Siemens Add 7 AddFEM, Manual

Page: 62 / 148

AddFEM Technical Data
4-11
AddFEM
C79000–G8076–C900–03
Analog Outputs
Number of analog outputs 8
Greatest error at 25
°
C
$
0.15%
Temperature coefficient
$
100 ppm/K
Greatest error across the complete
temperature range
$
0.4%
Digital resolution of the digital–analog
converter 13 bits + preceding sign
Value of the least significant bit (LSB) 8
µ
A
Total system transfer time interval
(TAQD +TAQT) 1 ms
Transient recovery time at changes
across the entire range 0.6 ms
Overshoot 0.2%
Greatest temporary deviation during
each specified electrical disturbance
test Refer to EMC data (Section 4.2)
Configuration of the terminals Refer to Appendix A, connector X4,
Page A-1
Permissible inductive load 1 H
Shutdown cycles of the power supply Up to 10 ms a buffer overrides.
In case of longer failures the starting
operation depends on the software
Conversion process Parallel conversion of all 8 output
channels
Power output range unipolar / over-
flow range / load impedance 0...20 mA/
$
23.5 mA/500
Ω
4...20 mA/–4.96 to +22.96 mA/500
Ω
Power output range bipolar / overflow
range / load impedance
"
20 mA/
"
23.5 mA/500
Ω
"
30 mA/
"
35.55 mA/300
Ω
Power output bipolar (only channels 1
to 4)
1)
"
50 mA/
"
59.26 mA/180
Ω
Monitoring tolerance of the output cur-
rent 4%
Feedthrough between the channels
at:
Direct voltage
50 Hz
60 Hz
v
60 dB
v
60 dB
v
60 dB
Non–linearity
t
0.1%
Output ripple
t
0.1%
1)
The analog outputs 1 to 4 are limited to a mean load of 40 mA in order to
protect the module. The extension of the current range of these outputs to 50
mA / 59.26 mA is only intended for controlling integral–action actuating ele-
ments. To this purpose a max. current of 59.26 mA is provided for a limited
period.
The current is monitored by software and is limited as follows:
Mean–value limitation: At a power output configured to
"
50 mA a first–order
time delay with a time constant of 10 seconds is used to form the mean value
of the output current. It the mean value exceeds a current of 40 mA, the out-
put current and thus also the mean value of the output current is limited to
"
40 mA.
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