Mitsubishi Electric MELSECQ Series User Manual page 36

3
SPECIFICATIONS
3
- 14
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(5) Present value A (Un\G10 and 11) and present value B (Un\G200 and 201)
• The present counter value is stored in this area.
• Select the present value A (Un\G10 and 11) to read such as the present value
and overflow detection flag (Un\G12) for each channel, and select the present
value B (Un\G200 and 201) to read the present values of multiple channels at a
time. Set the storage location (present value A/present value B) with the
intelligent function module switch. (Refer to Section 4.5.)
• The range of a value to be read is from -2147483648 to 2147483647 (32-bit
signed binary).
A
B
Count enable command
(Y04)
Present value A
(Un\G10 and 11)
Figure 3.5 Timing chart for the present value A (Un\G10 and 11)
(6) Overflow detection flag (Un\G12)
• Overflow occurrence status is stored in this area when the counter format is the
linear counter (refer to Section 5.2.2).
• According to the overflow occurrence status, 0 (No detection) or 1 (Overflow
occurred) is stored to the overflow detection flag (Un\G12).
• This flag operates as follows. (when the pulse input mode is 1 multiple of 1
phase)
A
B
Present value A
(Un\G10 and 11)
Overflow detection flag
(Un\G12)
Preset value setting
(Un\G4 and 5)
Preset command
(Y02)
Error code
(Un\G20)
Figure 3.6 Timing chart for the overflow detection flag (Un\G12)
3.4 Buffer Memory Assignment
3.4.2 Details of the buffer memory
search engine
ON
0
Performed by the QD63P6.
2147483646 2147483647
0 1
0
0
1 2
0 1
0
ON
100