
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
93
Digital modules
4
4.1 Module overview
Characteristics of digital modules
The tables below summarize the essential characteristics of the digital modules. This
overview supports you in selecting a module to suit your requirements.
Table 4- 1 Digital input modules: overview of features
Features SM 421;
DI 32xDC
24 V
(-1BL0x-)
SM 421;
DI 16xDC
24 V
(-7BH0x-)
SM 421;
DI 16xAC
120 V
(-5EH00-)
SM 421;
DI 16xUC
24/60 V
(-7DH00-)
SM 421;
DI 16xUC
120/230 V
(-1FH00-)
SM 421;
DI 16xUC
120/230 V
(-1FH20-)
SM 421;
DI 32xUC
120 V
(-1EL00-)
Number of
inputs
32 DI;
isolated in
groups of
32
16 DI; isolated
in groups of
8
16 DI; isolated
in groups of
1
16 DI; isolated
in groups of
1
16 DI;
isolated in
groups of
4
16 DI;
isolated in
groups of
4
32 DI;
isolated in
groups of
8
Nominal
input voltage
24 VDC 24 VDC 120 VAC 24 to 60 VUC 120
VAC/230
VDC
120/230 VUC 120 VAC/DC
Suitable
for...
Switches; 2-wire proximity switches (BEROs)
Configurable
diagnostics
No Yes No Yes No No No
Diagnostic
interrupt
No Yes No Yes No No No
Hardware
interrupt at
edge
transition:
No Yes No Yes No No No
Adjustable
input delays
No Yes No Yes No No No
Substitution
value output
- Yes - - - - -
Special
features
High
packaging
density
Quick and
with interrupt
capability
Channel-
specific
isolation
Interrupt
capability
with low,
variable
voltages
For high,
variable
voltages
For high,
variable
voltages
Input
characteristic
curve in
accordance
with
IEC 61131-2
High
packaging
density
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