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Softing Linking Device –
Manual for Configuration, Installation and Maintenance
Glossary
V1.31 page 81 of 85
Function Block
Function blocks define the capabilities of the high level
measurement and control available in the device.
There are many possible function block capabilities
contained in a device such as analog input, discrete
input, discrete output, signal characterizer, arithmetic,
integrator, PD or PID control, input selector or analog
output.
Analog Input (AI)
Function Block
Scanned by the Linking Device.
Multiple Analog
Input (MAI)
Function Block
Provides up to 8 variables in one function block,
reducing scan times.
Mode
Target - The mode requested by the operator
Actual - The current mode of the block which may
differ from the target based on the current operating
conditions. The actual mode is calculated during block
execution.
Permitted - The modes allowed by target during
operation
Normal - The desired operating mode of the block.
Mode: Out of
Service
In this mode the algorithm of the block is no longer
being executed and any outstanding alarms will be
cleared. This is the highest priority mode.
Mode: Auto
In this mode the block algorithm is being executed with
new value and status as well as mode being computed
each Macrocycle or execution of the block
Mode: Manual
In this mode the block output is not being calculated
although it may be limited. It is set directly by the
operator through an interface device.
Macrocycle
The period of execution in which the function block
schedule is defined.
Schedule
The rate and relative time which function blocks
process their inputs and generate their outputs. The
schedule defines when a function block is triggered to
start execution
Link Master
A link master device is a device that is capable of
becoming the LAS. There is a bid procedure that is
followed that selects the link master device with the
lowest node address.
Link Active
Schedule Device
The LAS performs five functions:
Maintains the schedule to send compel data (CD)
messages (DLPDU's) to devices on the network. This
is the highest priority function.