Step Response For The Analog Inputs (Ai); Sample Time And Update Times For The Analog Inputs - Siemens SIMATIC S7-1200 Manual
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A.6.3
Step response for the analog inputs (AI)
The following table shows the step response times for the analog inputs (AI) of the CPU, SB
and SM.
Table A- 36
Step response (ms) for the analog inputs
Smoothing selection (sample averaging)
None (1 cycle):
CPU
No averaging
SB
SM
Weak (4 cycles):
CPU
4 samples
SB
SM
Medium (16 cycles):
CPU
16 samples
SB
SM
Strong (32 cycles):
CPU
32 samples
SB
SM
Sample rate
CPU
SB
SM
0V to 10V, measured at 95% (CPU and SB), 0 to full-scale, measured at 95% (SM),
1
A.6.4
Sample time and update times for the analog inputs
Table A- 37
Sample time and update time for SM and CPU
Rejection frequency
(Integration time)
400 Hz (2.5 ms)
60 Hz (16.6 ms)
50 Hz (20 ms)
10 Hz (100 ms)
Sample rate for 8-channel SM is 1.250 ms.
1
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Manual, 11/2011, A5E02486774-04
400 Hz (2.5 ms)
N/A
4.5
4
N/A
10.6
9
N/A
33.0
32
N/A
63.0
61
N/A
0.156
(4 channels)
(8 channels)
Sample time
0.625 ms
1
4.170 ms
5.000 ms
25.000 ms
Integration time selection
60 Hz (16.6 ms)
63
18.7
18
84
59.3
52
221
208
203
424
408
400
4.17
1.042
0.625
4.17
1.25
4.17
Update time for all channels
4-channel SM
2.5 ms
4.17 ms
5 ms
25 ms
Technical specifications
A.6 Specifications for the analog I/O
1
50 Hz (20 ms)
10 Hz (100 ms)
65
130
22.0
102
22
100
93
340
70.8
346
63
320
258
1210
250
1240
241
1200
499
2410
490
2440
483
2410
5
25
1.250
6.250
5
5
8-channel SM
10 ms
4.17 ms
5 ms
25 ms
25
25
CPU AI
N/A ms
4.17 ms
5 ms
25 ms
259
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