Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N 0 5 0 0 3 0 0 3 E F o r m o r e i n f o r m a t i o n v i s i t : w w w. e a t o n . c o m
3 - 3 3 1
Example 1: control diagram
Fuzzy
Controller
PT modular
SV
FTC
+
-
e
MV
PV
Temperature
Sensor
GPWM
instruction
Y0
D22
D10
D11
The output D22 (MV) of the FTC instruction is used as the input to the GPWM instruction. D22
represents the pulse output width and D30 is the pulse output cycle. The timing chart for output Y0
is as follows.
D22
D30
Output Y0
The settings for the FTC instruction for this example are D10=k1500(target temperature),
D12=k60(sampling time is 6 seconds), D13=k8 (Bit 3=1) and D30=k6000 (=D12*100). The ladder
diagram is as follows:
M1002
MOV K1500 D10
TO K0 K2 K2 K1
FROM K0 K6 D11 K1
MOV K60 D12
MOV K8 D13
MOV K6000 D30
SET M1
M1
FTC D10 D11 D12 D22
GPWM D22 D30 Y0
M1013
FROM K0 K6 D11 K1
END
This example application is controlling an oven (The temperature it can heat is 250
℃
). A plot of the
target and real temperatures are shown below.