Mitsubishi Electric L26CPU-BT User Manual page 157

(e) When forcibly switching the data link control right from the standby master station
to the master station
The areas enclosed by the broken and dotted lines in the program example shown in (d) must be modified as
shown below.
Control program when the master station is operating
Control program when the standby master operation is operating
(local station operation)
CHAPTER 8 FUNCTIONS
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8