Anunciators (F) - Mitsubishi Electric MELSEC-Q Series User Manual

10 DEVICES

10.2.5 Anunciators (F)

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(1) Definition
(a) Anunciators are internal relays used by the user in fault detection program.
(b) When anunciators switch ON, a special relay (SM62) switches ON, and the
Nos. and quantity of anunciators which switched ON are stored at the
special registers (SD62 to SD79).
At this time, the "ERR." LED is lit.
• Special relay :SM62.................... Switches ON if even one anunciator
• Special register:SD62 ................... No. of first anunciator which switched
The anunciator No. stored at SD62 is also registered in the "fault history
area".
However, only one annunciator number is stored into the failure history
storage area while the PLC power is ON.
(c) The use of anunciators in the fault detection program permits the user to
check for the presence/absence of fault and to check the fault content
(anunciator No.), by monitoring the special registers(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
SM62
Output of annunciator
No. which switched ON
Annunciator ON detection
switches ON.
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.)
SET F5
BCDP
SD62 K4Y20
MELSEC-Q
SM62 OFF to ON
SD62 0 to 5
SD63 0 to 1
SD64 0 to 5
SD65
0
SD79
0
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