Moeller PS 416-BGT-4 Series, Hardware And Engineering, Page: 135 / 150

Appendix
132
02/98 AWB 27-1208-GB
System/data times
Table 21: System/data times
TS = System time (ms)
TD = Data time (ms)
The cycle time can be approximated using the
following equations:
n = Number of slaves
SD
i
= Number of send data bytes (output byte)*)
RD
i
= Number of receive data bytes (input byte)*)
TS = System time
TD = Data time
FB
b
= FactorBus best
FP
b
= FactorProgram best
FB
w
= FactorBus worst
FP
w
= FactorProgram worst
T
prog
= Program time
*) see Table 23 in Appendix
The number of data bytes that are exchanged with
the different stations via Suconet should also be
taken into account for the cycle time calculation
(see also Table 23).
without CRC with CRC
Factor 187.5 Kbaud 375 Kbaud 187.5 Kbaud 375 Kbaud
FS 1.65 1.42 1.65 1.42
FD 0.078 0.048 0.19 0.162
T
react(best)
FB
b
(TS TD (SD
i
+
i = 1
n
∑
RD
i
)
FP
b
T
prog
×
+ +
×
=
T
react(worst)
FB
w
(TS TD (SD
i
+
i = 1
n
∑
RD
i
)
FP
w
T
prog
×
+ +
×
=
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