csmstr - Omega Engineering

EDITING REAL TAGS
CRIMSON USER MANUAL - MODULAR CONTROLLER
EDITING REAL TAGS
You will recall that real tags represent a single-precision floating-point value. All the tabs
displayed for real tags are exactly the same as those displayed for integer tags, with the
exception that data entered for items such as the value and hysteresis properties of alarms and
triggers may contain decimals. You are thus referred to the sections on integer tags. You will
notice some selections for integer tags that are not applicable to real tags.
EDITING STRING TAGS
You will recall that string tags represent an item of text, this being made up of a number of
individual characters. The following sections describe the various tabs that are displayed on
the right-hand side of the Data Tags window when editing one of the various string tags.
THE DATA TAB (VARIABLES)
The Data tab of a string variable contains the following properties...
• The Mapping property is used to specify if the variable is to be mapped to a
register in a remote device, or if it exists only within the Master. If you press the
arrow button and select a device name from the resulting menu, you will be
presented with a dialog box that will allow a PLC register to be selected.
• The Encoding property is used to specify how text will be packed into mapped
registers that contain more than 8 bits of data. Selecting unpacked will store one
character per register no matter how large the register, leaving the high-order bits
empty. Selecting low-to-high packed mode will store one character in each 8 bits
of the target register, storing the first character in the lowest order bits. Selecting
high-to-low packed mode will store one character in each 8 bits of the target
register, storing the first character in the highest order bits.
• The Length property is used to indicate how many characters of storage should
be allocated for this string. A value need only be entered if you have configured
the variable for retentive storage. Strings that are kept in the Master’s RAM and
not committed to FLASH have no practical limit on their length.
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