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Selecting this parameter from the Numeric Data menu will bring up the Numeric
Data Entry screen that will allow you to enter the desired Timeout period. This
should be done after selecting the correct protocol (see above).
Comm Data Mapping
There are two Common Interface Tables (CIT’s) available for communications
use, “Small” and “Large”. They represent a data structure containing some fixed
elements and some that you can configure. The small data map (CIT) is exactly
the same as previous Merrick controllers (i.e. MC³) to maintain compatibility.
The large data map exposes some additional data and can be used in more
complex systems. For a complete description of the CIT, please see our web-
site at www.merrick-inc.com/mct
This parameter is valid and will appear in the Numeric Data menu only if one of
the following protocols is selected:
• ScaleNet
• DF1
• Modbus RTU
• Modbus ASCII
• Modbus TCP
Selecting this parameter from the Numeric Data menu will bring up a screen
that will allow you to select either the small (default) or large data map. This
should be done after selecting the correct protocol (see above).
Write Protection
This parameter allows you to protect certain data in the data map from being
overwritten.The write protection property should be set when a register is
tagged for monitoring only. When writing to words that are write protected, the
corresponding Tag n W value changes accordingly, but the corresponding MC³
register (Tag n R Value) is unaffected. This is useful for testing data transfers to
the GCM before they are implemented, or when you need to change a variable
only at certain instances. Individual data may be write-protected or not. Typical
values for this parameter are:
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