6F3B0250
Basic Hardware and Function 107
6. Programming Information

6.4 I/O allocation

The external input signals are allocated to t he exter nal input devices/register s ( X/XW).
The external output signals are allocated to the external output devices/registers (Y/YW).
The register numbers of the external input and out put register s ar e consecut ive. Thus
one register number can be assigned for either input or output.
As for the T1/T1S basic unit, I/O allocation is fixed as follows.
X000 X007
Inputs: 8 points (X000 - X007)
T1-16 Output s: 8 points (Y020 - Y027)
Y020 Y027
X000 X00D
Inputs: 14 points (X000 - X00D)
T1-28 Output s: 14 points (Y020 - Y02D)
Y020 Y02D
X000 X017
Inputs: 24 points (X000 - X017)
T1-40 / T1-40S Outputs: 16 points (Y020 - Y02F)
Y020 Y02F
Any operation for the I/O allocati on are not required if only the T1/T1S basic unit is used.
How ever, if the option cards, the Expansi on unit and/or the T2 I/O modules are used w ith
the T1-40/T1-40S, the I/O al location operation is necessary. For this information, refer to
the separate manual for Expansion I/O.
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