On/Off Timings Of Link Special Relays (Sb) Relating To Standby Master Function - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
16 External PLC link
16.1 CC-Link
16.1.4.4 ON/OFF Timings of Link Special Relays (SB) Relating to Standby Master
Function
The following shows the ON/OF timings of the link special relays (SB) relating to the standby master function.
SB70
(Master station information)
SB7B
(Host master/standby master operation status)
SB5A
(Master switching request acknowledgement)
SB5B
(Master switching request complete)
SB01 (User operation)
(Refresh instruction at standby master switching)
SB42
(Refresh instruction acknowledgement status at
standby master switching)
SB43
(Refresh instruction complete status at standby
master switching)
(*1) When SB5B is turned ON, the sequence program switches RX to RY and RWr to RWw.
In addition, SB01 is turned ON by the sequence program. (Enclosed with dotted lines in the figure.)
(a) to (d) in the diagram correspond to those in "Program Example When Using Standby Master (Master Station Duplex)
Function" in "16.1.4.5 Program Example When Using Standby Master (Master Station Duplex) Function".
IB-1501668-B
ON
OFF
ON
OFF
ON (a)
OFF
OFF
OFF
OFF
OFF
932
ON (b)
(*1)
ON (c)
ON
ON (d)