Instructions
Description
Timer Done Bit DN (Bit 13)
Timer Timing Bit TT (Bit 14)
Timer Enable Bit EN (Bit 15)
SOR
Start of Rung
Marks the beginning of a new rung.
SUB
Subtract
Use the SUB instruction to subtract one value (source B) from another (source A) and place
the result in the destination.
Timer Off Delay
Use the TOF instruction to turn an output on or off after its rung has been off for a present
time interval. The TOF instruction begins to count millisecond intervals when the rung makes
a true to-false transition. As long as rung conditions remain false, the timer increments its
accumulated value (ACC) each millisecond until it reaches the present value (PRE). The
accumulated value is reset when rung conditions go true regardless of whether the timer has
timed out. The Time Base must be 10 msec. The timer will not work in any other Time Base.
Timer Done Bit DN (Bit 13)
TOF
Timer Timing Bit TT (Bit 14)
Timer Enable Bit EN (Bit 15)
Timer On Delay
Use the TON instruction to turn an output on or off after the timer has been on for a present
time interval. The TON instruction begins to count millisecond intervals when rung conditions
become true. As long as rung conditions remain true, the timer adjusts its accumulated value
(ACC) each evaluation until it reaches the present value (PRE). The accumulated value is
reset when rung conditions go false, regardless of whether the timer has timed out. The Time
Base must be 10 msec. The timer will not work in any other Time Base.
TON
Timer Done Bit DN (bit 13)
Timer Timing Bit TT (bit 14)
Timer Enable Bit EN(bit 15)
XIC
Examine If Closed
Use the XIC instruction in the ladder program to determine if a bit is on. When the instruction
is executed, if the bit addressed is on (1), then the instruction is evaluated as true. When the
instruction is executed, if the bit addressed is off (0), then the instruction is evaluated as
false.
XIO
Examine If Open
accumulated value is equal to
or greater than the present
value
rung conditions are true and
the accumulated value is less
than the present value
rung conditions are true
This Bit
rung conditions go false and
the accumulated value is
greater than or equal to the
present value
rung conditions are false and
the accumulated value is less
than the present value
rung conditions are false
This Bit
accumulated value is equal to
or greater than the present
value
rung conditions are true and
the accumulated value is less
than the present value
rung conditions are true
the appropriate RES
instruction is enabled
Rung conditions go false or
when the done bit is set
rung conditions go false or if
the timer is reset with the RES
instruction
Is Set When
And Remains Set Until One
rung conditions are true
rung conditions go true or
when the done bit is set
rung conditions go true
Is Set When
And Remains Set Until One
rung conditions go false
rung conditions go false or
when the done bit is set
rung conditions go false
SC Series Controllers
Embedded PLC
of the Following
of the Following
109 / 1032
