Transmission/Reception Range Of A Slave Central Unit; Data Initialization And Backup - ABB AC 31 Technical Manual

ABB Control - AC 31
1SBC 260400 R1001-b 06.99
Programming

4.1.2. Transmission/reception range of a slave central unit

These parameters only act on the 50 series central units if it is configured as a slave .
The exchange of information between master and slave central units is not only limited to the
exchange of the physical input/output variables. It is in fact possible to exchange a data table:
- On transmission and on reception
- Binary (bits) or analog (words)
- With the size defined, on the slave central unit, in the "CS 31 bus communication:
transmitting and receiving area" configuration parameters
The size of the transmission table (x) may differ from the size of the reception table (y):
- The exchange of bits is effectuated by packets of 8 bits from 2 x 8 bits up to 15 x 8 bits.
- The exchange of words is comprised of between 1 and 8 words.
However, the reception data types (bits or words) should be the same as the transmission data
type:
Default values
It is possible to have:
It is not permitted to have
A change in these parameters is taken into account immediately.

4.1.3. Data initialization and backup

The variables are all initialized by default at each program launch.
It is, however, possible to save the totality or a part of the data on the 50 series central units.
An external battery is not necessary as the 50 series central units possess an incorporated
battery (accumulator Vanadium-lithium), which enables saving the data, with an autonomy of
20 days at 25°C, the battery recharges 0 up to 100% in 12 hours when the power supply is on.
A battery failure is detected with the bit 3 of the status word IW 62.15. If the value of IW 62.15
is such that the bit 3 is set to 0 (xxxx xxxx xxxx 0xxx) when the battery is failed.
The life time depends on the use of the CPU.
A normal case:
- the power supply is OFF every night
- the power supply is OFF every week-end and day-off
- the worst case power supply is every week for 4 days
Data backup is possible by modifying the n value of the following tables.
The 40 series does not have a battery incorporated and doesn't allow data backups.
Transmission data types
32 bits
x bits
x words
x bits
x words
Reception data types
32 bits
y bits
y words
y words
y bits
life time = 15 years
life time = 12 years
life time = 6 years
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