App - 6 App - 6
MELSEC
APPENDIX
POINT
Route switching is not executed if a communication error has already occurred at
a communication start*
1
for the Redundant CPU specified for the Logical Sta. No.
(A communication error occurs.)
If a communication error has occurred, refer to (b) in (4) Automatic switching of
communication route, and remove the communication disturbance.
*1: First communication after execution of the mdOpen function in the MELSEC
data link library (communication using the mdReceive, mdSend, mdControl,
mdDevRst, mdDevSet, mdRandR, mdRandW or mdTypeRead function).
If other station access (including the programmable controller CPU other than the
Redundant CPU) is made to nine or more stations simultaneously, automatic
switching of communication route may not be executed.
REMARK
The following indicates details of the special relay and special registers to be
monitored when estimating whether route switching occurred or not.
Number Name Meaning
Explanation
SM1600
Other system
error flag
OFF: No error
ON: Error
Turns on when an error occurs during redundant system error
check. (Turns on when either of bits for SD1600.)
Remains off when no errors are present.
SD1590
Module No. for
network module
requesting route
switching in host
system
Module No. for
network module
requesting route
switching in host
system
Any of the following bits turns on corresponding to module No. for
network module requesting route switching in host system.
Turns off by the system after recovery from error of the relevant
module by user.
b1 b0
b15
b11
to
to
to
0
0/1
0
0/1
SD1690
0: OFF
1: ON
Bit status
Module No. 0: Invalid, as CPU module
uses 2 slots.
Module No. 1: Indicates the module to
the right of CPU module
Module No.11: Indicates the module at
the right end of a 12-I/O
slot base (Q312B)
Refer to SD1690 for module No. for network module requesting
route switching in other system.
SD1690
Module No. for
network module
requesting route
switching in other
system
Module No. for
network module
requesting route
switching in other
system
Any of the following bits turns on corresponding to module No. for
network module requesting route switching in other system.
Turns off by the system after recovery from error of the relevant
module by user.
b1 b0
b15
b11
to
to
to
0
0/1
0
0/1
SD1690
0: OFF
1: ON
Bit status
Module No. 0: Invalid, as CPU module
uses 2 slots.
Module No. 1: Indicates the module to
the right of CPU module
Module No.11: Indicates the module at
the right end of a 12-I/O
slot base (Q312B)
Refer to SD1590 for module No. for network module requesting
route switching in host system.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
Page 223: ......
