Set, Rst - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
7.13

SET, RST

Outline
1) Setting a bit device (SET instruction (set bit device latch ON))
When the command input turns ON, SET instruction sets to ON an output relay (Y), auxiliary relay (M), state relay
(S) and bit specification (D .b) of word device.
Even if the command input turns OFF after that, the device which was set to ON by SET instruction remains ON.
2) Resetting a bit device (RST instruction (reset bit device OFF))
RST instruction resets an output relay (Y), auxiliary relay (M), state relay (S), Timer (T), counter (C) or bit
specification (D .b) of a word device.
Use the RST instruction to reset (set to OFF) a device which was set to ON by SET instruction.
3) Clearing the present value of a word device (RST instruction reset bit device OFF))
RST instruction clears the current value of a timer (T), counter (C), data register (D), extension register (R) or
index register (V)(Z).
RST instruction can be used to clear to "0" the contents of a data register (D) or index register (V)(Z). (The same
result can be obtained by MOV instruction which transfers the constant K0.)
RST instruction can be used also to reset the current value and return the contact of retentive type timers T246 to
T255.
SET and RST instructions can be used for the same device as many times as necessary in an arbitrary order.
1. Instruction format
SET
SET
RST
Reset
2. Applicable devices
Bit Devices
Instruc-
System User
tion
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
SET
1
RST
1
1: Special auxiliary relays (M) and 32-bit counters (C) cannot be indexed with index registers (V and Z).
2: State relays (S) cannot be indexed with index registers (V and Z).
3: "D .b" is available only in FX
4: This function is supported only in FX
Mnemonic
Basic Instruction
SET
−
Mnemonic
Basic Instruction
RST
−
Digit Specification
3
2
3
1 2
and FX PLCs. However, index modifiers (V and Z) are not available.
3U 3UC
/FX
3U 3UC
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
→ For the number of instruction steps, refer to Section 7.15.
Word Devices
Special
System User Index
Unit
V Z Modify K H
2 2 2 2 2 2
PLCs.
7 Basic Instruction
7.13 SET, RST
Others
Con- Real Charac-
Pointer
stant Number ter String
E " "
4
4
213
1
2
3
4
5
6
7
P
8
9
10