IDEC SmartRelay functions
IDEC SmartRelay Manual
223
Parameters p (number of decimals)
Parameter p applies only to the display of the Ax value in a
message text
Functional description
The function reads the value of the signal at the analog input
Ax.
This value is multiplied by the value of parameter A (gain).
Parameter B (offset) is added to the product, as follows:
(Ax * Gain) + Offset = Actual value Ax
The function block calculates the proportion of the actual
value Ax to the range. The block sets the digital output Q
high for the same proportion of the T (periodic time)
parameter, and sets Q low for the remainder of the time
period.
Examples with Timing Diagrams
The following examples show how the PWM instruction
modulates a digital output signal from the analog input value:
1. An analog value of 500 (range 0...1000) as the value for
Ax must be modulated to a digital signal string. The user-
defined T (periodic time) parameter is 4 seconds. At the
digital output of the PWM function the digital signal string
is 2 seconds high, 2 seconds low, 2 seconds high, 2
seconds low and continues in that pattern as long as
parameter En = high.
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