Skip to main content
  • 200V

221-1BF50 - Signal modules digital | Digital input modules

Order no.


TypeSM 221

General information

Features8x DI
DC 24 V

Current consumption/power loss

Current consumption from backplane bus10 mA
Power loss2 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 15...28.8 V
Input voltage for signal "1"DC 0...5 V
Input voltage hysteresis-
Signal logic inputSourcing input
Frequency range-
Input resistance-
Input current for signal "1"7 mA
Connection of Two-Wire-BEROs possible
Max. permissible BERO quiescent current1.5 mA
Input delay of "0" to "1"3 ms
Input delay of "1" to "0"3 ms
Number of simultaneously utilizable inputs horizontal configuration8
Number of simultaneously utilizable inputs vertical configuration8
Input characteristic curve-
Initial data size1 Byte

Status information, alarms, diagnostics

Status displaygreen LED per channel
Process alarmno
Diagnostic interruptno
Diagnostic functionsno
Diagnostics information read-outnone
Supply voltage displaynone
Group error displaynone
Channel error displaynone


Between channels-
Between channels of groups to8
Between channels and backplane bus
Insulation tested withDC 500 V


Input bytes1
Output bytes0
Parameter bytes0
Diagnostic bytes0


MaterialPPE / PA 6.6
MountingProfile rail 35 mm

Mechanical data

Dimensions (WxHxD)25.4 mm x 76 mm x 88 mm
Net weight100 g
Weight including accessories-
Gross weight-

Environmental conditions

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


UL certificationyes
KC certification-