Inv - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
7.10

INV

Outline
1. Instruction Format
INV instruction inverts the operation result up to just before INV instruction, and does not require device
number specification.
INV
Inverse
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
INV
Explanation of function and operation
1. INV instruction (inverts the result of operations)
Circuit program
X000
In the figure above, Y000 turns ON when X000 is OFF, and Y000 turns OFF when X000 is ON.
INV instruction can be used in a same position as serial contact instructions (AND, ANI, ANDP and ANDF).
Different from LD, LDI, LDP and LDF instructions shown in the list, INV instruction cannot execute connection
to bus lines.
independently in parallel to a contact instruction.
2. Operation range of INV instruction
When INV instruction is used in a complicated circuit containing ORB and ANB instructions, the operation
range of INV instruction is as shown in the figure below:
LD
LD
LD
INV instruction inverts the operation result after LD, LDI, LDP or LDF instruction located before INV
instruction.
Accordingly, if INV instructions are used inside ORB and ANB instructions, blocks after LD, LDI, LDP or LDF
instruction seen from each INV instruction are regarded as the target of INV operation.
216
Mnemonic
Basic Instruction
INV
1 step
−
Digit Specification
List program
0 LD
1 INV
Y000
2 OUT Y000
Different from OR, ORI, ORP and ORF instructions, INV instruction cannot be used
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
Word Devices
Special
System User
Unit
There are no applicable devices.
Timing chart
X000
X000
OFF
ON
Y000
Operation result until just
before INV instruction
LD
LD
LD
Con- Real
Index
stant Number
V Z Modify K H E
ON
OFF
ON
OFF
Operation result after INV
instruction is executed
OFF
ON
Inverted
7 Basic Instruction
7.10 INV
Others
Charac-
Pointer
ter String
" " P
ON
OFF