Lenze Drive Server Bus server S7 getting started Bedienungsanleitung PDF herunterladen (Seite 37)

Busserv er S7

98 Busserver S7 DE/EN 1.0

6 Appendix

6.1 Time load of the PLC cycle

The function blocks are cyclically called. The PLC cycle is permanently under load.

• The exact processing time depends on the computing po wer of the CPU.

• If real communication takes place, processing takes longer than if a block is activated without a

command to be processed.

• When the PLC program is complete, the cycle load can be reduced by activating the expert

mode.

(^ 96)

The below table lists typical processing times for two different CPU types:

Block number Processing time

Operation CPU 412-2 DP (S7-400) CPU 315 -2 DP (S7 -300)

FC90 <0.1ms 0.6 ms

FC91 <0.1ms 0.7 ms

FC92 <0.1ms 0.6 ms

FB90 <1ms 1 ... 7 ms

Expert mode <1ms 1 ... 3 ms

Idle running <1ms 1 ... 2 ms

FB91 1 ... 7 ms

Eypert mode 1 ... 3 ms

Idle running 1 ... 2 ms

6.2 Transfer times

The following characteristics are important for the transfer times.

Tip!

Please note that the times indicated are minimum values.

• If PROFIBUS is under high load or if a complex program i s to be proce ssed, times will rise

accordingly and may be considerably longer.

• Communication disturbances and access to PROFIBUS devices tha t are not available may

substantially affect transfer times.

• Transfer times also depend o n the operating system used. For optimum transfer times, we

recommend to use Windows NT, Windows 2000 or Windows XP.

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Lenze Drive Server Bus server S7 getting started Bedienungsanleitung Seite 37