Moeller Marine EASY 600 - Manual (Page 7)

7
in Automatic
Interaction –
With Fieldbus Connection
to the Production Process
Commanding, indicating, monitoring and control at Bit level
Even for straightforward sequences, such as in production
processes, the bus connection is worthwhile. The actuator-
sensor interface, AS-i for short, can supply 31 stations
simultaneously with up to 248 binary instructions. AS-i
is the ideal bus connection for machine building. Input and
output data being transmitted in the particularly short time
of only 5 ms means that, for example, several motors can
be started at absolutely the same time (e.g. in mechanical
handling).
The EASY205-ASI communication module makes connecting
to the bus particularly easy. It can be coupled centrally to any
expandable easy basic units, as well as to easy600 and easy800
devices via easy-Link. Then you simply wire the two-core AS-i
cable with the module – and that’s it! The data exchange is
handled at a higher level via an AS-i Master.
Transferring complex programs
More powerful fieldbus systems, such as Profibus DP, are used
for more complex automation tasks in which the user has to
transfer relatively large sets of data, e.g. several analog values,
setpoint values, counter readings or time parameters. Profibus
DP can transfer up to 20 Bytes per station in each bus cycle, and
can link up to 126 stations at distances of up to 1200 m. This
bus connection, the EASY204-DP, makes easy control relays
even more flexible and versatile, because it enables complete
easy parameter sets to be read or even exchanged via the bus.
This comes into its own, for example, where recipes for mixed
products need to be replaced and new parameter values in easy
are therefore required. The time values, clock settings, counter
readings, setpoint or actual values can then be monitored by a
suitable bus master via this high-performance fieldbus system.
Connection to standard fieldbus systems worldwide
The EASY221-CO unit offers the same functions as
those discussed in the paragraph above, for CANopen,
and EASY222-DN for DeviceNet. DeviceNet is used frequently
in the USA and Canada. Easy is thus proven to be a product
for world markets also as far as it networking capability is
concerned.
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