Data Transfer File Instructions
Chapter 12
127
Figure 12.6
Status
Bits for Complete Mode
Rung
Condition
Enable Bit (17)
Done Bit (15)
Instruction Operation
1
Scan
A =
Status bits are reset to zero and
counter is reset to word 1.
Distributed Complete Mode
In cases where is is not necessary that the file operation be completed in
one program scan, it may be advantageous to distribute the file operation
over several program scans. This is to avoid overextending the scan time of
any one program scan. This scan can be done by selecting the distributed
complete mode. Any rate per scan, R, can be chosen where 0<R<4 file
length.
When the rung containing the file instruction goes true, the number of
words equal to the rate per scan is operated upon during one scan. This
process is repeated over a number of scans, until the entire file has been
operated upon. Figure 12.7 shows the operation of the file instruction in
the distributed complete mode.
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