Lenze EMF2111IB - Manual (Page 6)

Technical data
Communication times
5
2111 INTERBUS fieldbus module
5.3
5.3.4
L
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):
н
ЕуЕд
= Eе + QU + P × _hF × PKPR × NM −P + MKOQ × i + MKO
t
cycl
Cycle time in [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) .
NO
NM
U
S
Q
O
NM OM PM QM RM SM
Cycle time [ms]
Number of devices connected to the bus
N
Fig. 5.3-1 INTERBUS cycle time for controllers
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