Toshiba T2N - Manual (Page 205)

4. I/O Allocation
192 PROSEC T2N
4.3
Methods of Input/Output
Allocation
The execution of input/output allocation can be said in other words to be
the carrying out of the registration of input/output allocation information
in system information. The T2N CPU checks whether the I/O modules
are correctly mounted based on this input/output allocation information
when RUN starts-up. Also, at the same time, the correspondence
between the input/output registers (XW/YW) and the I/O modules is
determined based on this input/output allocation information. On the
other hand, the programmer reads this input/output allocation
information when communicating with the T2N and recognizes the
assignment whether input (XW) or output (YW) for every input/output
register address.
There are 2 methods for the registration of input/output allocation
information in system information. These are automatic I/O allocation
and manual I/O allocation.
The registration of input/output allocation information is only available
when the T2N is in the HALT mode but not in the ‘memory protect’ state
(with the exception of the operation mode switch being to P-RUN).
This is a method of causing the T2N to execute the registration of input/
output allocation information. It is carried out by selecting and executing
the Autoset command on the I/O allocation screen of the programmer,
(T-PDS).
When the automatic I/O allocation is executed, the T2N CPU reads out
status of the I/O modules which are mounted (what type of module is
mounted in which position) and registers the input/output allocation
information.
Each I/O module has one of the module types shown on the following
page.
Automatic I/O Allocation
NOTE
The PU235N has built-in Ethernet. The PU245N has both built-in
Ethernet and TOSLINE-S20LP.
When the automatic I/O allocation is executed, the T2N CPU detects
whether built-in network is or not automatically.
"ETHER" is displayed in the case of PU235N and "E/S" is displayed
in the case of PU245N on the CPU of the input/output allocation
information screen of the programmer.
Allocation of built-in network is not needed when manual I/O allocation.