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10 EXPLANTION OF DEVICES
MELSEC-Q
10.2.5 Anunciators (F)
(1) Definition
(a) Anunciators are internal relays used for fault detection programs created by
the user.
(b) When anunciators switch ON, a special relay (SM62) switches ON, and the
Nos. and quantity of the anunciators which switched ON are stored at the
special registers (SD62 to SD79).
• Special relay :SM62.................... :Switches ON if even one anunciator
switches ON.
• Special register :SD62 .................... No. of first anunciator which switched
ON is stored here.
SD63 .................... The number (quantity) of anunciators
which are ON is stored here.
SD64 to SD79...... Anunciator Nos. are stored in the order
in which they switched ON.
(The same anunciator No. is stored at
SD62 and SD64.)
The anunciator No. stored at SD62 is also registered in the "fault history
area".
(c)
Using annunciators for a fault detection program, an equipment fault or fault
presence/absence (annunciator number) can be checked by monitoring the
special register (SD62 to SD79) when the special relay (SM62) switches
ON.
Example
The program which outputs the No. of the ON annunciator (F5) is shown below.
[Fault detection program]
X0
X10
SET
F5
SM62
BCDP SD62 K4Y20
Output of annunciator
No. which switched ON
SM62
SD62
SD63
SD64
SD65
SD79
OFF to ON
0 to 5
0 to 1
0 to 5
0
0
Annunciator ON detection
10 - 12
10 - 12