Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 460)

8 Application Instructions API 100-149
DVP-PLC Application Manual 8-58
API Mnemonic Operands Function
145 FTC Fuzzy Temperature Control
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices Word Devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * *
S
2
* * *
S
3
*
D *
FTC: 9 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
1
: Set value (SV) S
2
: Present value (PV) S
3
: Parameter (sampling time) D: Output value (MV)
Explanations:
1. Range of S
1
: 1 ~ 5000 (shown as 0.1 °C ~ 500°C). Unit: 0.1°. If (S
3
+1) is set as K0, the range will be 0.1 °C ~
500 °C.
2. Range of S
2
: 1 ~ 5000 (shown as 0.1 °C ~ 500°C). Unit: 0.1°. If (S
3
+1) is set as bit0 = 0, the range will be 0.1 °C
~ 500 °C. Therefore, when the user obtain an A/D value from the temperature sensor, the value has to be
converted into a value between 1 ~ 5,000 by four arithmetic operation instructions.
3. If S
3
< K1, the instruction will not be executed. If S
3
> K200, S3 will adopt K200. S
3
will occupy 7 consecutive
devices.
4. See the specifications of each model for their range of use.
5. Settings of parameter S
3
+1: bit0 = 0 -> °C; bit1 = 0 ->°F; bit1 = 0 -> no filter function; bit1 = 1 -> with filter
function; bit2 ~ bit5 -> 4 kinds of heating environments; bit6 ~ bit15 -> reserved. See remarks for more
information.
6. D is the value between 0 ~ sampling time × 100. When using this instruction, the user has to adopt other
instructions according to the types of the heater. For example, FTC can be used with GPWM for output pulse
control. “Sampling time × 100” is the cycle of GPWM pulse output; MV is the width of GPWM pulse. See
program example 1.
7. There is no limit on the times of using FTC instruction, but Do not repeatedly use a designated operand in case
an error may occur..
Program Example:
1. Set up the parameter before executing FTC instruction.
2. When X0 = On, the instruction will be executed and and result will be stored in D150. When X0 = Off, the
instruction will not be executed and the previous data remain unchanged.
X0
FTC D0 D1 D100 D150