7
PROGRAMMING CAUTIONS
7.4 Precautions at System Switching Occurrence
7 - 19
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR
STARTING UP A
REDUNDANT SYSTEM
5
REDUNDANT SYSTEM
FUNCTIONS
6
REDUNDANT SYSTEM
NETWORKS
7
PROGRAMMING
CAUTIONS
8
TROUBLESHOOTING
When outputting the command output (e.g., output (Y), start-up by writing to buffer
memory, clear etc.), consider time required for transferring conditions to the standby
system CPU module from the control system CPU module.
Diagrams 7.18 and 7.19 show a program example which delays the output by one
scan from the command output condition establishment.
(a) Input is returned corresponding to output
[Program example]
(Before measures)
(After measures)
Diagram 7.17 Program Example when there is Response (Input) to Output
Response (input) (X10)
Output (Y10)
M0
SET Y10
X10 Y10
M10
RST Y10
X10 Y10
Delays SET Y10 by one
scan from PLS M1.
Delays RST Y10 by one
scan from PLS M11.
M1
SET Y10
M0
PLS M1
X10 Y10
M11
RST Y10
M10
PLS M11
X10 Y10
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