ABB AC 800F Engineering Manual page 33

Process Station
I
NITIALIZE
C
OLD START
W
ARM START
R /S
UN TOP
Gross Automation, 1725 South Johnson Road, New Berlin, WI 53146, www.ssacsales.com, 800-349-5827
In the initialization, the FieldController performs a cold start. Any user pro-
gram already present is also deleted. The redundancy is now no longer ac-
tive. The Secondary enters the "No BS" state. A cold start task -is per-
formed once. The task is performed during transition from cold start or cold
start stopped to running state. In a cold start all the variables and working
data of the function blocks are initialized. The initial values of the variables
can be preset individually in the Variables List for each variable. Outputs
from I/O modules are set to the safety values. After the cold start task has
been computed the outputs are rewritten in accordance with the programs.
Both FieldControllers perform a cold start.
Both FieldControllers perform a warm start. The formerly active FieldCon-
troller reverts to Primary. A warm start task is performed once. The warm
start task is performed while the resource is in transition from the warm start
state or warm start stopped to the running state. It is computed before the
cyclic user tasks are started. After a power failure the process station al-
ways performs a warm start when the power returns.
The number of warm starts is counted in a system variable
(xxxx.NoPowerFail), which is reset to zero in the event of a cold start.
The time of the last power fail signal can be read in a further system
variable (xxxx.PowerOffTim).
Both FieldControllers perform the command (Run or Stop). The LED display
at the Primary indicates the current status. In a redundancy toggle, the last
status is retained, irrespective of the RUN/STOP switch position.
ABB FieldController 800
31