Mitsubishi Electric FX3G SERIES Programming Manual page 276

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Related devices

1. Relationship between the flag operation and the sign (positive or negative) of a numeric value

1. When using a 32-bit operation instruction (DSUB or DSUBP)

When specifying word devices, a 16-bit word device on the low-order side is specified first, and then a word device

with the subsequent device number is automatically set for the high-order 16 bits.

To prevent number overlap, it is recommended to always specify an even number, for example.

2. When specifying the same device in the source and destination

The same device number can be specified for both the source and the destination.

In this case, note that the addition result changes in every operation cycle if a continuous operation type instruction

(SUB or DSUB) is used.

ON : When the operation result is 0

OFF : When the operation result is other than 0

ON : When the operation result is less than −32768 (in 16-bit operation) or

−2,147,483,648 (in 32-bit operation)

OFF : When the operation result is not less than −32768 (in 16-bit operation) or

−2,147,483,648 (in 32-bit operation)

ON : When the operation result is more than 32767 (in 16-bit operation) or

2,147,483,647 (in 32-bit operation)

OFF : When the operation result is not more than 32767 (in 16-bit operation) or

2,147,483,647 (in 32-bit operation)

significant bit of

data becomes

− 2,147,483,648

10 Arithmetic and Logical Operation (+, −, ×, ÷) – FNC 20 to FNC 29

→ For the flag operations, refer to Subsection 6.5.2.

significant bit

becomes "0".

(D 0) − 25 → (D 0)

10.2 FNC 21 – SUB / Subtraction

2,147,483,647,

Fx3u series Fx3uc series