
3100/3200 Series
50 Part No HA028651 Issue 3.0 Mar-06
10. Setpoint Generator
The setpoint generator provides the target value at which it is
required to control the process. It is shown in the controller
block diagram, Section 7. The following functions are
available:-
Number of
setpoints
Two - setpoint 1 (SP1) and setpoint 2 (SP2).
Each may be selected by a dedicated
parameter or externally switched via a digital
input suitably configured as described in
section 9.1.10.
An application example might be to use SP1
for normal operation and SP2 to maintain a
low overnight temperature.
Setpoint
limits
High and low limits can be pre-set to prevent
inadvertent adjustment of the setpoint beyond
that allowable for the process
Set point
rate limit
Allows the setpoint to change from its current
level to a new level at a fixed rate.
Direct
setpoint
access
The selected setpoint is accessible directly
from the HOME display by pressing the raise
or lower buttons
10.1 Setpoint Parameters
SETPOINT LIST ‘SP’
Name Scrolling Display Parameter Description Value Default Access Level
SP1
Setpoint 1 selected
SP.SEL
SETPOINT SELECT This enables the main or secondary
setpoint to be selected form the front
panel buttons
SP2
Setpoint 2 selected
SP1
L3
SP1
SETPOINT 1 Main or normally selected setpoint Low to high setpoint limits
0
L3
SP2
SETPOINT 2 Secondary or standby setpoint Low to high setpoint limits
0
L3
SP.HI
SETPOINT HIGH
LIMIT
Maximum allowable setpoint setting Setpoint low limit (SP.LO) to high
range limit. Also limited by the rng.hi
and rng.lo parameters
Range
High Limit
L3
SP.LO
SETPOINT LOW
LIMIT
Minimum allowable setpoint setting Low range limit to Setpoint high limit
(SP.HI). Also limited by the rng.hi
and rng.lo parameters
Range
Low Limit
L3
rE m . s p
REMOTE SETPOINT Reads the current remote setpoint
value when remote setpoint is in use
Read only
No
Not selected
l-r
REMOTE SETPOINT
SELECT
To select the remote digital
communications setpoint
YES
Selected
no
Conf
SP.RAT
SETPOINT RATE
LIMIT
Limits the rate of change of the
setpoint. Operates on both SP1 and
SP2
Step change (OFF) or 0.1 to 3000
display units per minute.
Resolution one decimal place more
than PV
Off
L3
min
Minutes
Hour
Hours
ra m p u
SETPOINT RAMP
UNITS
To set the units for the setpoint rate
limit
SEC
Seconds
min
L3
lo c . t
LOCAL SETPOINT
TRIM
To apply a fixed offset to the setpoint
in use
-199.9 to 300.0
0.0
L3
REM.HI
REMOTE INPUT
HIGH SCALAR
Sets the maximum scale limit for the
remote setpoint
REM.lo
REMOTE INPUT
LOW SCALAR
Seta the minimum scale limit for the
remote setpoint
Between Range High and Low Limits L3
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