Transfer Cycle; Figure 5-1 Transfer Operation Examples - Hitachi LQE550 User Manual

5 PROGRAMMING

5.1 Transfer Cycle

(1) Transfer operation
The CPU link module transfers data to all of the CPUs and LPUs connected to the CPU link
line so as to equalize the contents of their G-registers (G000 to GFFF).
(2) Transfer area and range
With the personal computer, set the number and range of G-register words that are to be
output to the CPU (or LPU). The words of up to 1,024 G-registers (256 words each) can be
transferred from each CPU (or LPU).
A CPU having its transfer area set to zero is set to "reception only." For information on
how to set the number and range of words that each CPU can transfer from its G-registers,
see "4.6 Setting Module Information."
CPUs have their transfer area set to zero by default.
Sample configuration:
CPU1
Set the output data of
CPU1 in area 1
G-register area states:
CPU1
G-register area
Area 1
Area 2
Area 3
• CPU1 transfers area 1 to CPU2 and CPU3.
• CPU2 transfers area 2 to CPU1 and CPU3.
• CPU3 transfers area 3 to CPU1 and CPU2.
Set the output data of
CPU2 in area 2
G-register area

Figure 5-1 Transfer Operation Examples

CPU2
CPU2
Area 1
Area 2
Area 3
5-2
CPU3
Set the output data of
CPU3 in area 3
CPU3
G-register area
Area 1
Area 2
Area 3