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5.3 Using the Counter Value Comparison Function
5.3.4 Coincidence detection interrupt function
5
FUNCTIONS
5.3.4 Coincidence detection interrupt function
Use the coincidence detection interrupt function to request an interrupt to the
programmable controller CPU when a coincidence is detected, and start up the interrupt
program.
(a) Up to 16-point interrupt factors (SI) are allowed for a single MELSEC-Q series
intelligent function module.
As shown in Table 5.9, the QD64D2 has 4-point interrupt factors (SI) for
coincidence detection.
Figure 5.10 Timing of interrupt signal generation
(b) It takes approximately 150 s from when the QD64D2 detects a coincidence until
it requests an interrupt to the programmable controller CPU.
(c) Select [PLC parameter] - [PLC system] - [Intelligent function module setting] -
[Interrupt pointer settings] to set the interrupt factors (SI) of the QD64D2 and
interrupt pointers of the programmable controller CPU.
1) [PLC side] [Interrupt pointer start No.]
Set the start interrupt pointer number of the programmable controller CPU.
Setting range: 50 to 255
Table 5.9 List of interrupt factors
SI No. Interrupt factor
0
Channel 1: Coincidence detection of coincidence output No.1 point setting or continuous
comparison No.1 point m setting
1
Channel 1: Coincidence detection of coincidence output No.2 point setting or continuous
comparison No.2 point m setting
2
Channel 2: Coincidence detection of coincidence output No.1 point setting or continuous
comparison No.1 point m setting
3
Channel 2: Coincidence detection of coincidence output No.2 point setting or continuous
comparison No.2 point m setting
4 to 15 Reserved
*1
Timing of interrupt signal generation
I/O signals
Counter value
coincidence No.1
(X02)
Coincidence signal
No.1 reset command
(Y01)
Internal processing
of the programmable
controller CPU
Interrupt request
Interrupt request clear
Program processing in the
programmable controller CPU
Interrupt program processing
*1 The coincidence signal No.1 reset command (Y01) is only used for the coincidence output function.
For the continuous comparison function, the counter value coincidence No.1 (X02) automatically
turns OFF after elapsing the set time of the continuous comparison No.1 ON time setting (Un\G52).