Siemens SIWAREX WP251, Руководство пользователя

Страница: 204 / 220

Technical specifications
13.1 Technical specifications
SIWAREX WP251
204
Manual, 12/2015, A5E37203357A
Maximum cable length between junction box and WP251 1000 m (3280 ft)
Common mode voltage range 0 V to 5 V
DMS supply
3)
4.85 V DC +2/-3 %
Short-circuit and overload protection Yes
Connection 6-wire
Sensor voltage monitoring ≤ 0.3 V
Min. DMS input resistance
• without Ex-i
interface
SIWAREX IS
40 Ω
• with Ex-i inter-
face SIWAREX
IS
50 Ω
min. DMS output resistance 4 100 Ω
Temperature coefficient range ≤ ± 5 ppm/K v. E.
Temperature coefficient zero point ≤ ± 0.1 μV/K
Linearity error ≤ 0.002%
Measured value filtering Low pass
Electrical isolation 500 V AC
50 Hz / 60 Hz noise suppression CMRR > 80 dB
Input resistance
•
Signal cable
typ. 5*10
6
Ω
• Sensor cable
typ. 60*10
6
Ω
1)
Relative accuracy! (Absolute accuracy is only reached by calibration on-site with calibration stand-
ard)
2)
Accuracy for module replacement or theoretical calibration decisive
3)
Value valid at sensor; voltage drops on cables are compensated up to 5 V
Analog output
The set replacement value is output in case of a fault or SIMATIC CPU stop.
Table 13- 4 Technical specifications:
Error limit according to DIN 1319-1 of full-scale
value at 20 °C +10 K
0 ... 20 mA: ≤ 0.5%
4 ... 20 mA: ≤ 0.3%
Refresh rate ≤ 100 ms
Resolution 14 bit
Measuring ranges 0 mA to 20 mA
4 mA to 20 mA
Max. output current 24 mA
Error signal (if configured (FW)) 22 mA
Max. load 600 Ω
Temperature coefficient range ≤ ± 25 ppm/K v. E.
Temperature coefficient zero point typ. ± 0.3 μA/K
Linearity error ≤ 0.05%