A.O. Smith 3400 - Manual (Page 57)

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FIGURE 68. PROGRAMMABLE ANNUNCIATION CONT.
DIAGNOSTICS BUTTON
The Diagnostics button displays analog and digital I/O status
of the Burner Control and is meant only for diagnostics and
troubleshooting purposes. A snapshot of the diagnostic status
is displayed and updated once per second as it changes in the
control.
The digital I/O data is displayed as LEDs that are either on
(green) or off (gray) (See Figure 69). Not all digital I/O can be
displayed at the same time on the page, so a horizontal scroll bar
is used to move the view left and right to show all digital I/O data.
The control analog I/O can also be viewed on the OI Display. A
snapshot of the diagnostic status is displayed and updated as it
changes in the control.
The analog I/O data is displayed as bar charts with I/O level
represented in the I/O range (see Figure 70) Analog I/O that is
not enabled for the installation displays a blank I/O level. Not all
analog I/O can be displayed at the same time on the page, so
a horizontal scroll bar is used to move the view left and right to
show all analog I/O status.
SYSTEM CONFIGURATION (S7999D OI DISPLAY ONLY)
The OI Display has some functions related to general
configuration for the control in the end user installation. Pressing
the Display Refresh button invokes a search procedure (see
Figure 71). A new R7910A Hydronic Control or R7911 Steam
Control is identified by “Unknown” status next to its name in
the boiler system list (see Figure 72 on Page 58). “Unknown”
indicates that configuration data has not been retrieved from the
control yet.
The control connected to the Modbus network is indicated to the
user after the search procedure has concluded.
Once the control is located it must be synchronized with the OI
Display before it can be displayed. New controls are not displayed
on the Home page until this synchronization is performed.
FIGURE 69. DIAGNOSTICS PAGE (DIGITAL I/O)
FIGURE 70. DIAGNOSTIC PAGE (ANALOG I/O)
FIGURE 71. SYSTEM REFRESH