Instruction Set
Program Control 3-39
program control instructions continued...
Instruction Description
One Shot Falling
OSF
(Enhanced, Ethernet, and
ControlNet PLC-5 processors
only)
Status Bits:
OB - Output Bit
1
SB - Storage Bit
1
The OSF instruction triggers an event to occur one time. Use the OSF instruction whenever an
event must start based on the change of state of a rung from true-to-false, not on the resulting
rung status. The output bit (N7:0/15) is set (1) for one program scan when the rung goes from
true-to-false.
One Shot Rising
OSR
(Enhanced, Ethernet, and
ControlNet PLC-5 processors
only)
Status Bits:
OB - Output Bit
1
SB - Storage Bit
1
The OSR instruction triggers an event to occur one time. Use the OSR instruction whenever an
event must start based on the change of state of a rung from false-to-true, not on the resulting
rung status. The output bit (N7:0/15) is set (1) for one program scan when the rung goes from
false-to-true.
1
These bits are for display purposes only; there is no logical address for them.
ONE SHOT FALLING
Storage Bit B3/0
Output Bit 15
Output Word N7:0
OSF
ONE SHOT RISING
Storage Bit B3/0
Output Bit 15
Output Word N7:0
OSR
Comments to this Manuals