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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.13 SET, RST
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
Explanation of function and operation
SET instruction drives the coil for an output relay (Y), auxiliary relay (M), state relay (S) and bit specification of data
register (D).
1. When using a bit device
SET instructions located in parallel can be used consecutively as many times as necessary.
In the program example shown below, "RST Y000" after "SET Y000" corresponds to this usage.
2. When using a word device (timer or counter)
Use RST instruction to reset a counter or retentive type timer.
1) Program example of an internal counter
C0 up-counts the number of turning ON from OFF at X011. When
the counting result reaches the set value K10, the output contact C0
is activated. Even if X011 changes from OFF to ON after that, the
current value of the counter remains unchanged and the output
contact remains activated.
For clearing the counter and returning the output contact, X010 is set
to ON.
It is necessary to specify a constant K or data register number for
indirect specification after OUT C instruction.
In the case of latched (battery backed) type counters, the current
value and the operation status/reset status of the output contact are
latched even after power failure.
2) Program example of a high speed counter
For 1-phase 1-input counters C235 to C245, use special auxiliary
relays M8235 to M8245 for specifying the counting direction.
X010 in ON status: Specifies down counting.
X010 in OFF status: Specifies up counting.
When X011 turns ON, the output contact of the counter CUUU is
returned and the current value of the counter CUUU is reset to "0".
In counters with reset input (C241, C242 ...), the same situation is
achieved by interrupt operation when the corresponding reset input
turns ON, but any program is not required for this operation.
When X012 turns ON, turning ON/OFF of a counting input X000 to
X005 determined according to the counter number is counted.
In counters having start input (C244, C245 ...), counting is started
only after the corresponding input turns ON.
When the current value of a counter increases and reaches the set
value (K or contents of D), the output contact is set. When the
current value decreases and reaches the set value, the output
contact is reset.
As a contact driving the counting coil of a high speed counter, program a contact which is normally ON when high
speed counting is executed.
If an input relay (X000 to X005) assigned for high speed counters is used for driving the counting coil, accurate
counting cannot be achieved.
ON
ON
ON
Circuit program List program Timing chart
X000
SET Y000
X001
RST Y000
X000
X001
Y000
0 LD X000
1
SET
Y000
2 LD X001
3
RST
Y000
SET
instruction
RST
instruction
X010
RST C 0
X011
C 0
Y000
C 0
K10
X010
M8
UUU
Counting direction
X011
RST C
UUU
Sequence reset
circuit
X012
C
UUU
K or D
C
UUU
Y002
Counting coil