Lenze EMF2111IB Manual de usuario descargar pdf (Pagina 6)

Technical data

Communication times

2111 INTERBUS fieldbus module

5.3

5.3.4

5.3-2

EDSIBS-1.0-06/2003

5.3.4 Communication times

5.3.4.1 Cycle time

The cycle time of a communication system is the time needed to exchange all

process data

(¶ 5.6-6) between the INTERBUS master and the devices connected

to the bus.

It depends on the communication system data and is calculated as follows

(example: baud rate of 500 kbit/s):

ÅóÅä

= Eå + QU + P × _hF × PKPR × NM

−P

+ MKOQ × i + MKO

cycl

Cycletimein[ms]

n Sum of all data bit in the INTERBUS ring

BT Number of bus terminals

L Length of remote bus cable in [km]

Fig. 5.3-1 is shows the ratio between cycle time and number of connected

controllers.

The indicated values refer to the connection of Lenze controllers (e. g. 2XX) with

48 data bits (1 parameter data word + 2 process data words, see

(¶ 5.3-1).

PM QM

RM SM

Cycletime[ms]

Number of devices connected to the bus

Fig. 5.3-1 INTERBUS cycle time for controllers

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Lenze EMF2111IB Manual de usuario Pagina 6