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This example uses a bar graph RTM to monitor a PLC register that will range in value from 0
to 100. The “Scaling” box will divide the value by 10 to convert the range (0 – 100) to the
range (0 – 10). Then 1 is subtracted to offset the range to (-1 – 9). Remember that just like
strings, when the value is outside the range (0 – 9), the RTM will be blank. Therefore, when
the actual value of the PLC is zero, then the value for the RTM will be “-1” after scaling,
causing the RTM to blank. In order for this to work properly, the PLC register format must be
“Signed Decimal.” This example also uses the increment/decrement keys to ramp the bar
graph up and down by 10% per key press. See the figure below.
Data Entry
Data entry is used when dual purpose keys on the 1024 and 1025 Micro Greyline are used for
entering data to the PLC. When a screen is displayed that contains one or more RTMs with
Data Entry enabled, a flashing cursor will appear at the right-most character of the first RTM.
The left/right arrow keys can be used to move the cursor from one RTM to the next. Once an
RTM is selected by the cursor, the CLR key is used to put the keypad into the data entry
mode. The RTM will blank allowing digits to be entered through the keypad. Once a value is
typed on the screen, the Enter key will send the value to the PLC if it is between the low/high
entry limits.
Hide Data Entry Characters – Sometimes it is necessary to use RTMs to enter passwords into
the PLC. Checking this box will hide the password as it is entered. This attribute has two
effects on a RTM; when the RTM is displayed, asterisks ‘*’ are substituted for each digit
displayed. When the system operator enters data, each entered digit is displayed as a ‘*’.
Low/High Entry Limits - Two attributes, low limit and high limit, are used to restrict the data
that a system operator may enter into the RTM. These limits may not fall outside the natural
bounds of the format selected (i.e. you cannot set a low limit of -5 when decimal format is
selected, negative numbers are not allowed on decimal format).
Inc/Dec Value - This attribute allows the system programmer to set the increment/decrement
rate on each RTM. This is the value that is either added or subtracted from the current RTM
value when the system operator presses either the increment or decrement keys on the OI.
Each RTM has programmable rates. Note that when the system operator hits an entry limit
(either low or high), the offending increment or decrement key no longer has an effect on the
data.
Micro Greyline 1000 Series
microGUS - Version 2.0 • 39