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CHAPTER 4 DEVICES
4
4.2 Internal User Devices
4.2.5 Annunciator (F)
4.2.5 Annunciator (F)
The annunciator (F) is an internal relay that can be effectively used in fault detection programs for a user-created
system. When any annunciator turns on, SM62 turns on, and the number of annunciators turned on and the
corresponding numbers are stored in SD62 to SD79. The annunciator number stored in SD62 is also registered to the
error history area.
(1) 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.
(2) 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/special register Description
SM62 Turns on even if only one of the annunciator number areas is turned on.
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.)
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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