LS Industrial Systems GLOFA G7M-DR60U - Counter Processing

Chapter 5. Power Supply / CPU
5-9
3) Pulse Timer Process Time Change and Contact On/Off
If input condition turns on, output contact (Q) turns on.
The process time is newly changed when the timer function block is executed. When the process time reaches the
setting time (process time = setting time), the contact (Q) turns off.
The contact turns off after the setting time regardless of input condition off status.
The following diagram shows pulse timer timing.
4) Timer Error
The maximum timer error is ‘1 scan time + time from the start of scan to execution of the timer function block’
5.3.6 Counter processing
The CPU part counter increase/decrease the present counting value by the detection of rising edge (Off → On) of input
signal. Three types of counter are increment counter, Decrement counter and Increment/Decrement Counter. For details,
refer to GLOFA — GM Programming’.
• The Increment counter is a counter which increment the present counting value
• The Decrement counter is a counter which decrement the present counting value
• The Increment-Decrement counter is a counter, which compares the counting values of two input conditions.
1) Counter Present Value Change and Contact On/Off
(1) Increment Counter
• It should have Input condition (CU), reset condition (R) and setting value (PV).
t0+PT
t0
t1
t2 t3
t4
t5
t0
t1
t2
t2
t5
IN
Q
PT
ET
t2+PT
t4+PT
t4
t4
t0
Reset input
Up count output
Current value
Preset value
Up count pulse input