Refresh Times/Response Times; Power On/Program Start; Power Cuts Or Drops (Battery) - ABB 07CR41 Operating Manual

1.3.4

Refresh times/response times

1.3.5

Power on/program start

1.3.6

Power cuts or drops (battery)

Advant Controller AC 31 / Issued: 01.99
Bus refresh times and basic unit response times depend on the system configuration, the
number and type of the remote units on the CS31 bus.
Bus refresh times
The bus refresh times correspond to the transmission time over the bus. The calculation corre-
sponds to the addition of all the communication times of the remote units on the bus and the
base time of the master basic unit.
Basic unit response times
The basic unit response time corresponds to the time taken to activate an output after the acti-
vation of an input.
The maximum response time is obtained by adding the delay time for the output, the bus re-
fresh time and twice the cycle time.
The delay time for the input on the 40 and 50 series is 5 ms.
The response time for a transistor output is considered as 0 ms, the response time for a relay
output is 6 ms.
The cycle time defines the time intervals after which the processor starts the execution of the
user program again.
The cycle time has to be specified by the user. It must be greater than the program processing
time of the user program, the data transmission times and the related waiting times.
The cycle time is also the time base for some time-driven functions such as the PI regulator.
Comment:
The calculation of the cycle time and the communication times between the basic unit and the
input/output units for calculating the bus transmission times is found in chapter 5.4 in the table
"Bus reaction times".
The basic unit executes a complete series of auto tests at each startup. The program can only
be started if no errors have been detected.
The auto tests verify the following:
- the program syntax,
- the data transmission,
- the status of the extensions,
- the status of the remote units, if the basic unit is configured as master.
- the startup conditions (internal memories are reset or not – depending on the configuration
by the user).
The basic unit initialization depends on the startup type: see chapter 5.3
The bus system is also initialized after startup if the basic unit is the master on the CS31 sys-
tem bus.
The 50 series basic unit features built-in battery backup in order to save the necessary infor-
mation for the next startup in the event of a power drop or cut.
The backup battery is a standard Vanadium-Lithium cell which the user can change himself.
Battery backup is effective up to 20 days at 25 °C. During this period data (e. g. flags) can be
saved although power to the device is down.
The cell is fully charged after 12 hours of continuous device operation. Its lifetme may vary
from 6 to 15 years, depending on how often and for how long power supply to the device is off.
Caution:
Observe the following operational guidelines:
1 – 7 Introduction
3