Delta RMC151 - Manual (Page 185)

3 Controller Features
To see which data items are actually captured and stored in the RMC:
1. In the Plot Template Editor, on a plot tab, choose Custom.
2. In the Plotted Data table header, click Show Data Items. These are the plot data
items that you can read via a host controller.
3. The order of the captured data items can be changed by clicking the Up and Down
arrows. To apply any changes to the RMC, click the Download button in the Plot
Template Editor toolbar.
Methods
The RMC provides several methods of reading plots with a host controller:
• Method 1: Read a Captured Plot - Basic
This method is the simplest method, but is limited to a maximum of 2 plots, a
maximum of 4 data sets per plot, and up to the first 4096 samples from each data set
can be read. This method is suitable for use by HMIs with limited sequencing
capabilities and by low-bandwidth media, such as Basic or Enhanced PROFIBUS
modes.
• Method 2: Read a Captured Plot - Advanced
With this method, you can read any plot in the RMC. However, it requires more
sequencing capabilities in the host controller than Method 1.
• Method 3: Read a Continuous Plot - Continuous Data
With this method, you can read a plot continuously. As long as the host controller
reads keep up with the data capture rate, there will be no gaps or overlap in the data.
This method requires sequencing capabilities in the host controller.
• Method 4: Read a Continuous Plot - Newest Data
With this method, you can read a plot continuously. The newest data is always
captured whether or not the data causes an overlap or gap with the last data that was
read. This method requires sequencing capabilities in the host controller.
The methods refer to the registers listed in the Registers section below.
Method 1: Read a Captured Plot - Basic
This method makes it very easy to read plot data, but limits the amount of data that can
be read. This method allows reading from the RMC70 plots 0 and 1 and the RMC150 plots
0 to 7. Only the first 4 data sets of each plot and the first 255 or 4096 samples of each
data set can be read using this method, depending on the communication method:
Communication Method Max
Samples
Modbus RTU, Modbus/TCP, FINS/UDP, Mitsubishi Procedure
Exist, Mitsubishi Bidirectional Protocol
255
PROFINET 2048
DF1, CSP, EtherNet/IP, RMCLink 4096
These sample limits do not necessarily limit the length of the plot in seconds, because the
sample time of the plot can be changed. You can also configure which registers are
plotted. See the Plot Template Editor topic for details.
Due to addressing limitations of the communication protocols themselves, the RMC
cannot provide directly mapped registers for all the plot data. The protocols simply do not
have enough address space for all the data in the RMC. The Basic method strikes a
compromise by providing some of the plot data as directly mapped registers. If you need
to read all the plot data, use one of the other methods.
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