5
REDUNDANT SYSTEM FUNCTIONS
5.7 Memory Copy From Control System To Standby System
5 - 112
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR
STARTING UP A
REDUNDANT SYSTEM
5
REDUNDANT SYSTEM
FUNCTIONS
6
REDUNDANT SYSTEM
NETWORKS
7
PROGRAMMING
CAUTIONS
8
TROUBLESHOOTING
(b) Special Relays and Special Registers for Memory Copy
Table5.58 shows the special relays and special registers for the memory copy
function.
* 1: If one of the followings occurs during memory copy from control system to standby system, the
memory copy will be stopped.
In this case, the "Memory copy to other system status" flag (SM1596) turns off and the "Memory
copy to other system completion" flag (SM1597) turns on.
•Standby system power OFF
•Standby system CPU module reset
•Tracking cable disconnection or malfunction
Table5.58 Special Relays and Special Registers for Memory Copy
Type Number Description
Set by User
or System
Remarks
Special
Relays
SM1595
Turn on this relay to start memory copy after storing
3D1H into SD1595.
User
Specific to control
system CPU module
SM1596
This relay turns on during memory copy.
This relay turns off after memory copy.
*1
System
Applicable to both
control system and
standby system CPU
modules
SM1597
This relay turns on after memory copy.
*1
Turn off this relay when starting memory copy.
In the case of memory copy by GX Developer, GX
Developer will turn off this relay before starting memory
copy.
System /
User
Applicable to both
control system and
standby system CPU
modules
SM1598
Turn on this relay when not copying memory from
standard ROM.
Default: Off (Execution of standard ROM memory copy)
User
Specific to control
system CPU module
Special
Registers
SD952
Stores the status upon completion of memory copy.
(Stores the same value as SD1596.)
Backed up for a power failure, this register is not
initialized when power is switched off and then on or the
RESET/L.CLR switch is moved to the reset position and
then to the neutral position.
It is initialized by latch clear operation.
System
Applicable to both
control system and
standby system CPU
modules
SD1595
Store 3D1H (standby system CPU module I/O No.) into
this relay before turning on SM1595
User
Specific to control
system CPU module
SD1596
This relay stores the status upon completion of memory
copy. (0: Completion)
System.
Applicable to control
system and standby
system CPU modules
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