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(5) Turning on the annunciator and processing
(a) Turning on the annunciator
The following instructions can be used.
1) SET F instruction
The SET F instruction can be used to turn on the annunciator only on the leading edge (off to on)
of an input condition.
Even if the input condition turns off, the annunciator is held on.
Using many annunciator numbers can shorten scan time more than using the
OUT F instruction.
2) OUT F instruction
The OUT F instruction can be also used to turn on or off the annunciator. However, since the
processing is performed for every scan, the scan time is longer than the case of using the SET F
instruction.
In addition, execution of the RST F , LEDR, or BKRST instruction is required after the annunciator is turned
off with the OUT F instruction.
Therefore, use of the SET F instruction is recommended.
If the annunciator is turned on with any instruction other than SET F and OUT F (for example, the MOV instruction), the
same operation as the internal relay (M) is performed.
The ON information is not stored in SM62, and annunciator numbers are not stored in SD62 and SD64 to SD79.
(b) Processing after annunciator on
1) Data stored in the special register (SD62 to SD79)
• Turned-on annunciator numbers are stored in SD64 to SD79 in order.
• The annunciator number in SD64 is stored in SD62.
•
SD63 value is incremented by "1".
2) Processing on the CPU
The USER LED on the front side turns on (red).
3) On/off setting for the LED
Whether to turn on the USER.LED or not when the annunciator is turned on can be set in the LED indication
setting. ( Section 6.21.2).
Figure 9.12 Processing after annunciator ON
0
0
0
0
0
0
0
SD62
SD63
SD64
SD65
SD66
SD67
SD79
50
1
50
0
0
0
0
50
2
50
25
0
0
0
50
3
50
25
1023
0
0
SET F50 SET F25 SET F1023
Up to 16 annunciator
numbers can be stored.