172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
267
Parameter setting
Remote/Local transfer (2-loop control/Differential temperature control)
[Operation Transfer Mode]
Parameter symbol
Data range
Factory set value
R/ L
When “2-loop control/Differential temperature control” is
selected at Select function for input 2
2LooP
: 2-loop control
dIFF
: Differential temperature control
2LooP
To display “Remote/Local transfer” (2-loop control/Differential temperature
control),
choose “2-loop control/Differential temperature control” in Function
block No. 58: Select function for Input 2 (Engineering mode).
Select function for input 2 [Engineering mode: Function block No. 58 (
Fn58
)]
Parameter symbol
Data range
Factory set value
r
2 P V
0: No function
1: Remote setting input
2: 2-loop control/Differential temperature control
3: Control with PV select
4: Cascade control (Slave single
Cascade) *
5: Cascade control (Master single
Cascade) *
6: Input circuit error alarm
PID control: 0 to 6
Pressure/temperature control operation [MC-(V)COS(R)]: 0 to
2, 6
Heating/Cooling control: 0 to 3, 6
1
Refer to “4. Parameters that are Initialized/Modified when Setting is Changed”
for the parameters that are initialized or changed when the Select function for
input 2 is changed.
8.12 Executing Differential temperature control
Input 1 is controlled by setting a temperature difference between Input 1 and Input 2.
Description of function
Differential temperature control is conducted, while Input 1 is used as Control
temperature and Input 2 is used as Reference temperature.
Temperature difference is set on Input 1 against Input 2, and the Input 1 is controlled
so that the set temperature difference could be obtained. As the input 2 can also be
controlled, the differential temperature control is possible while keeping the reference
temperature constant.
In case of Differential temperature control, the Input 1_Set value (SV) is not used
for control. The Input 1_Monitor Set value (SV)* of is used in actual control.
* Input 1_Monitor Set value (SV) = Controlled temperature = Input 2_Measured value
(PV) [Reference temperature] + Set value of Differential temperature input
Содержание SC-F71
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