Mitsubishi Electric Q80BD-J61BT11N, User Manual

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MELSEC
4 FUNCTIONS
(4) Special link relays/registers (SB and SW) related to the standby
master function
The following explains the special link relays and registers related to the standby
master function.
They are stored in the buffer memory.
(a) Special link relays (SB)
The special link relays (SB) relating to the standby master function are as
follows:
The numeric values in parentheses in the number column indicate buffer
memory addresses and bit locations.
Example: When the buffer memory address is 5E0H and the bit location is
0: (5E0H, b0)
Table 4.5 List of special link relays related to the standby master function
Number Name Description
Applicability
( Applicable, Not applicable)
Master
station
Standby master
station
SB0001
(5E0
H
,b1)
Master station
switching and data link
startup
Switches the output information from the standby master station
to the master station, and starts up the data link.
Off : Without switching direction
On : With switching direction
SB0042
(5E4
H
,b2)
Acknowledge status of
master station
switching and data link
startup
Shows the acknowledge status of the data link startup switching
direction from the standby master station to the master station.
Off : Not acknowledged
On : Direction acknowledged
SB0043
(5E4
H
,b3)
Complete status of
master station
switching and data link
startup
Shows the complete status of the data link startup switching
direction from the standby master station to the master station.
Off : Not complete
On : Switching complete
SB0070
(5E7
H
,b0)
Master station
information
Shows the data link status.
Off : Data link control by the master station
On : Data link control by the standby master station
SB0071
(5E7
H
,b1)
Standby master
station information
Indicates whether or not there is a standby master station.
Off : No standby master station
On : Standby master station exists
(b) Special link registers (SW)
The following explains the special link registers (SW) related to the standby
master function.
The numeric values in parentheses in the number column indicate buffer
memory addresses.
Table 4.6 List of special link registers related to the standby master function
Number Name Description
Applicability
( Applicable, Not applicable)
Master
station
Standby master
station
SW0043
(643
H
)
Result of master
station switching and
data link startup
The execution result of the master station switching and data
link startup direction by the SB0001 is stored.
0 : Normal
Other than 0 : An error code is stored.
(Refer to Chapter 15.)
SW0073
(673
H
)
Standby master
station number
Stores the station number of the standby master station.
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