66 GX9 ASD Installation and Operation Manual
Command Mode and Frequency Mode
Control
Command control includes instructions such as Stop, Run, Jog, etc. The source of the Command
signal must be established for normal operation.
Frequency commands control the output speed of the ASD. The source of the frequency control signal
must be established for normal operation.
The source of the command control and speed control may be either internal or external. Once the
source signal is selected for either function, the system may be configured to use the selected signal all
of the time or switch to another source under user-defined conditions.
Command and Frequency control may be carried out using any one of several control methods (signal
sources) or combinations thereof. In the event that multiple control commands are received
simultaneously, the signal sources are assigned priority levels. Typically, the control method for
Command and Frequency control uses the settings of F003 and F004, respectively.
Command Control (F003)
The Command Mode selection of F003 establishes the primary source of the command input for the
ASD. However, the Override feature may supersede the F003 setting as indicated in Table 6 on
page 68.
Table 6 shows the hierarchy of the control sources managed by the Override function. The level of the
control item on the hierarchy is listed from left to right, most to least, respectively. As indicated in the
table, the F003 setting may be overridden by any of the other input sources.
Placing the EOI in the Local mode selects either RS232/RS485 or TTL as the Command Mode
control source. Once in the Local mode, the EOI Port Address (Program Communications
Communications Settings EOI Port Address) setting determines if RS232/RS485 or TTL will be
used for Command control. Local mode operation may be superseded by Communications activity.
Example: With the EOI set to Local and the EOI Port Address set to TTL, an input signal received
from the Communication Card or RS232/RS485 will supersede any received TTL command.
The remaining control sources may be placed into the override mode using communications.
The source of the Command control signal may be selected by:
•The F003 setting,
• Placing an item from the list below in the Override mode via communications, or
• Placing the EOI in the Local mode (places only the RS232/RS485 or the TTL in the Override
mode).
Possible Command signal source selections include the following:
• Terminal Board (default),
• CN8 Option,
• Common Serial (TTL),
• RS232/RS485,
• Communication Card, or
• F003 setting (is used if no signal sources are in the Override mode).
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