C3-9
IM 34M06H62-02E 2nd Edition : June 2008-00
C3.4
PV Range Setting (for use in two-input
changeover mode only)
The PV range setting defines the range of the output process value in Two-input
Changeover mode, in cases where the two input signals have different input ranges. The
PV range setting can only be changed in the two-input changeover mode and no other
mode.
For example, if input 1 (loop 1) has input range of 0-500C (RL=0C; RH=500C) and
input 2 (loop 2) has input range of 300-1000C (RL=300C; RH=1000C), you may set
the PV range of loop 2 to 0-1000C (PRL=0C; PRH=1000C).
PV range
Input 2 range
Input 1 range
0 300 500 1000
RL1
PRL2
RH1
RH2
PRH2
RL2
°C
In the figure, a number after a parameter symbol denotes a loop number. For example, RL2 means the input range
lower limit (RL) for loop 2.
Figure C3.3 Examples of PV Range Setting
Table C3.6 PV Range Parameters
Data Position Number
Symbol Description Unit Data Range
Default
Value
Attribute
Stored
Loop 1 Loop 2 Loop 3 Loop 4
101 301 501 701 PVIN Input process value
Industrial
unit
-5.0% to 105.0% of (SL to SH) — RO —
102 302 502 702 PV Process value
Industrial
unit
-5.0% to 105.0% of (PRL to
PRH)
— RO —
351 751 PRH
PV range upper limit
Industrial
unit
-30000 to 30000;
0 < PRH - PRL 30000.
Changeable only for even
loops in Two-input
Changeover control with a
maximum resolution of 14 bits
(16384).
SH RW
352 752 PRL PV range lower limit
Industrial
unit
SL RW
353 753 PDP
PV range decimal
point position
None
0 to 4
Changeable only for even
loops in Two-input
Changeover control. Always
the same as SDP.
SDP RW
For details on how to switch between two inputs, see Section C3.11, "Two-input
Changeover."
PRH and PRL (PV range) are set by default to RH and RL (input range) of the even loop
(2 or 4) for temperature input, or SH and SL (scaling range) of the even loop for DC
voltage input. Redefine the PRH and PRL values as necessary.
CAUTION
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