Digital Modules; Module Overview - Siemens SIMATIC S7-400 Reference Manual

Digital modules

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-)
Number of 32 DI; isolated
inputs in groups of
32
Nominal in‐ 24 VDC
put voltage
Suitable Switches; 2-wire proximity switches (BEROs)
for...
Configura‐ No
ble
diagnostics
Diagnostic No
interrupt
Hardware No
interrupt at
edge transi‐
tion:
Adjustable No
input delays
Substitu‐ -
tion value
output
Special fea‐ High packag‐
tures ing density
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
SM 421; SM 421;
DI 16xDC DI 16xAC
24 V 120 V
(-7BH0x-) (-5EH00-)
16 DI; isolated 16 DI; isolated
in groups of in groups of
8 1
24 VDC 120 VAC
Yes No
Yes No
Yes No
Yes No
Yes -
Quick and Channel-spe‐
with interrupt cific isolation
capability
SM 421; SM 421;
DI 16xUC DI 16xUC
24/60 V 120/230 V
(-7DH00-) (-1FH00-)
16 DI; isolated 16 DI; isola‐
in groups of ted in
1 groups of
4
24 to 60 VUC 120 VAC/
230 VDC
Yes No
Yes No
Yes No
Yes No
- -
Interrupt ca‐ For high, var‐
pability with iable voltag‐
low, variable es
voltages
4
SM 421; SM 421;
DI 16xUC DI 32xUC
120/230 V 120 V
(-1FH20-) (-1EL00-)
16 DI; isola‐ 32 DI; isola‐
ted in groups ted in groups
of of
4 8
120/230 VUC 120 VAC/DC
No No
No No
No No
No No
- -
For high, vari‐ High packag‐
able voltages ing density
Input charac‐
teristic curve
in accord‐
ance with IEC
61131-2
83