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4.9.2. Setting the total (actual)
4.9.2.1. Setting the total pulse (total rate, pulse width)
Description
Set to totalize a process variable (flow rate) by total meter, etc. according to total pulse output.
Total rate: Total amount (volume) per pulse.
A pulse is outputted when the total volume has attained an amount set by the pulse value, and adds to the total pulse count (in case of
total pulse indication). Settable range: 0.000001 to 99999999
* Set the total unit before setting the pulse value. (See Section 4.8.3.)
Pulse width: Width of total pulse output.
Select a pulse width according to a corresponding total meter out of menus. Settable range: 5ms, 10ms, 50ms, 100ms, 200ms,
500ms, 1000ms.
Restrictions in the setup
Output of total pulses involves the following restrictions depending on the DO output port (DO1 and DO2).
DO output port
DO1, DO2: Transistor, open collector
The maximum output frequency is also restricted by the setup of the pulse width. Therefore, set the pulse width and pulse value so
that both of condition 1 and condition 2 indicated below are satisfied. Correct results may not occur, if any setup that does not satisfy
both of condition 1 and condition 2 is made.
Condition 1:
(Note1)
3
FULL SCALE
[m
/s]
3
TOTAL RATE [m
]
Condition 2:
(Note1)
3
FULL SCALE
[m
/s]
3
TOTAL RATE [m
]
Note 1) The range of FULL SCALE1 or FULL SCALE2, whichever is larger, is the object in the case of automatic 2-range setup,
forward and reverse range setup or forward and reverse automatic 2-range setup.
Note 2) The output frequency on the output ports is limited when the flow rate exceeds the set range. Therefore, if such a setup that
the maximum frequency per range occurs at the time of 100% flow rate, there is possibility that the total pulse output will be
incapable of following when the flow rate exceeds 100%, and accurate total value cannot be obtained if over-range continues
for a long time. If there are cases where the flow rate exceeds 100%, modify the set range and pulse value so that the
maximum frequency will not exceed the restricted level.
Example of calculation
Calculate the range that permits setup of the total value under the range and pulse width indicated below.
When the range and the pulse width are as follows.
3
FLOW SPAN -1: 36[m
/h] (=0.01[m
Condition 1
FULL SCALE [m
TOTAL RATE
As above:
0.1 [L] TOTAL RATE ·············································································································· A
Condition 2
TOTAL RATE FULL SCALE [m
The settable range of the total value that satisfies both of condition 1 and condition 2 is as follows from results of calculation A and B.
1 [L] TOTAL RATE
Note) When the total setting value is "0", total pulse is not output.
Note) When setting, stop status is set at the total mode.
For actual keying, refer to the typical operation indicated below. Set the protection to OFF beforehand. (See Section 4.4.1.)
- 34 -
Frequency range of pulse output
(at full scale flow rate)
100 pulse/sec
100[Hz]
1000
2 × PULSE WIDTH [ms]
3
/s]), Pulse width:50[ms]
3
3
/s]
0.01 [m
/s]
=
100[Hz]
100 [Hz]
3
= 0.0001 [m
] = 0.1 [L]
2 × PULSE WIDTH [ms]
3
/s] ×
1000
Pulse width
5ms, 10ms, 50ms, 100ms, 200ms
2 × 50 [ms]
3
= 0.01 [m
/s] ×
1000
3
= 0.001 [m
] = 1 [L] ························ B
INF-TN3FLR-E
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