Installation and Operation Handbook
Programmer Operation
5.2
Programmer States
Programs has five states:
−
Reset, Run, Hold, Holdback
and
End.
State
Description
Indication
Reset
In Reset, the programmer is inactive and the controller behaves as a standard
controller, with the setpoint determined by the value set in the lower readout.
Both the RUN and
HOLD lights will be
off
Run
In Run, the programmer varies the setpoint according to the active program.
RUN light on
Hold
In Hold, the program is frozen at its current point. In this state you can make
temporary changes to any program parameter (for example, a target setpoint, a dwell
time, or the time remaining in the current segment).
Such changes only remain
effective until the program is reset and run again, when they are overwritten by
the stored program values.
Note:
When a program is running, you cannot alter a
cALL
ed
program until it
becomes active within that program.
HOLD light on
Holdback
Holdback indicates that the measured value is deviating from the setpoint by more
than a pre-set amount and that the program is in Hold, waiting for the process to catch
up. See
Holdback
in the section on Automatic behaviour later this Chapter.
HOLD light flashes
A master controller can re-transmit a setpoint value to a number of slave units using
PDSIO setpoint retransmission. Any of the slave units can generate a holdback
signal which will also flash the
HOLD
light. Holdback will also occur if the PDSIO
output is open circuit. This can be disabled in configuration by selecting the
PdS
output as
SP.nH
- ‘setpoint retransmission without holdback’
HOLD light flashes
End
The program is complete.
RUN light flashes
Table 5-2: Program states
HA025041 issue 12 Aug 14 5-3
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