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E
E-17GFK-0804B Appendix E Data Acquisition, Logging, and Display Program
Data Limits Format – &L,X,YYYYY,Low_Limit,Hi_limit
Use this setup string format to specify a high and low limit for a register, input, or output.
If the specified item exceeds either limit, the word HIGH or LOW appears on the
Auto-polling display. In addition, the item blinks.
Limits are also used to control data logging to disk. Data logging occurs only if a data item is
beyond one of its limits, AND if the data logging interval (see the next page) is set to some
non-zero value. If you want to log everything on a screen regardless of status, then set the
limit(s) on some data item so that it will always be out of range. For example, if you wanted
to trigger on output bit Q27, you could set the limits of Q27 as &L,Q,27,0,0. Logging would
occur whenever Q27 was set to 1. When Q27 was equal to 0, logging would stop. You
could then manually control the logging with a hardwired switch in the PLC, or with the
^H and ^L commands available in the auto–screen and manual modes.
This formatting string is normally located below the first 21 lines of the screen, to
de–clutter the screen and allow for more space for other items. It can be located in the
first 21 lines if desired, however.
Enter a Data Limits String for each data item to be assigned limits.
Format:
&L,X,YYYYY,Low_Limit,Hi_Limit
High limit
Low limit
Y = reference address of R, I, or Q
X = R, I, or Q (registers, inputs, or outputs)
L = limit information follows
Example:
&L,R,32,–10000,+13000
High limit
Low limit
32 = reference address
Registers
L = limit information follows
Use comma to separate the individual items. Do NOT use commas within a limit,
however (e.g. don’t enter “–10,000”).
&L indicates the data to follow is limit information
X R,Q, or I (capitals only)
YYYYY Reference to which the limit will be applied – 1 to 5 decimal digits.
Low_limit Any number within the available display range. Enter this number in
signed decimal, regardless of the format in which the actual data will be
displayed (see the previous page).
Hi_limit Any number within the available display range. Enter this number in
signed decimal, regardless of the format in which the actual data will be
displayed.