12BTECHNICAL DATA
13 Technical data
13.1 24 V power supply
SIWAREX U weighing modules are designed for operation with SELV
(Safety Extra Low Voltage).
Accordingly, only SELV (Safety Extra Low Voltage) power supply
connections may be connected in accordance with
IEC950/EN60950/VDE0805.
An isolated function low voltage (in accordance with EN60204-1) is to be
ensured by the system power supply.
Rated voltage DC 24 V input via the front connector
(reverse polarity protection)
Upper/lower limits static DC 20.4 V/28.8V
Upper/lower limits dynamic DC 18.5 V/30.2 V
Non-periodic excess voltage DC 35 V for 500 ms
with a recovery time of 50 s.
Maximum current consumption
(with rated voltage)
150 mA(single-channel)/240 mA
(double-channel)
Starting current surge at 25°C
(typical)
2.4 A
Power loss of the module typical 3.6W (single-channel)/5.8W
(double-channel)
Table 13-1 Data: Power supply 24 V
13.2 Power supply from the S7 backplane bus
Current consumption (5 V) from
the -backplane bus
< 100 mA
Table 13-2 Data: Power supply from the S7 backplane bus
13.3 Load cell activation
Error limit in accordance with DIN1319-1 from
measurement range end value at 20 °C +
10 K
≤ 0.05 %
Update rate 50 Hz
Resolution internal 65,535 parts
Display range of the weight values -32,768 to 32,767
3 measurement ranges 0 to 1 mV/V
0 to 2 mV/V
0 to 4 mV/V
Temperature coefficient range
≤ ± 10 ppm/K v. E.
Adjustment zero temperature coefficient
≤ ± 0.3 μV/K
Max. distance of LC 500 m *
13-72
SIWAREX U
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