3.3 Multi-CPU Functions
Sub CPU Synchronization
3-105
3
CPU Unit Functionality
CPU Interface Registers for High-speed Scan
When you set the circuit number on the Module Configuration Definition Tab Page, the ranges of CPU
interfaces for the high-speed scan given in the following table are assigned. The default circuit number is
1.
Data for the registers assigned to the high-speed scan cycle is transferred in the high-speed scan of the Sub
CPU Unit. The data transfer size is the I/O size of the Sub CPU Unit.
You cannot set the same circuit number for more than one Sub CPU Unit on the Module Configu-
ration Definition Tab Page for the Main CPU Unit. You can set the same circuit number for more
than one Sub CPU Unit on the Module Configuration Definition Tab Page for a Sub CPU Unit.
Circuit
Number
Default I/O Registers
Settable Range of I/O Registers
Register Addresses
Size
Register Addresses
Size
1
IW20000 to IW2003F and
OW20000 to OW2003F
64 words each
IW20000 to IW207FF and
OW20000 to OW207FF
2,048 words each
2
IW20800 to IW2083F and
OW20800 to OW2083F
64 words each
IW20800 to IW20FFF and
OW20800 to OW20FFF
2,048 words each
3
IW21000 to IW2103F and
OW21000 to OW2103F
64 words each
IW21000 to IW217FF and
OW21000 to OW217FF
2,048 words each
4
IW21800 to IW2183F and
OW21800 to OW2183F
64 words each
IW21800 to IW21FFF and
OW21800 to OW21FFF
2,048 words each
1. If you change the register size, set a value that is an integral multiple of 16 words (32 bits).
2. You can set register sizes of up to 2,048 words for both input and output registers, but the larger
the register sizes, the longer the processing time.
Information
Information
Data transferred.
OW2
IW2
Main CPU Unit
Sub CPU Unit
Output size:
2,048 words
(fixed)
Data transferred.
IW2
OW2
Input size:
2,048 words
(fixed)
Input size: Set to
between 16 and
2,048 words.
Output size: Set
to between 16
and 2,048 words.
If the I/O size of the
Sub CPU Unit is set to
less than 2,048 words,
the data in this area is
not transferred.
If the I/O size of the
Sub CPU Unit is set to
less than 2,048 words,
the data in this area is
not transferred.
