-25 °C to 70 °C


UL certificationyes
KC certificationyes