Siemens Simatic S7-400

Signal Modules of the S7-400
3-6
Automation System S7-400 Configuration and Use
A5E0044271 1-02
Performance Characteristics of the Digital Modules
Table 3-1 provides an overview of the performance characteristics of the S7-400
digital modules.
Table 3-1 Performance Characteristics of the Digital Modules
Module
Performance characteristics
Digital input module SM 421
DI 32 x 24 V DC
6ES7421-1BLxx-0AA0
• 32 inputs, isolated in a group of 32
• Rated input voltage 24 V DC
• Suitable for switches and 2/3/4 wire proximity switches (BEROs,
IEC 61131-2; Typ 1)
DI 16 x 24 V DC
6ES7421-7BHxx-0AB0
• 16 inputs, isolated in 2 groups of 8
• Very fast signal processing: Input filter from 50 µs
• Rated input voltage 24 V DC
• Suitable for switches and 2/3/4 wire proximity switches
(BEROs, IEC 61131-2; Typ 2)
• 2 short-circuit-proof encoder supplies for 8 channels each
• Optional external redundant power supply to supply encoders
• “Encoder supply (Vs) OK” status display
• Group error display for internal and external faults
• Programmable diagnostics
• Programmable diagnostic interrupt
• Programmable hardware interrupt
• Programmable input delays
• Programmable substitute values in the input range
DI 16 x 24/60 V UC
6ES7421-7DHxx-0AB0
• 16 inputs, isolated in 16 groups of 1
• Rated input voltage 24 V UC to 60 V UC
• Suitable for switches and 2-wire proximity switches (BEROs)
• Suitable as active high and active low input
• Group error display for internal and external faults
• Programmable diagnostics
• Programmable diagnostic interrupt
• Programmable hardware interrupt
• Programmable input delays
DI 16 x 120/230 V UC
6ES7421-1FHxx-0AA0
• 16 inputs, isolated in 4 groups of 4
• Rated input voltage 120/230 V UC
• Suitable for switches and 2-wire proximity switches
With a second version:
• Input characteristic curve according to IEC 61131-2; Ty pe 2