Current Measurement; High-Speed Output - Siemens ET 200SP Manual

4.3.1.6

Current measurement

The technology module measures the load current at the digital output. The measured value
of the current is returned as an S7 analog value in the MEASURED_CURRENT value in the
feedback interface (Page 76).
A valid measured value is available when the STS_ENABLE feedback bit is set after the first
period duration of the output sequence. The returned measured value is an average of the
measured values that were acquired over a time period of at least one period duration. If a
valid measured value is not available, the value 32767
Note
In order to use the current measurement, the high-speed output must be deactivated.
Measuring range and accuracy
The measuring range and accuracy are dependent on the channel configuration:
Two-channel opera-
tion
One-channel opera-
tion
(parallel connection)
May only be exceeded for a short time.
1
When this current value is exceeded, the ERR_DQA feedback bit will be set.
2
With constant period duration in the respective measuring period.
3
4.3.1.7

High-speed output

The high-speed output function enables an output frequency of a maximum of 100 kHz with
an output current of a maximum of 100 mA. A high-speed output generates very steep
edges. The high-speed output generates signals at a higher frequency, but provides a lower
maximum load current. The high-speed output is only available in two-channel operation.
The following table presents the minimum and maximum pulse duration, period duration and
frequency depending on whether or not the high-speed output is activated:
Pulse duration
Period duration
Frequency
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB
Measured Maximum measured
value
27648 32511
D
2 A
1
4 A
1
Minimum value
High-speed output High-speed output
deactivated
10 μs
100 μs
0,02 Hz
is returned.
D
value
Period duration >
≙ ...
333 μs
D
2.37 A ±40 mA
2
4.74 A ±80 mA
2
High-speed out-
activated put deactivated
1,5 μs 85000000 μs (= 85 s)
10 μs
10 kHz
Configuring/address space
4.3 Pulse train mode
Accuracy
3
Period duration <
333 μs
-40 mA ...
+100 mA
-80 mA ...
+200 mA
Maximum value
High-speed
output activated
100 kHz
67