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; isola‐
ted in
groups of
4
16 DI; isola‐
ted in groups
of
4
32 DI; isola‐
ted in groups
of
8
Nominal in‐
put 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)
Configura‐
ble
diagnostics
No
Yes
No
Yes
No
No
No
Diagnostic
interrupt
No
Yes
No
Yes
No
No
No
Hardware
interrupt at
edge transi‐
tion:
No
Yes
No
Yes
No
No
No
Adjustable
input delays
No
Yes
No
Yes
No
No
No
Substitu‐
tion value
output
-
Yes
-
-
-
-
-
Special fea‐
tures
High packag‐
ing density
Quick and
with interrupt
capability
Channel-spe‐
cific isolation
Interrupt ca‐
pability with
low, variable
voltages
For high, var‐
iable voltag‐
es
For high, vari‐
able voltages
Input charac‐
teristic curve
in accord‐
ance with IEC
61131-2
High packag‐
ing density
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
83