ABB Symphony Harmony Series, Instruction, Page: 194 / 402

Function Codes
WBPEEUI240751C0 6 - 15
3. The auto-bypass/manual override operation of the IISAC01 Analog Con-
trol Station takes precedence over the CIO block’s simulation, override, normal,
and undefined source modes.
Hnet Stall Mode (Default State)
A default state on stall specification in output channel func-
tion codes selects a failure mode output. An output channel
will go to the configured default state when Hnet communica-
tion or communication with the Harmony controller is lost. For
an analog output, the options are zero percent output, 100
percent output, and hold current output. For a digital output,
the options are zero state output, one state output, and hold
current output. An output will automatically return to normal
(i.e., controlled output) after communication is reestablished.
Refer to
Failure Mode (Outputs) Failure Mode (Outputs) Failure Mode (Outputs) Failure Mode (Outputs) in Section 3 for further
explanation.
Status Reporting
A status error inhibit specification in I/O channel function
codes controls error status reporting. If status reporting is dis-
abled, any channel errors will not be reflected in I/O block
device status reports. Block device status reports are inte-
grated into Harmony controller status reports. This permits
disabling status reporting during testing and for an out of ser-
vice point. It does not disable input or output value and alarm
status reporting, however.
NOTE: The override, simulation, and status error inhibit permit specification
(S26) in the I/O device definition function code acts as the master switch for
enabling or disabling status error inhibiting for individual channels.
Alarming
Alarm status reports are used to trigger alarming features
such as display changes (e.g., colors and dynamic symbols),
alarm tones, external annunciators, and automatic logging
features. System alarming starts at the controller and I/O
block level. When an I/O channel function code reports an
analog value or digital state, it also includes alarm status
information.
Low and high alarm limit specifications in analog I/O channel
function codes are used to set up alarming. A low alarm condi-
tion will be reported when an input value or output readback