Ring Counter Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Ring counter function

This function repeatedly counts the input pulses from 0 to 99999999.
99999999
0
'CH1 Count enable'
(Y18)
'CH1 Carry over detection
flag' (Un\G7)
'CH1 Carry over reset
request' (Un\G387)
Performed by the pulse input module
Cv: Accumulating count value
t: Time
No. Operation
(1) When 'CH1 Accumulating count value' (Un\G2, Un\G3) exceeds 99999999, Carry over detection (1) is stored in 'CH1 Carry over detection flag'
(Un\G7). Count operation continues.
(2) Setting 'CH1 Carry over reset request' (Un\G387) to Reset request (1) causes No carry over detection (0) to be stored in 'CH1 Carry over detection
flag' (Un\G7).
(3) After the carry over is reset, when 'CH1 Accumulating count value' (Un\G2, Un\G3) exceeds 99999999 again, Carry over detection (1) is stored in
'CH1 Carry over detection flag' (Un\G7).
• 'CH1 Carry over detection flag' (Un\G7) is not cleared until 'CH1 Carry over reset request' (Un\G387) is set
to Reset request (1). After 'CH1 Carry over detection flag' (Un\G7) is cleared, it will not be set to Carry over
detection (1) until 'CH1 Accumulating count value' (Un\G2, Un\G3) exceeds 99999999 again.
• Carry over detection is collected on the CPU module as the event history. ( Page 39 Event History
Function)
Setting method
1.
Set "Linear counter/ring counter selection" to "Ring counter".
[Navigation window]  [Parameter]  [Module Information]  Module model name  [Basic setting]  [Linear counter/
ring counter selection]
1 FUNCTIONS
22
1.3 Count Type Selection
Cv
ON
OFF
No carry over detection (0)
No reset request (0)
(1)
No carry over
detection (0)
Carry over
detection (1)
(2)
Reset request (1)
t
(3)
Carry over
detection (1)
No reset
request (0)