Mitsubishi Electric MELSEC SW1DNC-CCIEF-B User Manual page 183

■Details of the special relay and special registers to be monitored when estimating the
occurrence of path switching
No. Name
SM1600 Other system error flag
SD1590 No. of module for which
system switching request
is issued from the network
module in own system
SD1690 No. of module for which
system switching request
is issued from the network
module in another system
Description Description details
OFF: No error • Turns ON when an error occurs by redundant system error check. (Turns ON when
ON: Error any of bits for SD1600 turns ON.)
• Remains OFF when no errors are present.
No. of module for which • Any of the following bits turns ON corresponding to the No. of the module for which
system switching request system switching request is issued from the network module in own system.
is issued from the network • Turned OFF by the system after the error of the relevant module is resolved by the
module in own system user.
SD1590
• For No. of module for which system switching request is issued from the network
module in another system, refer to SD1690.
No. of module for which • Any of the following bits turns ON corresponding to the No. of the module for which
system switching request system switching request is issued from the network module in another system.
is issued from the network • Turned OFF by the system after the error of the relevant module is resolved by the
module in another system user.
SD1690
• For No. of module for which system switching request is issued from the network
module in own system, refer to SD1590.
Appendix 1 Precautions for Accessing Redundant CPU System
Each bit
b15 b11 b1 b0
to
0 0/1 0/1 0
Module No.0 :
Module No.1 :
Module No.11:
Each bit
b15 b11 b1 b0
to
0
0/1 0/1 0
Module No.0 :
Module No.1 :
Module No.11:
0 : OFF
1 : ON
Disabled since a CPU
module uses two slots.
Module to the right of a
to CPU module
Rightmost module on
12-slot base unit (Q312B)
0 : OFF
1 : ON
Disabled since a CPU
module uses two slots.
Module to the right of a
to
CPU module
Rightmost module on
12-slot base unit (Q312B)
APPX
A
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