C4-3
IM 34M06H62-02E 2nd Edition : June 2008-00
C4.2 Remote Set Point
Any one of the pre-defined set points (1.SP to 4.SP) or a remote set point (RSP) can be
selected as the control set point (CSP). The RSP signal is intended to be updated
continually (for example, as a ramp signal from the CPU module) and hence, is not
stored to the EEPROM when updated.
- For a loop in Single-Loop mode or Two-input Changeover mode, or the primary loop
of Cascade control mode, set the Remote/Local Selection (RMT/LOC) parameter to
1 (Remote).
- Set the Remote Set Point (RSP) to a desired set point value.
Changing the SP Number Selection (SPNO) parameter during remote operation selects
the following parameters (where n denotes the value of SPNO, and is an integer ranging
from 1 to 4).
- n.A1 Alarm 1 Preset Value
- n.A2 Alarm 2 Preset Value
- n.A3 Alarm 3 Preset Value
- n.A4 Alarm 4 Preset Value
TIP
If the Zone PID Selection (ZONE) parameter is set to ‘0: Disabled’, changing the SP Number Selection
(SPNO) also changes the PID constants, including PB, TI and TD. For details on the parameters that are
changed, see Section C6.9, “PID Selection Method”.
Table C4.2 Parameters Related to Remote Set Point
Data Position Number
Symbol Description Unit Data Range
Default
Value
Attribute
Stored
Loop1 Loop2 Loop3 Loop4
103 303 503 703 CSP Control set point
Industrial
unit
PRL to PRH — RO —
122 322 522 722 A/M/C
Automatic/manual/cascade
selection
None
0: Automatic
1: Manual
2: Cascade
*1
0 RW —
124 324 524 724 RMT/LOC Remote/local selection None
0: Local
1: Remote
0 RW —
133 333 533 733 RSP Remote set point
Industrial
unit
PRL to PRH PRL RW —
*1 The controller mode must be set to Cascade Control before Automatic/Manual/Cascade Selection (A/M/C) can be
set to 2 (Cascade). In cascade control mode, operation proceeds according to the setup for the even-numbered loop
(2 or 4).
The remote set point function is not available for the secondary loop in cascade control
mode.
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