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CHAPTER9 DEVICES
9
9.2 Internal User Devices
9.2.5 Annunciator (F)
9.2.5 Annunciator (F)
(1) Definition
The annunciator (F) is an internal relay which can be effectively used in fault detection programs for user-created
system.
(2) Special relay and special register after annunciator ON
When the annunciator is turned on, the special relay (SM62) is set to on, and the numbers and quantity of the
annunciator numbers are stored in the special register (SD62 to SD79).
The annunciator number stored in SD62 is also registered in the error history area.
For the Basic model QCPU, one annunciator number only is stored in the error history area while the programmable
controller is powered on.
(3) Applications of the annunciator
Using the annunciator in a fault detection program allows check for a system fault and identification of the fault
(annunciator number) by monitoring the special register (SD62 to SD79) when the special relay (SM62) turns on.
In this program, when annunciator (F5) is turned on, the corresponding annunciator number is output
to the outside.
(4) Allowable number of normally open or closed contacts
There are no restrictions on the number of normally open or closed contacts used in a program, as long as the
program capacity is not exceeded.
• Special relay : SM62 Turns on even if only one of the annunciator number areas is
turned on.
• Special register : SD62
Stores the number of the annunciator that was turned on first.
SD63
Stores the quantity of the annunciator number areas that are on.
SD64 to SD79 Stores annunciator numbers in the order of turning on.
(The same annunciator number is stored in SD62 and SD64.)
Figure 9.11 Detecting and saving the annunciator ON
SD62
BCDP
SM62
SET
F5
K4Y20
X0 X10
SM62
SD62
SD63
SD64
SD65
SD79
0
0
[Fault detection program]
Outputs No. of the
annunciator that turned on.
Annunciator ON detection
OFF ON
0 5
0 1
0 5
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