96
*1
For
Δ
T
1
, refer to Page 283, Appendix 4.
(2) Overflow error and underflow error
• When "0: Linear Counter" is selected for "CH
Counter format", the underflow error occurs at counting down
from -2147483648 (lower limit value) in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) and the
overflow error occurs at counting up from 2147483647 (upper limit value).
• If the overflow error occurs, CH
Overflow detection flag (RWr20.b2, RWr38.b2) is set to Detected (1) and
CH
Overflow/underflow error (error code:
200
H
) is stored in CH
Latest error code (RWr22, RWr3A).
Then, the counting stops. The value in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) does not
change from 2147483647 even when pulses are input.
• If the underflow error occurs, CH
Underflow detection flag (RWr20.b1, RWr38.b1) is set to Detected (1)
and CH
Overflow/underflow error (error code:
200
H
) is stored in CH
Latest error code (RWr22,
RWr3A). Then, the counting stops. The value in CH
Present value (RWr10 to RWr11, RWr28 to RWr29)
does not change from -2147483648 even when pulses are input.
• An overflow and underflow error is cleared by the preset/replace function. After CH
Overflow detection flag
(RWr20.b2, RWr38.b2) and CH
Underflow detection flag (RWr20.b1, RWr38.b1) are set to Not detected
(0), the counting resumes. Though, CH
Latest error code (RWr22, RWr3A) is held until it is reset. Reset
CH
Latest error code (RWr22, RWr3A) by CH
Error reset command (RY36, RY4E).
No.
Description
1)
For counting down from the lower limit value (-2147483648) in CH
Present value (RWr10 to RWr11, RWr28 to RWr29), the
underflow error occurs and CH
Underflow detection flag (RWr20.b1, RWr38.b1) is changed to Detected (1) from Not detected (0).
For details on the underflow error, refer to the following.
2)
When CH
Preset/replace command (RY21, RY39) is turned off then on to clear the underflow error, the value in CH
Preset
value setting (RWw14 to RWw15, RWw2C to RWw2D) is stored in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) and
CH
Underflow detection flag (RWr20.b1, RWr38.b1) is changed to Not detected (0) from Detected (1) .
Counting in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) resumes.
3)
For counting up from the upper limit value (2147483647) in CH
Present value (RWr10 to RWr11, RWr28 to RWr29), the overflow
error occurs and CH
Overflow detection flag (RWr20.b2, RWr38.b2) is changed to Detected (1) from Not detected (0).
For details on the overflow error, refer to the following.
4)
When CH
Preset/replace command (RY21, RY39) is turned off then on to clear the overflow error, the value in CH
Preset value
setting (RWw14 to RWw15, RWw2C to RWw2D) is stored in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) and CH
Overflow detection flag (RWr20.b2, RWr38.b2) is changed to Not detected (0) from Detected (1).
Counting in CH
Present value (RWr10 to RWr11, RWr28 to RWr29) resumes.
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