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6-9. Zone PID
The PID control of this instrument allows you to select and set the zone method.
In the zone PID control, a measuring range is divided into three types maximum, and control is carried out with PID No.
which is selected automatically from an SV value set for each step.
Its basic action is: PID No. changes when control output becomes larger than an SP value or smaller than a zone hysteresis. An
example of its action is diagramed below.
Zone 1 SP = 100°C No.1
Zone 2 SP = 200°C No.2
Zone 3 SP = 300°C No.3
When above diagram shows SV as: Below 200˚C
ĺ
Action with PID No.
1
200˚C ~ 300˚C
ĺ
Action with PID No.
2
Above 300˚C
ĺ
Action with PID No.
3
When the setting of zone SP is changed as follows
:
Zone 3 SP: 100˚C Below 200˚C
ĺ
Action with PID No.
3
Zone 1 SP: 200˚C 200˚C ~ 300˚C
ĺ
Action with PID No.
1
Zone 2 SP: 300˚C Above 300˚C
ĺ
Action with PID No.
2
* When the same zone SP value is set, the lowest number is used preferentially.
* Even when a zone SP value in action is changed within a zone hysteresis, PID No. is not changed as long as output remains within the
hysteresis.
6-10. External Control Input (DI)
The instrument has four DIs. DI is caused to function when any other item than non is set on the setting screen and external
terminals are shorted. Action caused by each setting is described below:
RUN/RST
Switching between RUN and RST. As this is assigned to DI1 fixedly, the setting is unable to be changed. Being edge input, RUN and RST
are switched by shorting across terminals 1 and 2.
ADV
As on the 0-6 ADV execution screen, when executed, the present step comes to an end and is forced to proceed to the next step. Being
edge input, ADV is executed every shorting across terminals.
HLD
As on the 0-5 HLD execution screen, when executed, the present step time is temporarily suspended and SV is fixed. Being level input,
shorting across terminal puts HLD in execution and opening releases it. A change in step time, step SV, time signal ON/OFF time, etc.
does not take effect until HLD is released.
FIX
As on the 3-1 FIX mode ON/OFF setting screen, when executed, the FIX mode turns ON. Being
level input, shorting across terminals turns the FIX mode ON and opening releases it.
SPT3
A pattern No. at the start of program action is selected by 3 bits of DI2 - DI4.
SPT2
A pattern No. at the start of program action is selected by 2 bits of DI3 and DI4. Being level input,
shorting across terminals produces "1" and opening "0". Since the time for removing chattering of
level input is
125msec, edge input action need to remain ON for 125msec or longer. If a number exceeding the
number of patterns is input, a maximum number of patterns allowed to be set can be set.
For example: Where the number of patterns = 2 and DI input is 011, the number of start pattern is 2.
S
P
T
3
DI4, 3, 2
0
0 0 Start with pattern 1
0
0 1 Start with pattern 1
0
1 0 Start with pattern 2
0
1 1 Start with pattern 3
1
0 0 Start with pattern 4
1
0 1 Start with pattern 4
1
1 1 Start with pattern 4
S
P
T
2
DI4, 3
0
0 Start with pattern 1
0
1 Start with pattern 1
1
0 Start with pattern 2
1
1 Start with pattern 3
Not possible Start with pattern 4
