XGB Analog edition manual
15 - 14
(d) PWM Output Enabled
PWM output means an output method to turn a junction on – off with a duty proportional to control
output calculated by a uniform output cycle. If PWM output is enabled, it realizes PWM output in
accordance with PWM output cycle set in the parameter of PWM output junction(P20 ~ P3F)
designated in the parameter. At the moment, the PWM output cycle follows the PWM output cycle
separately set in PID operation cycle. PWM output cycle is available between 10ms ~ 6553.5ms
(setting value: 100 ~ 65,535) while it is set at a unit of integer per 0.1ms. figure shows the relation
between PID control output and PWM output.
Ex) if PWM output cycle: 1 second, PWM output junction: P20, max. output: 10000, min. output: 0
Time Output P40 junction operation
0 sec 5000 0.5 sec On, 0.5 sec Off
1 sec 3000 0.3 sec On, 0.7 sec Off
[ Figure 15.10 Relation between PWM output cycle and MV ]
(e) Set value
It sets the target of a loop in question, that is, the target status a user wishes to control. In case of
the PID control built in XGB, physical values (temperature, flow rate, pressure and etc) of an
object to control is not meaningful and instead, it should use the physical amount of an object to
control after converting them into numerals. For instance, in order to control a system using a
sensor that the output is 0V when its heating device temperature is 0 while it is 10V when the ℃
temperature is 100 as much as 50 , it is necessary to set SV as 2000℃℃ (as long as it uses AD
input module XBE-AD04A).
(f) Operation cycle
It sets the cycle to yield control output by executing the built-in PID operation. The setting cycle is
0.1ms and available between 10ms ~ 6553.5ms (setting value: 100 ~ 65,535) while it is set at a
unit of integer per 0.1ms. For instance, to set PID operation per 100ms, set the operation cycle as
1000.
(g) Proportional gain
It is intended to set the proportional coefficient of a PID loop in question (Kp). As larger Kp, the
proportional control operation is getting stronger. The scope is real number.
(h) Integral time
It sets the integral time of PID loop in question (Ti). As larger the integral time, the integral
operation is getting weaker. The scope is real number at the unit of second.
P20 output
0.5sec
0.5sec 0.3sec 0.7sec
MV = 5000 MV = 3000
Output cycle = 1sec
Output cycle = 1sec
Time
(%QX0.0.0
output)
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