Structures Of Data Registers And File Registers - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4.9.2

Structures of data registers and file registers

1) 16-bit type
One (16-bit) data register or file register can store a numeric value ranging from -32,768 to +32,767.
High
order
b15
Sign
0: Positive
number
1: Negative
number
A numeric value can be read from or written to a data register by an applied instruction usually.
Or a numeric value can be directly read from or written to a data register from a display unit, display module, or
programming tool.
2) 32-bit type
Two serial data registers or file registers can express 32-bit data.
- A data register with a larger device number handles high-order bits, and a data register with a smaller device
number handles low-order bits.
- In the index type, V handles high-order bits, and Z handles low-order bits.
Two data registers or file registers can store a numeric value ranging from -2,147,483,648 to +2,147,483,647.
High
order
0
b31
Sign
0: Positive
number
1: Negative
number
In the case of 32-bit type, when a data register or file register on the low-order side (example: D0) is specified, the
subsequent number on the high-order side (example: D1) is automatically occupied.
Either an odd or even device number can be specified for the low-order side, but it is recommended to specify an
even device number for the low-order side under consideration of the monitoring function of display units, display
modules, and programming tools.
126
D 0 (16 bits)
0 1 0 1 0 1 0 1 0 1 0
D1 (high-order 16 bits)
1 0 1 0 1 0 1 0 1 0
Low
order
1 0 1 0 1
b0
D0 (low-order 16 bits)
1 0 1 0 1 1 1 1 1 0 0
4 Devices in Detail
4.9 Data Register and File Register [D]
0 0 1 1 1 1 0 0 0 0
Low
order
b0