Override Operation; Command And Frequency-Control Override Hierarchy - Toshiba H9 ASD Installation And Operation Manual

Any or all of the Command and Frequency control input sources may be placed in the Override
Mode.
Placing the H9 ASD in the Local mode (Local/Remote LED on) via the EOI places the RS485 (2-wire)
control selection in the Override Mode for Command and Frequency input (see the section titled
Override Operation on pg. 38
Command and Frequency (or either) may be enabled/disabled at Program Utilities Prohibition
Local/Remote Key (Command or Frequency) Override.
Communications may be used to place the remaining Command and eligible Frequency control input
sources in the Override Mode. Once placed in the Override Mode this setting is valid until it is
cancelled, the power supply is turned off, or the H9 ASD is reset.

Override Operation

The signal sources of
which input sources are in the Override Mode (active Command or Frequency command present). The
first item detected as having the Override function turned on is the selection that is used for Command or
Frequency control input.
The Override control setting supersedes the setting of the Command mode setting (F003) and the
Frequency mode setting (F004). However, the
register scan returns the condition that none of the listed items have the Override feature turned on or a
discrete input terminal is set to Serial/Local Switch and is activated.

Command and Frequency-Control Override Hierarchy

Table 3 lists the input conditions and the resulting output control source selections for Command and
Frequency control Override operation.
From left to right in
the right.
1
Forced F003/
F004 by I/P
Comm.
Terminal
Board
(Assign to Serial/
Local Switch)
1
0
0
0
0
0
Note: 1 = Override feature is turned on for that control input source; 0 = Override Off; X = Don't Care.
38
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for the proper setting). The Local/Remote control Override feature for
Table 3 are scanned from left to right in the order that they are listed to determine
Table 3, the active signal source has priority over any adjacent active signal sources to
Table 3. Command and Frequency Control Hierarchy.
2 3 4
RS485 RS485
(4-Wire) (2-Wire)
X X X
X X
1
0 X
1
0 0
1
0 0 0
0 0 0
F003 and F004 settings will be used in the event that the
5
Terminal Board
F003/F004
(Binary/BCD Input)
X X
X X
X X
X X
X
1
F003/F004
0
Setting
H9 ASD Installation and Operation Manual
6 Priority Level
Command/
Frequency Mode
F003/F004 Setting
Communication Board
RS485 (4-Wire)
RS485 (2-Wire)
Terminal Board
F003/F004 Setting