Keep Relay : K; Link Relay : L; Step Control Relay : S - LSIS MASTER-K200S Instructions & Programming

Chapter 2. Functions
2.3.3

Keep relay : K

The K area functions as same as M area. However, the operation results are retained if the PLC
is switched on or turned to RUN mode. The K area can be cleared by following methods;
put the initialization routine in the sequence program.
-
- Run the data clear function of hand-held loader (KLD-150S)
Run the data clear function of graphic loader (KGL-WIN)
-
2.3.4

Link relay : L

The L area is the internal memory for use in a data or computer link system. It can be used as
same as M area if no link module is mounted on the PLC system. With K200S / K300S /
K1000S, it is possible to change the range of latch area by parameter setting. For the detail
usage of L area, please refer the list of link relay at appendix and the computer link user's
manual.
2.3.5

Step control relay : S

The S area can be used for two kinds of step control according to the instruction – OUT or SET.
If the OUT instruction is used, the S area functions as last- in priority. Otherwise, it functions as
sequential control. (See the chapter 4 for detailed usage.)
When the CPU is switched on or turned to RUN mode, the S area will be initialized as first step
(Sxx.00) except the latch area designated by parameter setting.
OUT
OUT
OUT
SET
SET
SET
SET
SET
S00.02
S00.29
S00.61
S00.01
S00.02
S00.03
S00.04
S00.00
2-8
In the same group, the last-in condition has the
priority to run.
Sequential control means that a certain process
can be executed only after the previous process
is completed.
The clear condition (Sxx.00 ) can be operated at
any time while the sequential process is
running.