ABB 800xA Operation page 166

S100 Warmstart
holding its initial command. A period of time is allowed for each S100 board to log
into the system. As each board is recognized, its outputs are read. If configured for
warmstart, the corresponding CCF loop output FCM for each output channel on the
board is placed in the MANUAL mode and its result is synchronized with the field
output value in the board memory. The action taken by a device loop configured for
warmstart depends on whether there are inputs to the device. If there are inputs to
the device, the DEV_CMND parameter is adjusted to command the device to
assume the existing field state. If there are no inputs, the DEV_CMND parameter is
set to the INIT_CMND (NO COMMAND). Finally, the automatic transfer of
outputs to the S100 board is enabled.
Actions On Board Communication
As a board logs out, a diagnostic message Block nnnn has logged out is sent and
the associated data quality goes BAD. As a result, FCMs may take their configured
action on output error and the automatic transfer of outputs to the board is
disabled. As a board logs in, output values are read from the board. If configured for
warmstart, the corresponding CCF output FCM or device loop for each channel on
the board is warm started. That is, the output FCM is placed in the MANUAL mode,
and the output value from the board is written to its result attribute. For the warm
started device loop, its DEV_CMND attribute is set to NO COMMAND. Finally,
the automatic transfer of outputs to the S100 board is enabled.
Actions On Loop Download
When a loop with an output FCM configured for warmstart is downloaded, the
output mode of the FCM is placed in the MANUAL mode and the output value from
the board is written to its result attribute. When a device loop configured for
warmstart is downloaded, its DEV_CMND attribute is set to NO COMMAND.
Runtime Display Support
During runtime, but not at startup, as boards log in, diagnostic messages are sent to
the diagnostic archive. On the S100 I/O Display, there is a display target for a CCF
tag associated with each channel. On this display, the tags for CCF loops with
output FCMs and device loops configured for warmstart that were warm started are
shown with a white background. Note that the loop warm started for a given channel
is the loop whose tag is shown in the S100 I/O Display. If two or more loops
166
Section 7 I/O Displays
3BUR002418-600 A