YOKOGAWA FA-M3 VITESSE F3CX04-0N, User Manual

Page: 98 / 144

C2-8
IM 34M06H63-01E 1st Edition : July, 2003-00
C2.3 Input Range Setting
For each instrument range selected, you may define an input range, which is the actual
temperature range to be monitored, by specifying upper (RH) and lower (RL) limits within
the instrument range. Some input types such as thermocouple W, however, allow an input
range that is wider than the instrument range. For more details, see Table C2.3, "Input
Type Selection." For example, to define an input range of 200.0-800.0

C for an instrument
range of -200.0 to 1200.0

C for a thermocouple J input, set RH = 8000 and RL = 2000
(SH/SL are equal to RH/RL for temperature input). Likewise, to define an input range of
2-4 V for an instrument range of 1.000-5.000 V for DC voltage input with a display range of
0.0-50.0, set RH = 4000, RL = 2000, SDP = 1, SH = 500, and SL = 0.
Example for temperature input
-200.0°C 1200.0°C
Instrument range
Input range
200.0°C 800.0°C
Input range lower limit (RL)
Scaling lower limit (SL)
Input range uppler limit (RH)
Scaling upper limit (SH)
Define the range
to be actually
monitored.
Parameters to be set for temperature input
(1) Input type selection: Set according to the sensor used.
(2) Input range upper limit (RH): Set to the upper limit of an input range.
(3) Input range lower limit (RL): Set to the lower limit of an input range.
Note: For temperature input, scaling uppler and lower limits (SH/SL) are
fixed at the input range upper and lower limits (RH/RL) respectively.
Example for DC voltage input
1.000 V 5.000 V
Instrument range
Input range
0.0m
3
/h
Scaling lower limit (SL)
Scaling upper limit (SH)
Define the range
to be actually
monitored.
Parameters to be set for DC voltage input
(1) Input type selection: Set according to the sensor used.
(2) Input range upper limit (RH): Set to the maximum value for input signals.
(3) Input range lower limit (RL): Set to the minimum value for input signals.
(4) Scaling decimal point position (SDP): Set the decimal point position for input signals.
(5) Scaling upper limit (SH): Set to the upper limit of an input range
(set to the display value for the maximum input signal).
(6) Scaling lower limit (SL): Set to the lower limit of an input range
(set to the display value for the minimum input signal).
2.000 V 4.000 V
50.0m
3
/h
Scaling range
RL = 1.000 RH = 4.000
Input range upper limit (RH)
Input range lower limit (RL)
Table C2.2 Examples of Input Range Setting
As shown in Figure C2.1, "Block Diagram of Input-related Functions," input values within a
defined input range undergo computation before it is provided as an input process value,
PVIN, to the system. For details on the computations performed, see Sections C2.9,
"Square Root Extraction," C2.7, "Broken-line Biasing," C2.8, "Fixed Biasing," and C2.10,
"Input Filtering."
Table C2.5 Parameters of Input-related Functions
Data Position Number
Symbol Description Unit Data Range
Default
Value Attribute Stored
See
Also
CH1 CH2 CH3 CH4
101 301 501 701 PVIN Input process value Industrial
unit
From -5.0% to 105.0% of
(SH - SL)
− RO −
143 343 543 743 RH Input range upper limit Industrial
unit
See Table C2.3, "Input Type Selection."
RW

C2.3
144 344 544 744 RL Input range lower limit
145 345 545 745 DEC.P Decimal point position None RO

146 346 546 746 SH Scaling upper limit
None
-30000 to 30000;
0 < SH - SL

30000.
Changeable only
for DC voltage
input with a
maximum
resolution of 14
bits (16383).
Other than DC
voltage input RH RW

C2.3
DC voltage
input 1000
147 347 547 747 SL Scaling lower limit Other than DC
voltage input RL RW

DC voltage
input 0
148 348 548 748 SDP Scaling decimal point
position
None
0 to 4
Changeable only
for DC voltage
input
Other than DC
voltage input DEC.P RW

DC voltage
input 1
CAUTION
Changing an input range does not affect resolution.