II - DCE FEL ČVUT v Praze

Analog value formation
Measuring principle SIGMA-DELTA
Integration time/conversion
time/resolution (per
channel)
configurable
Integration time in ms
Basic conversion time
incl. integration time in
ms (several channels
enabled)
Basic conversion time
incl. integration time in
ms (one channel
enabled)
Resolution in bit + sign
(incl. overrange)
Interference voltage
rejection for interference
frequency f1 in Hz
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
yes yes
2.5 162 yes yes
/3 20 100
7.5 50 60 300
2.5 16 2 /3 20 100
10+
sign
Interfere nce rejection, error limits
13+
sign
13+
sign
15+
sign
400 60 50 10
Interference voltage rejection for f = n x (f1 1 %),
(f1 = interference frequency)
Common-mode
interference channels with
respect to M-terminal of
CPU (UISO < 60 V)
> 130 dB
Normal-mode interference
(measured value +
interference must be
within the input range
0 to 22 mA)
> 60 dB
Crosstalk attenuation between
inputs (UISO < 60 V)
> 130 dB
Operational limit (in total temperature range, referred to
input range)
from 0/4 to 20 mA 0.45 %
Basic error (operational limit at 25 C, referred to input
range)
from 0/4 to 20 mA 0.1 %
Temperature error
(referred to input range)
Linearity error
(referred to input range)
Repeatability (in steady-state
condition at 25 C, referred to
input range)
0.01%/K
0.01 %
0.05 %
Interference rejection, error limits continued
Influence of a HART signal superimposed on the input
signal referred to the input range
Error at integration time
2.5 ms 0.25%
162 /3 ms 0.05%
20 ms 0.04%
100 ms 0.02%
Interrupts, Diagnostics
SIMATIC S7 Ex Analog Modules
Interrupts
Limit interrupt Configurable
channels 0 and 2
Diagnostic interrupt configurable
Diagnostic functions configurable
Group fault indication red LED (SF)
Channel fault indication red LED (F)
per channel
Diagnostic information
readout
possible
Characteristic data for transducer supply
No-load voltage < 25.2 V
Output voltage for
transducer and line at
22 mA transducer current
(50 measuring shunt
incorporated in module)
> 13 V
Data for sensor selection
Input ranges (rated values) /
input resistance
Current 0 to 20 mA;
4 to 20 mA:
Permissible input current for
current input (destruction
limit)
Signal generator connection
40 mA
for current measurement
as 2-wire transducer possible
as 4-wire transducer possible
/50 Ω
/50 Ω
3-67