Siemens et 200sp - Current Measurement; High-Speed Output

Configuring/address space
4.3 Pulse train mode
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB
67
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
D
is returned.
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:
Measured
value
27648
D
Maximum measured
value
32511
D
≙ ...
Accuracy
3
Period duration >
333 μs
Period duration <
333 μs
Two-channel opera-
tion
2 A
1
2.37 A
2
±40 mA -40 mA ...
+100 mA
One-channel opera-
tion
(parallel connection)
4 A
1
4.74 A
2
±80 mA -80 mA ...
+200 mA
1
May only be exceeded for a short time.
2
When this current value is exceeded, the ERR_DQA feedback bit will be set.
3
With constant period duration in the respective measuring period.
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:
Minimum value
Maximum value
High-speed output
deactivated
High-speed output
activated
High-speed out-
put deactivated
High-speed
output activated
Pulse duration
10 μs
1,5 μs
85000000 μs (= 85 s)
Period duration
100 μs
10 μs
Frequency
0,02 Hz
10 kHz
100 kHz