Switching Between Scan Execution And Low Speed Execution Types - Mitsubishi Q00JCPU User Manual

10
DEVICE EXPLANATION

10.6.3 Switching between scan execution and low speed execution types

Basic
Note10.17
The CPU module saves (protects) and restores the index register (Z0 to 15) contents
Redundant
when switching between a scan execution type program and a low speed execution type
program.
Note10.17
(1) When switching from a scan execution type program to a low speed
Universal
UD
Note10.17
(2) When switching from a low speed execution program to a scan
Execution program
Index register value
For scan execution
Index
type programs
register
storage
For low speed
area
execution type
program
Figure 10.60 Saving and restoration of index register value at switching between scan and low speed execution type programs
(3) Exchanges of index register
Note18
The Basic model QCPU, Redundant CPU and Universal model QCPU cannot use low speed
Basic Redundant
Universal
execution type programs. When the Basic model QCPU, Redundant CPU or Universal model
UD
QCPU is used, it is not necessary to be conscious of the description in this section.
Note10.17 Note10.17 Note10.17
execution type program occurs.
The CPU module saves the index register value of the scan execution type program
and restores the index register value of the low speed execution type program.
execution type program occurs.
The CPU module saves the index register value of the low speed execution type
program and restores the index register value of the scan execution type program.
Switching
Scan execution Low speed
type program execution type
program
Z0=1 Z0=0 to Z0=3
Saved Reset
Z0=0 Z0=1
Z0=0 Z0=0
Word devices should be used for exchanges of index register data between scan
execution type programs and low speed execution type programs.
10.6 Index Register(Z) / Standard Device Resister(Z)
10.6.3 Switching between scan execution and low speed execution types
Switching
Scan execution
type program
1 Z0=1 to Z0=6
Saved Reset Saved
Z0=1 Z0=1 Z0=1
Z0=0 Z0=3 Z0=3
1: For low-speed execution type program, Z0 is changed to 3.
2: For scan execution type program, Z0 is changed to 6.
dataNote18
Switching
Low speed
execution type
program
2 Z0=3
Reset
Z0=6 Z0=6
Z0=3 Z0=3
10
- 64
9
10
11
12