User`s manual

138
● You can use Operating condition settings batch-change command (Y01) to enable the setting of the cycle time.
Yet buffer memories for the data classification Md1, for example, CH1 Present value (Un\G1050, Un\G1051) are also
cleared by using Operating condition settings batch-change command (Y01). To avoid that, use CH1 Setting change
request (sampling counter/periodic pulse counter) (Un\G1020) instead.
● Depending on the pulse input speed and cycle time, the values stored in CH1 Periodic pulse count, difference value
(Un\G1058, Un\G1059) and CH1 Periodic pulse count value update check (Un\G1062, Un\G1063) might be over
2147483647 (upper limit value) or below -2147483648 (lower limit value).
In that case, the values in CH1 Periodic pulse count, difference value (Un\G1058, Un\G1059) and CH1 Periodic pulse
count value update check (Un\G1062, Un\G1063) remain 2147483647 (upper limit value) or -2147483648 (lower limit
value), and CH1 Overflow/underflow error (sampling count value/periodic pulse count, difference value) (warning code
1050) will be detected.
Despite of this warning, the periodic pulse counter function keeps working.
● Do not use CH1 Periodic pulse count value update flag (Un\G1077) and CH1 Periodic pulse count value update flag reset
command (Un\G1025) when retrieving CH1 Periodic pulse count, difference value (Un\G1058, Un\G1059), CH1 Periodic
pulse count, present value (Un\G1060, Un\G1061), and CH1 Periodic pulse count value update check (Un\G1062,
Un\G1063) via the auto refresh target device. (In case 1
H
: Updated is stored in CH1 Periodic pulse count value update
flag (Un\G1077) after the auto refresh is done, the updated values are not reflected to the auto refresh target device and
therefore, the values retrieved via the auto refresh target device are the ones before the updating.)
● To use CH1 Periodic pulse count value update flag (Un\G1077), reset it before executing the periodic pulse counter
function.
If you do not reset it, you cannot tell whether its value was updated after the execution.
● When changing the cycle time by using CH1 Setting change request (sampling counter/periodic pulse counter)
(Un\G1020), note the following:
Do not execute the periodic pulse counter function by the function input terminal (FUNC1) until the value in CH1 Setting
change request (sampling counter/periodic pulse counter) (Un\G1020) turns from 1
H
: Requested to 0
H
: Not requested.
If you do so, the function might work with the previous setting.
● When the periodic pulse counter function is used, the cycle time might slightly differs due to component error (±100ppm).
For details, refer to the Point described in the following clause:
Page 131, Section 4.6
Number Description
1)
The module starts counting input pulses from 0 at the rise of CH1 Selected counter function start command (Y07) or the
function input terminal (FUNC1).
2)
Every preset cycle time, the values in CH1 Present value (Un\G1050, Un\G1051) are stored in CH1 Periodic pulse count,
present value (Un\G1060, Un\G1061).
3)
Every preset cycle time, the difference of the count values between the previous one and the present one are stored in CH1
Periodic pulse count, difference value (Un\G1058, Un\G1059) and CH1 Periodic pulse count value update check (Un\G1062,
Un\G1063).
4)
When the periodic pulse counter function is working, 1
H
: Operating is stored in CH1 Sampling counter/periodic pulse counter
operation flag (Un\G1071).
5)
When CH1 Periodic pulse count, difference value (Un\G1058, Un\G1059), CH1 Periodic pulse count, present value
(Un\G1060, Un\G1061), and CH1 Periodic pulse count value update check (Un\G1062, Un\G1063) are updated, 1
H
: Updated
is stored in CH1 Periodic pulse count value update flag (Un\G1077).
6)
Reset CH1 Periodic pulse count value update flag (Un\G1077) to 0
H
: Not updated by setting CH1 Periodic pulse count value
update flag reset command (Un\G1025) to 1
H
: Reset.
CH1 Periodic pulse count value update flag reset command (Un\G1025) is automatically reset to 0
H
: Not reset after the
completion of the reset.
7) The periodic pulse counter function works regardless of CH1 Count enable command (Y06) status (ON or OFF).
8)
The periodic pulse counter function is stopped by turning off both CH1 Selected counter function start command (Y07) and the
function input terminal (FUNC1).