Siemens SIWAREX MS, Device Manual

Page: 66 / 75

Technical
Data
11.4 Load Cell Connection
connection STRAIN GAUGE full bridge in 4-
wire or 6-wire technology
Error limit conforming to DIN1319-1 from
measurement range end value at 20 °C + 10 K ≤ 0.05 %
Temperature coefficient span ≤ ±
20 ppm/K v. E
Temperature coefficient zero point ≤ ±
0.1
µ
V/K
Linearity error
≤
0,015%
Refresh rate can be switched 50 Hz or 30 Hz
Internal resolution 65,535 parts
3 measuring ranges 0 to 1 mV/V
0 to 2 mV/V
0 to 4 mV/V
Max. distance to load cell 500 m
Max. distance between load cell and Ex-I interface
in Ex area 150/500 m for gas group IIC
500 m for gas group IIB (see
SIWAREX IS device manual)
Load cell power
Voltage
Maximum current
Typical DC 6 V *
150 mA
Permitted load cell resistance without Ex-I interface
with feed from SIWAREX MS > 40 Ω
< 4010 Ω
Permitted load cell resistance with Ex-i-Interface > 87 Ω
< 4010 Ω
Monitor for sensor inputs
typically ≥ 5.3 V
±
2%
Hysteresis 0.1 V
Response time for sensor line monitor ≤ 1 s
Common mode rejection CMRR @50/60 Hz Typical 80 dB
Low pass filter limit frequency 0.05...5 Hz
Measured value filtering for average value filter 2...255 values
Isolation
500 V (DC)
P P
* Values apply at output of the module
**When using recommended cables (accessories)
Table 11-4 Data: Load cell connection
11.5 RS 232C Interface
Baud rate 9600 baud
Data bits 8
Parity Even
Stop bits
1
Max. distance 15 m
Signal level Conforms to EIA-RS232C
Isolation
500 V (DC)
Table 11-5 Data: RS 232C interface
11-58 SIWAREX MS