ELAU PacDrive M, Руководство по эксплуатации

Страница: 20 / 88

P
D
M
_
OpM
a
P
rof
i_06_us
.f
m
page 20 field bus PROFIBUS-DP PacDrive™ M
6 Configuration, Parametrization
Ko
rr
ek
tu
ra
us
dr
uc
k
6.2.3 Information on the WAGO Bus Coupler
System structure
Fig. 6-2: Structure of a WAGO connector block
There are two cycles in which a data exchange is taking place.
The data are exchanged between the IO clamps and the bus
coupler via the internal K bus. This bus runs with a cycle time of
typically 2 ms with purely digital IO clamps. With analog clamps,
this cycle takes at least 5 to 10 ms. In addition, the cycle time rises
with the number of configured clamps on the bus coupler. The cycle
of the K bus can be synchronized with the Profibus cycle by means
of the Profibus parameter Process image update = “cycle
synchronous“.
The Profibus cycle is given by the master. With each Profibus cycle,
the data of the output clamps are received and the data of the input
clamps are sent.
Example on reaction time
In synchronous mode at least three Profibus cycles are necessary
to bring a reaction of an output value via a bridge to an input back
input
output
IO data
IO clamp
PROFIBUS-DP
bus coupler
clamps
K-Bus