MCU – Manual control unit

Block SymbolLicensing group: STANDARD

Function Description
The MCU block is suitable for manual setting of the numerical output value y, e.g. a setpoint. In the local mode ( $LOC = on$ ) the value is set using the buttons UP and DN. The rate of increasing/decreasing of the output y from the initial value y0 is determined by the integration time constant tm and pushing time of the buttons. After elapsing ta seconds while a button is pushed, the rate is always multiplied by the factor q until the time tf is elapsed. Optionally, the output y range can be constrained ( $SATF = on$ ) by saturation limits lolim and hilim. If none of the buttons is pushed ( $UP = off$ and $DN = off$ ), the output y tracks the input value tv. The tracking speed is controlled by the integration time constant tt.

In the remote mode ( $LOC = off$ ), the input rv is optionally saturated ( $SATF = on$ ) and copied to the output y. The detailed function of the block is depicted in the following diagram.

Inputs

tv	Tracking variable	Double (F64)
UP	The "up" signal	Bool
DN	The "down" signal	Bool
rv	Remote output value in the mode $LOC = off$	Double (F64)
LOC	Local or remote mode	Bool

Output

y	Analog output of the block	Double (F64)

Parameters

tt	Tracking time constant of the input tv $⊙$ 1.0	Double (F64)
tm	Initial value of integration time constant $⊙$ 100.0	Double (F64)
y0	Initial output value	Double (F64)
q	Multiplication quotient $⊙$ 5.0	Double (F64)
ta	Interval after which the rate is changed [s] $⊙$ 4.0	Double (F64)
tf	Interval after which the rate changes no more [s] $⊙$ 8.0	Double (F64)
SATF	Saturation flag	Bool
	off .. Signal not limited on ... Saturation limits active
hilim	Upper limit of the output signal $⊙$ 1.0	Double (F64)
lolim	Lower limit of the output signal $⊙$ -1.0	Double (F64)

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