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SEMI E54.3-0698 © SEMI 1998, 2004 19 8.8.1.3 Initial and Def ault Values Table 27 Actuator-AO-MF Object At tribute Initial and Default Values Attribute Initial Value Default Value Comment Valve Type Default Value Manufac…

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SEMI E54.3-0698 © SEMI 1998, 2004 18
8.7 Sensor-AI-Aux Object — The Sensor-AI-Aux object is an Auxiliary Input object instance which inherits
attributes, services, and behavior from the Sensor-AI object as defined in SEMI E54.1. The Sensor-AI-Aux object
instance is the device component responsible for retrieving a reading from a physical analog input and making the
value available to the network.
8.7.1 Sensor-AI-Aux Object Attributes — The attributes provided by the Sensor-AI-Aux object instance are defined
in SEMI E54.1. The value attribute represents the analog input measurement.
8.7.2 Sensor-AI-Aux Object Services — The services provided by the Sensor-AI object instance are defined in
SEMI E54.1.
8.7.3 Sensor-AI-Aux Object Behavior — The behavior exhibited by the Sensor-AI-Aux object instance is defined in
SEMI E54.1. Additional specific behavior associated with the Sensor-AI-Aux object is defined below.
8.7.3.1 Sensor-AI-Aux OPERATING Application Process — A reading is retrieved from a physical analog input.
This reading may be corrected with a manufacturer-specified algorithm. This corrected reading becomes the input to
the offset and gain formula to generate the value attribute as referenced in SEMI E54.1.
8.8 Actuator-AO-MF Object — The Actuator-AO-MF object instance inherits from the Actuator-AO object
attributes, services, and behavior as defined in SEMI E54.1. The Actuator-AO-MF object instance is the component
responsible for driving the physical mass flow control valve of the device. Override attributes are available to
produce valve drives which either fully close or fully open the valve, irrespective of the value of the setting attribute.
8.8.1 Actuator-AO-MF Object Attributes
Table 26 Actuator-AO-MF Object Attributes
Attribute Name
Attribute
Identifier
Access Network
Required
Form
Valve Type A1 R No Enumerated Byte
Override A2 RW No Enumerated Byte
Reserved A3–A64 — — Reserved for future expansion.
Manufacturer-Specified > A64 — — Manufacturer-Specific attributes.
8.8.1.1 Valve Type (Optional) — An attribute which specifies the type of valve present in the device. This attribute
is an enumerated byte that can take on one of the following values:
0 = Solenoid
1 = Voice Coil
2 = Piezo Electric
3 = Thermal
4–63 = Reserved
64–255 = Manufacturer-Specified
8.8.1.2 Override (Optional) — An attribute which specifies an override to the controlled valve position derived
from the Controller object instance. This attribute is an enumerated byte that can take on one of the following
values:
0 = Normal — Normal control mode
1 = Flow Off — Valve Closed
2 = Purge — Valve Open
3 = Power Off — Valve to unpowered state
4–63 = Reserved
64–255 = Manufacturer-Specified
SEMI E54.3-0698 © SEMI 1998, 2004 19
8.8.1.3 Initial and Default Values
Table 27 Actuator-AO-MF Object Attribute Initial and Default Values
Attribute Initial Value Default Value Comment
Valve Type Default Value Manufacturer-Specific
Override LVV Normal
8.8.2 Actuator-AO-MF Object Services — There are no additional services defined for this object in this document.
8.8.3 Actuator-AO-MF Object Behavior — The behavior exhibited by the Actuator-AO-MF object instance is
defined in SEMI E54.1. The specific behavior associated with the Actuator-AO-MF object is defined below.
8.8.3.1 Actuator-AO-MF OPERATING Application Process–Override — The override attribute determines whether
the position of the physical flow control valve will be overridden and, if so, to what position it will be driven.
Otherwise, the physical flow control valve is driven by the converted signal derived from the Controller object
instance.
8.9 Controller Object — The Controller object definition is provided in SEMI E54.1. This object instance is the
device component which provides the closed-loop control of mass flow. There are no additional attributes, services,
or behavior defined for this object in this document.
8.9.1 Controller Object Attributes — The following attribute table is provided to enhance the C Class Attribute
table and provides a specific attribute “Form” definition.
Table 28 C Class Attributes
Attribute Name
Attribute
Identifier
Access Network
Required
Form
Alarm Settling Time CA21 RW N Real
Warning Settling Time CA24 RW N Real
8.10 Local Link Object — The Local Link object is defined in SEMI E54.1. This object instance is the device
component which provides a mechanism of linking two attributes within the device. There are no additional
attributes, services, or behavior defined for this object in this document.
8.11 SISO Object — The SISO object provides a Single Input, Single Output function. At this level, only the input
and output attributes are defined. An instance of this object makes no sense, because there is no transfer function
defined, but rather, the attributes, services, and behavior of this object are inherited by the next level down (e.g.,
SISO-Setpoint Object).
8.11.1 SISO Object Attributes
Table 29 SISO Function Object Attributes
Attribute Name
Attribute
Identifier
Access Network
Required
Form
Input A1 RW Yes Data Type
Output A2 R Yes Data Type
Data Type A3 R No USINT
Reserved A4–A32
— —
For future revisions to this object.
Reserved A33–A64 For next level object.
Manufacturer-Specified > A64
— —
For manufacturer specification.
8.11.1.1 Input — An attribute which specifies the input value, or independent variable, for the transfer function.
The data type is specified by the data type attribute.
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8.11.1.2 Output — An attribute whose value is the output, or dependent variable, of the transfer function. The data
type is specified by the data type attribute.
8.11.1.3 Data Type — An attribute which specifies the data type of the input attribute and the output attribute. The
format and values of this attribute are defined in SEMI E54.1.
8.11.1.4 Initial and Default Values
Table 30 Table 30 SISO Object Attribute Initial and Default Values
Attribute Initial Value Default Value Comment
Input LVV 0
Output LVV manufacturer-specified
Data Type LVV manufacturer-specified
8.11.2 SISO Object Behavior — The only behavior defined at this level is that of a continuously operating transfer
function: The Output attribute value is calculated as a function of the Input attribute value. The specific transfer
function is defined by lower level objects which inherit from this object.
Output = F(Input)
where: F is the function specified
8.12 SISO-Setpoint Object — The SISO-Setpoint Object inherits from the SISO object. The definitions added by
the SISO-Setpoint object include the behavior associated with the transfer function.
8.12.1 SISO-Setpoint Object Attributes
Table 31 SISO-Setpoint Object Attributes
Attribute Name
Attribute
Identifier
Access Network
Required
Form
Ramp Type A33 RW No USINT
Ramp Rate A34 RW No Data Type
Ratio A35 RW No REAL
Reserved A36–A64 — — Reserved for future expansion.
8.12.1.1 Ramp Type (Optional) — An attribute which specifies a mechanism by which the output attribute is
ramped to the current value of the input attribute.
0 = Disable
1 = Time in seconds
2 = Amount per second
3–63 = Reserved
64–255 = Manufacturer-specified
8.12.1.2 Ramp Rate (Optional) — An attribute specified to define the ramp rate at which the SISO-Setpoint object
instance tracks towards the current input value. The ramp rate specifies how quickly the output is ramped from the
previous output value to the current input value. This attribute is expressed in terms of seconds or amount of change
per second.
8.12.1.3 Ratio (Optional) — An attribute which specifies the ratio multiplier to be applied to the input attribute
value prior to the application of the ramp transfer function.