Annunciator (F) - Mitsubishi Q00JCPU User Manual

10
DEVICE EXPLANATION

10.2.5 Annunciator (F)

(1) Definition
(2) Special relay and special registers at annunciator ON
(3) Applications of annunciators
(4) Number of used N/O and N/C contacts
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- 17 10.2 Internal User Devices
10.2.5 Annunciator (F)
Annunciators are internal relays used for fault detection programs created by the user.
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).
• Special relay : SM62
• Special register : SD62
SD63
SD64 to 79 • • •
The annunciator No. stored at SD62 is also registered in the "error history strage
area".
POINT
For the Basic model QCPU, only one annunciator No. is stored into the error
history strage area while the PLC power is ON.
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.
Example
The program which outputs the No. of the ON annunciator (F5).
[Fault detection program]
X0 X10
SM62
Output of annunciator
No. which switched ON
Annunciator ON detection
Figure 10.11 Detection and storage of annunciator ON
There are no restrictions on the number of contacts (N/O contacts, NC contacts) used
in the program, provided the program capacity is not exceeded.
• • • • • Switches ON if even one annunciator switches ON.
• • • • • No. of first annunciator which switched ON is stored
here.
• • • • • The number (quantity) of annunciators which are
ON is stored here.
Annunciator Nos. are stored in the order in which
they switched ON.
(The same annunciator No. is stored at SD62 and
SD64.)
SET F5
BCDP SD62 K4Y20
SM62
OFF to ON
SD62
0 to 5
SD63
0 to 1
SD64
0 to 5
SD65
0
SD79
0