Siemens Simatic S7-300 Specifications Page 76

  • Download
  • Add to my manuals
  • Print
  • Page
    / 190
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 75
&\FOHDQGUHVSRQVHWLPHV
S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
5-16 A5E00105475-03
&DOFXODWLRQ
The (longest) response time is the sum of:
2 x process image transfer time for the inputs +
2 x process image transfer time for the outputs +
2 x operating system processing time +
2 x program processing time +
4 x the runtime of DP Slave message frames (includes processing in the DP
Master) +
I/O delay
The result is equivalent to twice the cycle time + input and output delay + twice the
bus runtime.
VHHDOVR
Calculating method for calculating the cycle/response time.
Reducing the response time with direct I/O access
 5HGXFLQJWKHUHVSRQVHWLPHZLWKGLUHFW,2DFFHVV
5HGXFLQJWKHUHVSRQVHWLPH
You can reach faster response times with direct access to the I/O in your user
program, for example with
L PIB or
T PQW
you can partially avoid the response times described above.
1RWH
You can also achieve fast response times by using process interrupts. Refer to the
following chapters.
Page view 75
1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 189 190

Comments to this Manuals

No comments