Mitsubishi MELSEC QS Series, Руководство пользователя

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9
DEVICE EXPLANATION
9.2 Internal User Devices
9.2.4 Annunciator (F)
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9.2.4 Annunciator (F)
(1) Definition
Annunciators are internal relays used for fault detection programs created by the user.
(2) Special relay and special registers at annunciator ON
When annunciators switch ON, a special relay (SM62) switches ON, and the Nos. and
quantity of the annunciators which switched ON are stored at the special registers
(SD62 to 79).
Annunciator numbers stored in SD62 are also recorded in the operation
•
error history
storage area.
POINT
Even if multiple annunciators are switched ON while the PLC is power-on, only
one annunciator number is stored in the operation
•
error history storage area.
When an error is ended on a CPU module, the other annunciator numbers that
are ON can be stored in the error history storage area.
(3) Applications of annunciators
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 79) when the special relay (SM62) switches ON.
• Special relay : SM62 • • • • • Switches ON if even one annunciator switches ON.
• Special register : SD62 • • • • • No. of first annunciator which switched ON is stored
here.
SD63 • • • • • The number (quantity) of annunciators which are
ON is stored here.
SD64 to 79 • • • Annunciator Nos. are stored in the order in which
they switched ON.
(The same annunciator No. is stored at SD62 and
SD64.)
Example
The program which outputs the No. of the ON annunciator (F5).
Diagram 9.10 Detection and storage of annunciator ON
SD62 BCDP
SM62
SET F5
K4X120
X100 X102
SM62
SD62
SD63
SD64
SD65
SD79
0
0
[Fault detection program]
Output of annunciator
No. which switched ON
Annunciator ON detection
OFF to ON
0 to 5
0 to 1
0 to 5