IDEC FL1E SmartRelay - Manual (Page 236)

IDEC SmartRelay functions
222 IDEC SmartRelay Manual 
4.4.29 Pulse Width Modulator (PWM)
Short description
The Pulse Width Modulator (PWM) instruction modulates the
analog input value Ax to a pulsed digital output signal. The
pulse width is proportional to the analog value Ax.
Parameter T
Note the defaults of the T parameters listed in Chapter 4.3.2.
The periodic time T can be provided by the actual value of
another already-programmed function. You can use the
actual value of the following functions:
• Analog comparator (actual value Ax - Ay, see Chapter
4.4.18)
• Analog trigger (actual value Ax, see Chapter 4.4.16)
• Analog amplifier (actual value Ax, see Chapter 4.4.20)
• Analog multiplexer (actual value AQ, see Chapter 4.4.26)
• Analog ramp control (actual value AQ, see Chapter
4.4.27)
• Analog math (actual value AQ, see Chapter 4.4.30)
• PI controller (actual value AQ, see Chapter 4.4.28)
• Up/down counter (actual value Cnt, see Chapter 4.4.13).
Select the required function by the block number. The
timebase is configurable. For information on valid ranges
and parameter defaults, refer to Chapter 4.4.1.
Symbol in IDEC
SmartRelay
Wiring Description
Input Ax Analog signal to be modulated to a
pulsed digital output signal.
Parameter Min:
Range of values:
20,000
Max:
Range of values:
20,000
A: Gain 
Range of values: 10.00
B: Zero offset 
Range of values: 10,000
T: Periodic time over which the digital
output is modulated
p: Number of decimals 
Range of values: 0, 1, 2, 3
Output Q Q is set or reset for the proporition of
each time period according to the
proportion of the standardized value
Ax to the analog value range.