LS Industrial Systems XBC-DR10E - Page 452

Chapter 7 Built-in High-speed Counter Function
XBC E-Type Main Unit 7-20 Ver. 1
f. In order to indicate revolution per minute (RPM), the program is as shown below. In
case of DMUL operation, RPM value is saved 64 bit in D100~D103. If operated RPM
value is used, it can use to Word or Dword type according to system (when RPM value
is a small number).
g. The example that number of pulse per 1 revolution set to ‘10’ and time is set to 60,000
ms is as shown below.
7. Count Latch
a. When Count latch signal is On, present count value is latched.
b. Setting
If present counter value needs to latch, set Count Latch function to ‘Use’.
Classification
Device area per channel
Channel 0
Channel 1
Channel 2
Channel 3
Count latch command
K2606
K2706
K2806
K2906
c. Count latch function is operated when Count latch signal is On. Counter value is not
cleared when power supply is cycled or at mode change, it is counted from previous
value.
d. In latch counter function, internal or external preset function has to be used for clearing
present value.
Com
man
d
Co
unt value
1000
500
0
30
0
400
70
0
500
35
0
Revoluti
on
per tim
e
600
00㎳ 60000
㎳ 6000
0㎳ 60000㎳
30 10
30 20