GE GFK-0804B manual Data Limits Format ± &L,X,YYYYY,LowLimit,Hilimit

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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-pollingdisplay. 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 ª±10,000º).

&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.
GFK-0804B	Appendix E Data Acquisition, Logging, and Display Program		E-17