163
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Sequence Output Instructions
3
KEEP
Hint
• KEEP(011) has an immediate refreshing variation (!KEEP(011)). When an external output bit has
been specified for B in a !KEEP(011) instruction, any changes to B will be refreshed when
!KEEP(011) is executed and reflected immediately in the output bit. (The changes will not be
reflected immediately if the bit is allocated to a Group-2 High-density I/O Unit, High-density Special
I/O Unit, or a Unit mounted in a SYSMAC BUS Remote I/O Slave Rack.)
• KEEP(011) operates like the self-maintaining bit, but a self-maintaining bit programmed with
KEEP(011) requires one less instruction.
Self-maintaining bits programmed with KEEP(011) will maintain status even in an interlock program
section, unlike the self-maintaining bit programmed without KEEP(011).
• KEEP(011) can be used to create flip-flops as shown below.
0.02 0.03
0.02
0.03
5.00
5.00
5.00
KEEP
Output bit C will maintain its
previous status in an interlock.
Output bit C will be turned
OFF in an interlock.
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