120 Machine Manual
The following table shows a brief description of individual machine states:
STATE |
Description |
|---|---|
OFF |
State Type: Final
All power to machine switched off. This state is assumed if there is no response from the machine. This is an optional Final State.
The OFF state may be reached in two ways: first, power to the machine is switched off or second, power is removed as in a power utility failure. In the OFF state, it must be assured that the machine will go at the least to the initial stopped state when power is restored either by switch or restoration of the utility power source. |
STOPPED |
State Type: Final
The machine is powered and stationary. All communications with other systems are functioning (if applicable). |
STARTING |
State Type: Transient
This state allows the machine to be prepared for running 1. This state could include such processes as heating, self-testing, or calibration. |
READY |
State Type: Quiescent
This is a state which indicates that STARTING is complete. This state maintains the machine conditions which were achieved during the STARTING state. |
STANDBY |
State Type: Transient
The machine is running at the relevant set point speed, there is no product being produced.
This state can be reached either in response to a Start Command from READY, or any internal machine logic that would dictate a temporary transition from the PRODUCING state, such as materials run-out.
The status of "materials run-out" could be due to a lack of materials on the machine's own infeed, or a stoppage of downstream equipment. |
PRODUCING |
State Type: Transient
Once the machine is processing materials, it is deemed to be producing. |
STOPPING |
State Type: No Command
This state executes the logic which brings the machine to a controlled and safe stop. |
ABORTING |
State Type: Transient
The ABORTED state can be entered at any time in response to the Abort Command, or on the occurrence of a machine fault. The aborting logic will bring the machine to a rapid, controlled safe stop. Operation of the Emergency Stop, or "E-Stop", will cause the machine to be tripped by its safety system. It will also provide a signal to initiate the ABORTING state. |
ABORTED |
State Type: Quiescent
This state maintains machine status information relevant to the Abort condition. The Stop Command will force transition to the STOPPED state. |
HOLDING |
State Type: Transient
When the machine is in STANDBY or PRODUCING, the Hold Command can be used to start Holding logic, which brings the machine to a controlled stop. |
HELD |
State Type: Quiescent
The Held state would typically be used by the operator to temporarily hold the machine's operation while material blockages are cleared, or to stop throughput while a downstream problem is being resolved. |
An example State transition matrix for Automatic Mode is shown below. Note the State Model does not rigidly specify the internal machine state transition logic, which will vary depending on the application.
|
Machine Status |
Commands |
|||||||||
Initial State |
Power On |
Power Off |
Materials Run-Out |
Materials Ready |
Machine Fault |
State Complete |
Prepare |
Start |
Stop |
Held |
Abort |
Off |
Stopped |
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Stopped |
|
Off |
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Starting |
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Starting |
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Aborting |
Ready |
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Stopping |
|
Aborting |
Ready |
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Aborting |
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Standby |
Stopping |
|
Aborting |
Standby |
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Producing |
|
Aborting |
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Stopping |
Holding |
Aborting |
Producing |
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Standby |
Aborting |
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Stopping |
Holding |
Aborting |
Stopping |
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Aborting |
Stopped |
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Aborting |
Holding |
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Aborting |
Held |
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Aborting |
Held |
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Aborting |
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Standby |
Stopping |
|
Aborting |
Aborting |
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Aborted |
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Aborted |
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Stopped |
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