Yokogawa Button Operated MV2000 - Manual (Page 98)

3-18
IM MV1000-01E
3.10 Countng Pulses (/PM1 opton)
• Example 1: Pulse Sum
Display the sum of the pulses from pulse input terminal 6.
Number of pulses
per scan interval
TLOG.SUM
Pulse sum value
Pulse input
Scan interval
Time
(Sum)
P6
Calculaton Expresson
Select the channel and set the calculation expression. Set an appropriate Span
Lower, Span Upper, and Unt.
Channel Calculaton Expresson Descrpton
101 TLOG.SUM(P6) The sum of the number of pulses in each scan
interval.
• Example 2: Pulses Per Mnute
Using the MV2008 (scan interval 250 ms), count the number of pulses received by
pulse input terminal 6, and calculate the number of pulses per minute.
Number of pulses
per second
101ch
102ch
Number of pulses
per minute
Pulse input
Sampling interval
(250 ms)
Time
(Moving average over a minute)
(60x)
Calculaton Expresson
This table shows which calculation expressions to assign to which channels. Set an
appropriate Span Lower, Span Upper, and Unt.
Channel Calculaton Expresson Descrpton
101 Q6 Number of pulses per second
102 101*K01 Number of pulses per minute
Constant Value Descrpton
K01 60 The coefficient for converting pulses per
second to pulses per minute.
Channel Rollng Average Descrpton
101 Interval: 1 s Moving average over a minute
Number of samples: 60
Channel
Computation starts with the smallest channel number at every scan interval.
Assign larger channel numbers to computation channels that calculate pulses per
minute than you assign to computation channels that calculate pulses per second.