14 Technical Data
14.1 24 V Power Supply
An isolated function low voltage (in accordance with EN60204-1) is to be
ensured by the system power supply.
Rated voltage DC 24 V
Static upper / lower limits DC 20.4 V/28.8V
Dynamic upper / lower limits DC 18.5 V/30.2 V
Non-periodic over-voltages DC 35 V for 500 msec
with a recovery time of 50 sec.
Max. current consumption 500 mA
Typical module power loss 7.5 W
Table 14-1 Data: Power supply 24 V
14.2 Power Supply from S7 Backplane Bus
Current consumption from S7-
300 back-plane bus
Typical 55 mA
Table 14-2 Data: Power supply from S7 backplane bus
14.3 Load Cell Connection
EU type certification as non-automatic weighing
instrument, class III
3 x 6000 d (pi = 0.4)
Precision with Ex-i interface 3 x 6000 d (pi = 0.5)
Error limit conforming to DIN1319-1 from
measurement range end value at 20 °C +
10 K
Measuring range 1mV/V: ≤ 0.01
%
Measuring range 2/4mV/V: ≤
0.005 %
Refresh rate internal / external 2.5 msec/10 msec
Internal resolution 16 million parts
3 measuring ranges 0 to 1 mV/V
0 to 2 mV/V
0 to 4 mV/V
Max. distance to load cell (calibration) 1000 m (500 m)
Max. distance from load cell to Ex-i-Interface in
Ex range
150/500 m for gas group IIC
1000 m for gas group IIB (see
SIWAREX IS device manual)
Lowest permitted input signal for a calibration value
in calibrating operation
≥ 0.5 µV/e
14-126 SIWAREX FTC
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