User`s guide

Function Blocks

Function Block Categories and Types

Release E UMC800 Control Builder User’s Guide 57

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Loops category

For examples of Loop Block applications, refer to Appendix B – Loop Application Examples.

Table 15 lists the function block types in the Loops category.

Table 15 Loops category function block types

Block Type Description Graphic Form

Analog Input - Reads value of an Analog Input from a

specified real I/O address. Converts an analog input value to

corresponding output in engineering units based on the

necessary scaling and conversions performed.

Analog Output - Regulates Analog Output current. Input and

output scaling is available.

TPO

Time Proportioning Output - Proportions the amount of ON

time and OFF time of a digital output. Input scaling and cycle

time available. Time proportioning outputs are commonly

used for electrically heated applications where regulating the

amount of ON time vs OFF time of a heater is used to control

temperature.

PID Proportional, Integral, Derivative - Control for 3-mode

single-loop control application with:

• Autotuning with Fuzzy Logic overshoot suppression

• PID-A, PID-B, Duplex equations

• 2 set of PID Constants

• 2 Setpoint Values

• 2 Alarms

• Feedforward

• Ratio Control

• External Mode Switching

• Cascade capability