Siemens Simatic S7-300 Instrukcja Obsługi Strona 101

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Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-7EH00-0AB0)
S7-300 Module data
Manual, 02/2013, A5E00105505-08
101
Technical specifications
Power loss of the module
L+ = 24 V
L+ = 100 V
typ. 2 W
typ. 6.5 W
Status, interrupts, diagnostics
Status displays green LED per channel
Interrupts
Hardware interrupt
Diagnostic interrupt
Wire break
programmable
programmable
programmable
Diagnostic functions programmable
Group error display
red LED (SF)
Reading diagnostics information
supported
Monitoring for
Wire break
yes, sensing I < 1 mA
Sensor selection data
Input voltage
Rated value
"1" signal
"0" signal
From 15 to 146 V
from -146 V to + 5 V
Input current
"1" signal
Typ. 3.5 mA
Input characteristics to IEC 61131, Type 1
Connection of 2-wire BEROs
Permissible quiescent current
supported
max. 1 mA
Wiring of the signal sensors using a 20-pin front connector
Time/frequency
Input delay
programmable
Rated value
Yes
typ. 0.1/0.5/3/15/20 ms**
Fixed current limitation of the sensor for wire-break detection See previous table for dependence on rated input
voltage and resistance
Overvoltage protection Dehnconnect RK DCO RK ME110; Art. No. 919 923
* To obtain a time stamp accuracy of < 1 ms, the input delay must be configured to 0.1 ms.
** To obtain a high immunity to interference, use a shielded cable and set input delay to 0.1 ms.
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