Siemens Add 7 AddFEM Manual page 62

AddFEM
Number of analog outputs
Greatest error at 25°C
Temperature coefficient
Greatest error across the complete
temperature range
Digital resolution of the digital–analog
converter
Value of the least significant bit (LSB)
Total system transfer time interval
(TAQD +TAQT)
Transient recovery time at changes
across the entire range
Overshoot
Greatest temporary deviation during
each specified electrical disturbance
test
Configuration of the terminals
Permissible inductive load
Shutdown cycles of the power supply
Conversion process
Power output range unipolar / over-
flow range / load impedance
Power output range bipolar / overflow
range / load impedance
Power output bipolar (only channels 1
1)
to 4)
Monitoring tolerance of the output cur-
rent
Feedthrough between the channels
at:
Direct voltage
50 Hz
60 Hz
Non–linearity
Output ripple
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.
AddFEM
C79000–G8076–C900–03
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Analog Outputs
8
$0.15%
$100 ppm/K
$0.4%
13 bits + preceding sign
8 µA
1 ms
0.6 ms
0.2%
Refer to EMC data (Section 4.2)
Refer to Appendix A, connector X4,
Page A-1
1 H
Up to 10 ms a buffer overrides.
In case of longer failures the starting
operation depends on the software
Parallel conversion of all 8 output
channels
0...20 mA/$23.5 mA/500 Ω
4...20 mA/–4.96 to +22.96 mA/500 Ω
"20 mA/"23.5 mA/500 Ω
"30 mA/"35.55 mA/300 Ω
"50 mA/"59.26 mA/180 Ω
4%
v 60 dB
v 60 dB
v 60 dB
t 0.1%
t 0.1%
Technical Data
4-11