5-39
Chapter 5. Functions
SP ramp type
Whether to execute a step operation can be set.
What happens when the power is turned off and back on during a step operation can
also be specified with this item.
5 - 6 Step operation (p.5-38) (for step operation)
Item (bank) Display Description Initial value User level
SP ramp type
(setup bank)
C 31
0: Standard
1: Multi-ramp
2: Step operation enabled: Step operation
does not resume when the power is turned
back on (shifts to READY)
3: Step operation enabled: Step operation
resumes when the power is turned back on
0 Advanced
• Set 2 or 3 to enable step operations.
• 2: If a power failure occurs during a step operation (in RUN mode), when the
power is turned back on, the step operation does not resume (this device enters
READY mode) and the SP returns to its value at the beginning of the step
operation.
• 3: If a power failure occurs during a step operation (in RUN mode), when the
power is turned back on, the step operation resumes from the step that was being
processed when the power failure occurred. However, operation cannot restart
at exactly the same point of time and SP as when the power failure occurred. The
step operation resumes as follows.
If a power failure occurs during a SOAK, the operation will resume from the
beginning of the SOAK. If a power failure occurs during a RAMP and there was
no PV alarm (AL01/AL02), the operation will resume with an SP that is the same
as the PV in that RAMP. If a power failure occurs during a RAMP and there was
a PV alarm (AL01/AL02), the operation will resume with the SOAK that follows
that RAMP.
Handling Precautions
• Operation of the C1M with setting 3 (step operation enabled: the
operation resumes when the power is turned back on) differs from the
setting 3 operation of Azil’s DCP digital program controllers (DCP31/32,
DCP551/552). With the DCP, operation restarts at the point of time in the
RAMP or SOAK that was in progress when the power failure occurred,
and with the SP at that time. With the C1M, operation restarts from the
beginning of the RAMP or SOAK that was in progress.
• If setting 3 is used, pay attention to the number of times data is written
to EEPROM (nonvolatile memory). During a step operation in RUN mode,
every time a RAMP or SOAK segment starts, data is written to EEPROM.
If step operations are repeated with 10-minute or shorter RAMP/SOAK
time, the service life of writing to EEPROM (about 100,000 times) will be
exceeded within 2 years.
• If
C31
(SP ramp type) is set to 0 (standard) or 1 (multi-ramp) and if this
device is in RUN mode, when the setting is changed to 2 or 3 (step
operation enabled), this device automatically enters READY mode.
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