Pvg Valve Power Supply; Eeprom Write/Erase; Ratings; Vault Memory - Danfoss PLUS+1 Series Technical Information

Technical Information
Product Ratings

EEPROM Write/Erase

24
PLUS+1® Controller Family

PVG Valve Power Supply

DOUT/PVGpwr pins can provide the battery supply voltage required by Danfoss PVG valve electronics for
those control strategies requiring application software control of the valve power source.
When enabled, the DOUT/PVGpwr pin passes battery (reference) voltage to the PVG valve electronics.
One DOUT/PVGpwr pin can power up to 3 PVG valves. Refer to individual module API documents for PVG
power pin characteristics.

Ratings

To prevent unexpected memory writes, care must be taken to ensure memory with a high number of
read/write cycles is either U32 or S32 data types.
Specifications
Description
EEPROM write/erase cycles (all modules except
IX012-010, IX024-010)
EEPROM write/erase cycles (IX012-010,
IX024-010)
FRAM write/erase cycles(all extended memory
modules-MC0XX-XX8)
EEPROM used in PLUS+1 controllers is rated for 1million read/write cycles per sector. Sector size is 32 bits.
When a value is written to EEPROM, all 32 bits in a particular sector are always written, regardless of the
size of the size of the saved value. If the value being saved in a sector is less than 32 bits (such as. U8, S16,
BOLL, etc) adjacent bits in the same EEPROM sector are rewritten with their previous value. The
implication of this memory property is that if two values are being written to the same memory sector,
the useful life of the sector is determined by the value being written most frequently. If that value
exceeds 1 million read/write cycles, all values in the sector may be compromised if the useful life is
exceeded.

Vault Memory

Some variants of PLUS+1 modules have 2 MByte of serial flash vault memory (also referred to as
application logging memory).
Application developers can use this memory to log machine event data and use the PLUS+1 Service Tool
to extract the logged data. As there is no real time clock on PLUS+1 modules, vault memory is not time
stamped.

FRAM Memory

Any of the PLUS+1 extended memory controllers use FRAM memory. FRAM has a write endurance of over
100 trillion cycles. This increased write endurance is particularly ideal for datalogging.
Accessing non-volatile or application log memory can delay the service tool scan.
520L0719 • Rev PB • Feb 2014
Minimum Maximum Comment
1 million Minimum valid over entire operating
temperature range.
10,000 Minimum valid over entire operating
temperature range.
100 trillion Minimum valid over entire operating
temperature range.