Siemens S7-400PLC Spécifications Page 126

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Digital modules
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-0AB0)
S7-400 Automation System Module Data
126 Reference Manual, Edition 09/2009, A5E00850736-06
Specifications of the SM 421; DI 16 x UC 24/60 V
Dimensions and weight
Dimensions W x H x D (mm) 25 x 290 x 210
Weight Approx. 600 g
Module-specific data
Number of inputs 16
Cable length
Unshielded input delay
0.5 ms
3 ms
10 / 20 ms
Maximum 100 m
maximum 50 m
maximum 600 m
Shielded cable length
1000 m
Voltages, currents, electrical potentials
Number of simultaneously controlled inputs 16
Electrical isolation
Between channels and the backplane bus
Yes
Between channels
In groups of
Yes
1
Permissible potential difference
Between different circuits
75 VDC, 60 VAC
Isolation test voltage
Channels against backplane bus and load voltage
L +
1500 VAC
Channels among one another
1500 VAC
Current consumption
From the backplane bus (5 V)
Max. 150 mA
Power loss of the module Typ. 8 W
Status, interrupts, diagnostics
Status display Green LED per channel
Interrupts
Hardware interrupt
Programmable
Diagnostic interrupt
Programmable
Diagnostic functions Programmable
Group error display
for internal disruption
for external disruption
Red LED (INTF)
Red LED (EXTF)
Channel error display
None
Reading diagnostics information
Supported
Monitoring of
Wire break
I > 0.7 mA
Injection of substitution values No
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