Toshiba P9 - Override Operation

40 P9 ASD Installation and Operation Manual
Placing the P9 ASD in the Hand mode (Hand/Auto 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 for the proper setting). The Hand/Auto control Override feature for Command
and Frequency (or either) may be enabled/disabled at Program Utilities Prohibition Hand/
Auto 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 P9 ASD is reset.
Override Operation
The signal sources of Table 4 are scanned from left to right in the order that they are listed to determine
which input sources are in the Override Mode (active Command or Frequency command signal 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 F003 and F004 settings will be used in the event that 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 Hand Priority and is activated.
Command and Frequency-Control Override Hierarchy
Table 4 lists the input conditions and the resulting output control source selections for Command and
Frequency control Override operation.
The P9 ASD software reads the listed control sources from the left to the right as listed in Table 4.
The first item to be read that has the Override feature turned on will be used for Command or Frequency
control.
Table 4. Command and Frequency Control Hierarchy.
1 2 3 4 5 6 Priority Level
Forced F003/
F004 by I/P
Terminal
(Assign to Hand
Priority)
Comm.
Board
RS485
(4-Wire)
RS485
(2-Wire)
Terminal Board
(Binary/BCD Input)
F003/F004
Command/
Frequency Mode
1 X X X X X F003/F004 Setting
0 1 X X X X Communication Board
0 0 1 X X X RS485 (4-Wire)
0 0 0 1 X X RS485 (2-Wire)
0 0 0 0 1 X Terminal Board
0 0 0 0 0
F003/F004
Setting
F003/F004 Setting
Note: 1 = Override feature is turned on for that control input source; 0 = Override Off; X = Don’t Care.