Eaton EASY222-DN, User Manual

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DeviceNet functions
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09/10 MN05013007Z-EN
Explicit Messages
Explicit messages are used to transfer low-priority configura-
tion data, general management data or diagnostics data
between two specific devices. This is always a point-to-point
connection in a client/server system, which means that a
response must always be issued by the server after a request
from a client.
Same as for I/O messaging, the prerequisite for explicit
messaging between the is the implementation of a “Connec-
tion Object“, namely the Explicit Messaging Connection
Object“. This can be achieved either by activating an existing
static connection object in the unit, or via the Predefined
Master/Slave Connection Set“, or dynamically across the so-
called UCMM port (Unconnected Message Manager Port) of
a device.
All data of the function relay (easy basic unit) are processed
by means of explicit messages. The master PLC can thus
read/write access the parameters of the following functions.
• Time
• Image data
• Function blocks (counters, timers, analog value compara-
tors,...).