User's Manual

UMAC Turbo CPU/Communications Board Hardware Manual
Ethernet Protocol 40
OPTION 16: BATTERY BACKED MEMORY
The contents of the standard memory are not retained through a power-down or reset unless they have
been saved to flash memory first. Option 16A provides supplemental battery-backed RAM for real-time
parameter storage that is ideal for holding machine state parameters in case of an unexpected power-
down.
Memory Options
Item
Specification
Pmac Locations
Turbo Option 16A
32K x 24 SRAM
X/Y:$50000 to $53FFF
Turbo Option 16B (obsolete)
128K x 24 SRAM
X/Y:$50000 to $5FFFF
PMAC firmware allows the user to store the information in the locations provided by the additional
memory without issuing a save command. Users will typically access battery backed memory using
standard M-variable definitions. Another feature of the Turbo firmware allows the user to automatically
save the information that resides in the P-variables and Q-variables to the battery backed memory by
setting I46 to the appropriate value. The table below defines how the firmware allocates the memory
based on the setting of I46.
Option 16 Memory Allocations
I46
Option 16A
Notes
0
X/Y $50000 to $53FFF
Default – General purpose
1
L:$50000 to $51FFF
P-variables 0-8191 saved
X/Y:52000 to $53FFF -open
2
L:$52000 to $53FFF
Q-variables 0-8191 saved
X/Y:50000 to $51FFF -open
3
L:$50000 to $51FFF
L:$52000 to $53FFF
P-variables 0-8191 saved
Q-variables 0-8191 saved
Note: P and Q variables are saved as floating point double words (L:$xxxxxx).
The battery used for the Option 16 memory is an ElectroChem QTC85 series lithium battery part number
3B880. The typical life expectancy of the battery for the Option 16 battery backed memory is 5 years but
Delta Tau Data Systems, Inc. recommends that the user change the battery every one or two years as part
of the standard maintenance of the machine.
Safety and Handling of Lithium Batteries
Before opening any single-packaged batteries sent to your facility, it is critical that you review this
procedure in full.
The proper handling procedure for Delta Tau part number 100-OQTC85-000 must be followed to avoid
mishandling and possible exposure of employees to dangerous situations. The Electrochem/Great Batch
Manufacturing part number for the battery is 3B880PC-QTC85.