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117

Using the Simple Program Function Section 4-15

Starting Method Any of the following three methods can be used to start the simple program.

• Setting the Program Start parameter to STRT.

• Turning ON an event input. (The program start must be assigned to an

event input. See note.)

• Starting with an Operation Command using communications. (When the

program start is not assigned to an event input.)

Note When the simple program is started and reset, writing is performed to

EEPROM. Be sure to consider the write life (1 million writes) of the EEPROM

in the system design. When the program start is assigned to an event input,

the Program Start parameter will function as a monitor display, and the RSET/

STRT displays can be used to check when the event input has started or reset

the simple program. When this is done, the Program Start parameter func-

tions as a monitor display only and cannot be changed using key operations.

If the Program Pattern parameter is set to OFF, the event input assignment

setting will be initialized to “None.”

Soak Time and Wait Band

The wait band is the band within which the process value is stable in respect

to the set point. The soak time is measured within the wait band. The timer

that measures the soak time operates only when the process value is within

the wait band around the set point (i.e., SP

± wait band). In the following dia-

gram, the timer will be stopped between the start and (1), (2) and (3), and (4)

and (5) and will measure the time only between (1) and (2), (3) and (4), and

(5) and the end.

Note If the wait band is set to OFF, the wait band will be treated as infinity and the

timer will measure time continuously after changing from RSET to STRT.

RSET → STRT

(5)

(1) (2) (3)

(4)

Set point

Wait band

Soak time

remain

Set

oint Set

oint

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