Siemens SM 338 - 3.1 Mounting

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Product Information on the Reference Manual Programmable Logic Controllers S7-300 Module Data Release 3
A5E00409892-01
Inaccuracy of the frozen encoder value (freeze)
Free running encoder value acquisition
• Maximum age
1)
(2 × Message duration)
+ monoflop time
+ 580 ms
• Minimum age
1)
Message duration
+ 130 ms
• Jitter
Message duration +
monoflop time + 450 ms
Synchronous encoder value acquisition
• Jitter
Max (message
duration
n
+ param.
Monoflop time
n
)
n = 0, 1, 2, (Channel)
Isochrone time of the module
In Standard Mode TWE 850 ms
TWA 620 ms
ToiMin 90 ms
TDPMin 1620 ms
In Fast Mode TWE 700 ms
TWA 0 ms
ToiMin 0 ms
TDPMin 900 ms
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
value encoder < 64
ms + 2 x (1 / baud rate)