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CHAPTER 8 FUNCTIONS
8
8.8 Submaster Function
8.8.5 Switch from the master station to the submaster station
(a) Sample program of a manual switch
• Devices used in the program
• Program example
(3) Precautions when the control is switched
(a) During a parameter error
While a parameter error is occurring in the master station or submaster station, the submaster station does not
change to the master operating station even if the master station is disconnected. (Data link cannot be
performed because all the stations become faulty.)
(b) During a CPU module stop error in the master station
While a CPU module stop error is occurring in the master station, the submaster station does not operate as a
master operating station even if the submaster station is connected. (Data link is not started.)
(c) If a submaster station starts to operate as a master operating station while cyclic
transmission is stopped
If a submaster station starts to operate as a master operating station after cyclic transmission is stopped in the
master station (during master operation), data link with the master station cannot be restarted in the submaster
station. Restart data link in the master station.
Device Description Device Description
SB0019 Forced master switch command SB00A1 Baton pass status (master station 1)
SB004E
Own station master/submaster function
operation status
SB00B1 Data link status (master station 1)
SB0066 Forced master switch enable status SW005C
Forced master switch command
result
SB0067
Forced master switch acceptance
status
M2 Pulse the switch command
SB0068 Forced master switch operation status M10 Switch command
SB0070 Master station information -
Process upon completion
Process upon abnormal end
Pulse the switch command.
Switch direction
Process upon completion of the switch
Process upon abnormal end of the switch
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