Creating a Point SECTION 3 Points
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The external source is defined by selecting the appropriate I/O Attributes:
setting. Further configuration of the external source can be applied by clicking
the Setup button.
On clicking the Setup button for a PLC external source, the PLC Attributes
dialog box opens.
The point type associated with the PLC Connection attributes is shown in the
title bar. The required PLC can be selected from the PLC: field. If no PLCs
exist in the PLC: field then one must be added. This is achieved by clicking the
Add PLC button and configuring one. A point cannot be configured to have a
PLC connection unless all the PLC connection attributes are correctly
configured. For more information on adding and configuring PLCs and devices
see chapter 6 Projects, Device Configuration.
3-4-8 PLC Attributes
The Data Location: field identifies the area of memory to which this address
applies and is dependent upon the type and configuration of the PLC.
The Data Type: field identifies the type of data held at this address. The type
determines how point values are converted from a computer format into a PLC
format. The field contains options applicable to the Data Location.
The Modifier: field indicates the command to be performed on the data at this
address. An example of a modifier is for a bit: a modifier might declare that a
bit is to be forced set and not to be written normally. The field contains options
applicable to the Data Location.
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