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COTRUST CTH200 Series - Using CTH200 PLC Thermocouple PID Control Module Library

COTRUST CTH200 Series
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Appendix
186
Application program
Explanation
PID_T parameter explanation
Parameter
Address or
value
Explanation
Note
LOOP
0
0 for first loop
CTRL_WORD
VW10
SP
VW12
PV
AIW0
MAX_PV
13700
Maximum input is 13700 for K
thermocouple
OUT_CYCLE
2
2s, pulse output cycle
TUNING_K
1.0
TUNING_ON
M0.1
Set from 1, reset after setting.
Kp
VW14
Kp, setting value will automatically write to
this variable after setting, users can adjust
themselves.
i
VW16
i, setting value will automatically write to
this variable after setting, users can adjust
themselves.
Td
VW18
Td, setting value will automatically write to
this variable after setting, users can adjust
themselves.
STATUS_WOR
D
VW20
Status Word
HEAT_ON
Q0.0
Heating output
COOL_ON
L0.0
Use a local variable for unused
PID_OUT
LW2
Use a local variable for unused
D.2 Using CTH200 PLC Thermocouple PID Control Module Library
Function introduction
The "PID_setting" function library is specially designed to provide parameter setting for the
thermocouple PID expansion module (e.g., SM231-7TD, SM231-7TF). Integrate PID algorithm
inside the thermocouple PID module. No complex programming, but only needs to call
"PID_setting" library to set some simple parameters to use module, and the temperature control
is accurate.

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