Inaccuracy Of The Frozen Encoder Value (Freeze); Isochrone Time Of The Module; Synchronous Encoder Value Acquisition - Siemens SM 338 Reference Manual

Inaccuracy of the frozen encoder value (freeze)

Free running encoder value acquisition
•
1)
Maximum age
•
1)
Minimum age
•
Jitter

Synchronous encoder value acquisition

•
Jitter
Product Information on the Reference Manual Programmable Logic Controllers S7-300 Module Data Release 3
18
(2 × Message duration)
+ monoflop time
+ 580 ms
Message duration
+ 130 ms
Message duration +
monoflop time + 450 ms
Max (message
duration + param.
n
Monoflop time )
n
n = 0, 1, 2, (Channel)

Isochrone time of the module

In Standard Mode
In Fast Mode
1)
Age of the encoder values determined by the
transfer process and the processing
2)
The following restriction applies to the monoflop
time of the absolute value encoder:
(1 / baud rate) < Monoflop time of the absolute
ms
value encoder < 64
850 ms
TWE
620 ms
TWA
90 ms
ToiMin
1620 ms
TDPMin
700 ms
TWE
0 ms
TWA
0 ms
ToiMin
900 ms
TDPMin
+ 2 x (1 / baud rate)
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