59
rdu
°
C/
°
F Selection
To change the temperature display unit from
°
C to
°
F, press the Up Key so that
f
will be displayed in the set value display.
c
:
°
C
f
:
°
F
SV
SV
The communications specifications of the E5
J are as follows:
Data bit length: ASCII 7- (set before shipping) or 8-bit code
Parity check: None, even (set before shipping), or odd
Stop bit length: 1 or 2 (set before shipping)
Use the following parameters to change the above setting.
len
Data Bit Length
Use this parameter to change the communications data bit length.
prty
Parity Check
Use this parameter to change the communications parity check.
none
: None
eUen
: even
odd
: odd
SV
SV
SV
sbit
Stop Bit
Use this parameter to change the stop bit length.
s
.
t
-
b
Stable Range (
°
C/
°
F)
This parameter is used to decide conditions under which fuzzy self-tuning oper-
ates and can be set within a range of 0.1 to 999.9. If the absolute value of the
deviation (the difference between the process value and set point) is within the
stable range, temperature control operation is deemed smooth and fuzzy self-
tuning will not start.
Set point
Stable
range
Stable
It is deemed that the characteristics
of the control device have been
changed so that the response wave-
form is processed to tune the PID
constants.
PID before tuning
PID after tuning
Fuzzy self-tuning
alfa
(
α
) PID Control Type
By adjusting internal parameter
α
of advanced PID within a range of 0.00 to 1.00,
PID control such as derivative preceding PID or proportional preceding PID (I-
PD) control will be possible.
Set point
α =
0.00 (Derivative preceding PID)
α =
1.00
(Proportional preceding PID)
Difference in set point response due to
α
.
α =
0.65
To increase the set point response speed, decrease the value of parameter
α
. If
the value of parameter
α
is decreased, however, the overshooting value will in-
crease.
E5
J with
Communications Function
Engineering Level Parameters
Section 9-3
