L
--
740
--
28
--
E
101
NOTE:
9.12 Pulse Output Function
The transmitter is provided with two pulse outputs which can be set up as independent outputs. Attractive
features include a double pulse output created by allowing two pulses out of phase by 90 or 180 degrees,
and a bidirectional pulse output - linked with status output signal, enabling the operator to discriminate the
direction of flow. Refer to the following topics for description of these features.
(NOTE: When the pulse output assignment, full scale flowrate, or frequency at full scale is modified, the
Counter/Totalizer will be reset.)
9.12.1 Pulse output 1
If you want to use pulse output 1, it is required that the following be set up.
For using bidirectional pulse output or double pulse output, be sure to set the assignment of interest.
(1) Setup procedure
① Pulse output 1 assignment (Assign) (See 9.2.4 Transition chart (3) [No. 2-4-3-1].)
Kind of flow is selected.
・Mass Flow: Mass flow
・Volume Flow: Volumetric flow
② Frequency of pulse output 1 at full scale flowrate (Freq Factor) (See 9.2.4 Transition chart (3)
[No. 2-4-3-2].)
The frequency at the flowrate set in ③ is set up. Set it to match the measurable range of the
instrument that measures pulse output. Acceptable setting range is from 0.1 to 10000Hz.
③ Full scale flowrate of pulse output 1 (Rate Factor) (See 9.2.4 Transition chart (3) [No. 2-4-3-3].)
An output is generated at the frequency set in ② when the preset flowrate is reached.
④ Low flow cutoff of pulse output 1 (Lowcut) (See 9.2.4 Transition chart (3) [No. 2-4-3-4].)
When the proportion of flowrate is smaller than the low flow cutoff value - where the flowrate set
in ③ is set to 100% - the output is clamped at 0. Acceptable setting range is from 0.0 to 10.0%.
⑤ The state of pulse output in an error (Pulse) (See 9.2.5 Transition chart (4) [No. 2-4-6-2].)
Pulse output value in an error can be selected from the following three options:
・Zero: Pulse output is halted.
・Hold: Pulse output immediately before an error is maintained.
・Upscale: 11kHz is output. (For detail of output in an error, see 10.1 Error Messages.)
9.12.2 Pulse output 2
If you want to use pulse output 2, it is required that the following be set up.
For using bidirectional pulse output or double pulse output, be sure to set the assignment of interest.
(In the case of double pulse output, set only pulse output 2 assignment. Invalidating parameters other
than that, pulse output 2 is also output with the same setting as that of pulse output 1.)
① Pulse output 2 assignment (Assign) (See 9.2.4 Transition chart(3) [No. 2-4-4-1].) Type of flow to
be assigned is selected.
・Mass Flow: Mass flow
・Volume Flow: Volumetric flow
・Double pulse 90: Double pulse output 90°
・Double pulse
－
90: Double pulse output
－
90°
・Double pulse 180: Double pulse output 180°
As for double pulse output, see 9.12.4 Double pulse output.
As for ②, ③, and ④ below, a procedure similar to pulse output 1 applies. See 9.12.1 Pulse output (1).
② Frequency of pulse output 2 at full scale flowrate (Freq Factor) (See 9.2.4 Transition chart (3)
[No. 2-4-4-2].)
③ Full scale flowrate of pulse output 2 (Rate Factor) (See 9.2.4 Transition chart (3) [No. 2-4-4-3].)
④ Low flow cutoff of pulse output 2 (Lowcut) (See 9.2.4 Transition chart (3) [No. 2-4-4-4].)
⑤ The state of pulse output in an error (Pulse) (See 9.2.5 Transition chart (4) [No. 2-4-6-2].)
For this function, the setting change is disabled in
Write Protect mode (refer to section 9.2).
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