Siemens S7-300 - 1.3 Guide to commissioning fail-safe signal modules

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Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Temperature error (with
reference to the input range)
" 0.004 %/K
Linearity error (with
reference to the input range)
" 0.03 %
Repeat accuracy (steady
state at 25 _C, with
reference to the input range)
" 0.1 %
Status, Interrupts, Diagnostics
Interrupts
S Hardware interrupt
S Diagnostic interrupt
Parameters can be
assigned
Parameters can be
assigned
Diagnostic functions
S Group error display
S Diagnostics information
read-out
Red LED (SF)
Possible
Data for Selecting a Sensor
Input range (rated
values)/Input resistance
S Voltage "1 V
" 5 V
" 10 V
1 to 5 V;
/10 MΩ
/100 kΩ
/100 kΩ
/100 kΩ
S Current " 20 mA
0 to 20 mA;
4 to 20 mA:
/50 Ω
/50 Ω
/50 Ω
Maximum input voltage for
voltage input (destruction
limit)
max. 20 V continuous;
75 VDC for no more than
1 s (pulse duty factor
1 : 20)
Maximum input current for
current input (destruction
limit)
40 mA
Connection of the sensor
S For measuring voltage Possible
S For measuring current
As two-wire transmitter Possible
As four-wire transmitter Possible
S Load of the 2-wire
transmitter
(at L+ = DC 24 V)
max. 820 Ω
Characteristic linearization None
2.1 Clock synchronization
Characteristics
Reproducible response times (i.e. times of the same length) are achieved in
SIMATIC by means of an equidistant DP bus cycle and the synchronization of the
following free-running individual cycles:
S Free-running cycle of the user program. On account of cyclic program branches
the length of the cycle time may vary.
S Free-running, variable DP cycle on the PROFIBUS subnet.
S Free-running cycle on the DP slave backplane bus.
S Free-running cycle at signal conditioning and conversion in the electronic
modules of the DP slaves.
With equidistance the DP cycle runs with the same clock pulse and for the same
length. The priority classes of a CPU (OB 61 to OB 64) and the clocked I/Os are
synchronized with this clock pulse. The I/O data are thus transferred at defined,
fixed intervals (clock synchronization).