Function Blocks General - Endress+Hauser iTEMP TMT 165 FOUNDATION Fieldbus Betriebsanleitung

FOUNDATION Fieldbus temperature transmitter
Index Parameter
9 SUB_INDEX
Category Block
Input AI (Analogue Input)
Control PID (PID Control)
SPLT (Splitter)
SPG (Setpoint Generator)
OSDL (Output Signal Selector
and Dynamic limiter)
EPID (Enhanced PID Control)
Endress+Hauser
Display Transducer
Write access with
operating mode
(MODE_BLK)
Static

11.5 Function blocks general

The function blocks contain the basic automation functions of the field device. We
distinguish between different function blocks, e.g. Analogue Input Function Block, PID
function block (PID controller), etc.
Each of these function blocks is used to execute different application functions. This
means that local control functions, for example, can be carried out directly in the field,
and device errors such as amplifier errors are reported to the automation system
automatically.
The function blocks process the input values in accordance with their specific algorithm
and their internally available parameters. They generate output values that are made
available to other function blocks for further processing by linking the individual function
blocks with each other.
Subindex of the parameters 1 - 255 to be displayed
Description
This block takes the input data from the transducer block and makes it
available to other function blocks. It has scaling conversion, filtering,
square root and low cut.
This standard block has a lot of valuables features as setpoint
treatment (value and rate limiting), filtering and alarm on PV, feed-
forward, output tracking and others.
This block is used in two typical applications: split ranging and
sequencing. It receives the output of PID block that is processed
according to the selected algorithm then it generates the values for the
two analogue output blocks.
This block generates setpoint following a profile in function of the time.
Typical applications are temperature control, batch reactors etc.
It has two algorithms:
• Output selector - selection of output by a discrete input.
• Dynamic limiter - this algorithm was developed specially for double
cross limit in combustion control.
It has all the standard features plus: bumpless or hard transfer from a
'manual' mode to an 'automatic' mode and bias.
Description
11 Appendix
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