Toshiba T2N User Manual download pdf (Page 202)

User's manual 189

4. I/O Allocation

The state of external input signals inputted to T2N input modules is read

via the input registers/devices (XW/X or IW/I) when scan control is

executed. On the other hand, the output data determined in user

program execution are outputted to output modules via output registers/

devices (YW/Y or OW/O) and outputs from the output modules to

external loads are based on these data.

Input/output allocation is the execution of mapping between input

registers/devices and input modules and of mapping between output

registers/devices and output modules. In other words, physical devices

called I/O modules are allocated to logic devices called registers/devices.

Input registers/devices and output registers/devices do not use their own

independent memory areas. They use a series of memory areas which

can be said to be input/output registers/devices (a register address

range of 128words from 000 to 127).

By executing input/output allocation, function type determination is

carried out by making addresses allocated to input modules input

registers/devices and addresses allocated to output modules output

registers/devices.

Note) Addresses not allocated to I/O modules are output (YW)

internally.

4.1

Overview

Input/Output Registers

Input/output

allocation

execution

32-point input

16-point output

Input signal ‘A’

Input signal ‘B’

Output signal ‘C’

Output signal ‘D’

I/O Modules

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Toshiba T2N User Manual Page 202