Delta RMC151 - Manual (Page 489)

6 Communication
• Cyclic I/O data is always sent between the PLC and RMC at the specified update
time. For example, status information from the RMC, and variables to be written to the
RMC would typically be part of the cyclic data. Cyclic I/O data is defined by the
Incoming and Outgoing Cyclic I/O Data.
• Acyclic data is sent only when it is needed. It is useful for infrequent data transfers,
or for very large data transfers. For example, if the PLC creates a curve and sends it to
the PLC, that data would typically be sent via the acyclic data. Or, if the PLC needs to
read a captured plot from the RMC, that is also best done via the acyclic data. Acyclic
I/O data is defined by the Data Records.
PROFINET Settings in RMCTools
Setting the PROFINET Device Name
The primary identifier for PROFINET nodes is the device name. To set the device name for
the RMC using RMCTools, use the PROFINET Settings page.
Setting up the Outgoing and Incoming Cyclic I/O Data Areas
Each PROFINET I/O connection will cyclically transfer Input data and Output data at the
specified update time. The location of the Outgoing Cyclic I/O Data, sent from the RMC to
PLC, and the location where the Incoming Cyclic I/O Data sent from the PLC to the RMC is
stored must be set in RMCTools using the PROFINET Settings page.
Notice that only the starting address for each data area is specified in RMCTools. The
length of each data block is determined by which input and output module is selected in
the IO-Controller’s PROFINET setup. See Selecting the Input and Output Modules below
for details.
For almost all applications, the starting location for the Outgoing Cyclic I/O Data is left at
its default of the start of the Indirect Data Map area. For most applications, the starting
location for where the Incoming Cyclic I/O Data is stored is also left at its default location
in a separate Indirect Data Map area, but the Variable Table and Command Area are also
plausible destinations.
Selecting the Synchronization Method
The user has the option of including or not including a Sync Register at the beginning of
the Incoming and Outgoing I/O Data. This option is selected in RMCTools on the
PROFINET Settings page. For a description of the benefits of each method, see the Using
a PROFINET I/O Connection topic.
Configuring Custom Data Records
The configuration of Custom Data Records does not need to be completed in order to
establish a PROFINET I/O connection. Custom Data Records apply to acyclic read and
writes and are described fully in the Using PROFINET Record Data topic.
Setting the Byte Order
The RMC supports both Most Significant Byte (MSB) first and Least Significant Byte (LSB)
first. The default is MSB, which should be correct for most PROFINET controllers, including
Siemens S7 PLCs.
Setting the IP Address from RMCTools
PROFINET supports setting the IP address from the PROFINET controller or configuration
tool. However, it is recommended that RMCTools be used to set the IP address in order to
ensure that the RMC is always accessible from RMCTools. To set the IP address for the
RMC, use the Error! Hyperlink reference not valid..
PROFINET Settings in the PROFINET Configuration Software
Once the PROFINET Device Name, Outgoing and Incoming Cyclic I/O Data areas, and
Synchronization Method have been set in RMCTools, the rest of the PROFINET
configuration is done in the PROFINET configuration software, which is specific to the IO-
Controller being used. For Siemens S7 controllers, the HW Config application within
STEP7 is typically used.
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