Publication 1747-RM001G-EN-P - November 2008
Data File Organization and Addressing E-23
In the equivalent rungs of the following figure, XIC instruction M0:2.1/1 is
used only in rung 1, reducing the scan time by approximately 1 ms.
The following figure illustrates another economizing technique. The COP
instruction addresses an M1 file, adding approximately 4.29 ms to the scan
time if you are using an SLC 5/02, Series B processor. Scan time economy is
realized by making this rung true only periodically, as determined by clock bit
S:4/8. (Clock bits are discussed in appendix in this manual.) A rung such as
this might be used when you want to monitor the contents of the M1 file, but
monitoring need not be on a continuous basis.
These rungs provide equivalent operation to those of figure A by substituting XIC instruction
B3/10 for XIC instruction M0:2.1/1 in rung 2. Scan time is reduced by approximately 1 ms
(SLC 5/02, Series B processor).
S:4/7 causes the #M1:4.3
file to update the #N10:0
file every 2.56 seconds.
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