Toshiba T2N - Manual (Page 203)

4. I/O Allocation
190 PROSEC T2N
The input/output registers are composed of 16bits. There are 128 input/
output registers in the T2N. (Therefore 16 input/output signals are stored
in one register)
The input/output register is expressed as follows in user program.
Input Register : XW
Output Register : YW
The above is address of the register (or it is called number of the
register), decimal number from 000 to 127.
Also, each bit of input/output registers (it is called “Device”) is expressed
as follows.
Bit in the input register (input device) : X
Bit in the output register (output device) : Y
The above is address of register and the above is bit position
of the register.
As for bit position, there are 16 positions (0,1,••••,9,A,B,C,D,E,F).
For example, the input devices (X050-X05F) are assigned
corresponding to the input signals as shown below when the 16-point
input module is allocated to input register XW05.
16-point input module
0
1
2
3
X050
X051
X052
X053
F
COM
X05F
(XW05)