Mitsubishi Electric MELSEC FX3U Programming Manual page 98

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
3. Annunciator type
Annunciator type state relays can be used as outputs for external fault diagnosis.
For example, when an external fault diagnosis circuit shown in the figure below is created and the contents of
the special data register D8049 are monitored, the smallest number out of the active state relays S900 to
S999 is stored in D8049.
If two or more faults have occurred, the smallest state number having a fault is displayed at first. When the
fault is cleared, the next smallest state number having a fault is stored.
M8000
RUN monitor
Y000 X000
X001 X002
X003 X004
M8048
X005
While the special auxiliary relay M8049 is not driven, annunciator type state relays can be used as latched
(battery backed) type state relays in sequence programs in the same way as general type state relays.
In the SFC programming mode in the FX-PCS/WIN(-E), however, S900 to S999 cannot be programmed as a
processes flow in SFC diagrams.
96
M8049
FNC 46
T 0 K 10 S900
ANS
FNC 46
T 1 K 20 S901
ANS
FNC 46
T 2 K100 S902
ANS
Y010
FNC 47
ANRP
•
When the special auxiliary relay M8049 is driven,
monitoring becomes valid.
•
If the forward end detection input X000 is not
activated within 1 second after the forward output
Y000 is driven, S900 is activated.
•
If both the upper limit detection input X001 and the
lower limit detection input X002 are deactivated at the
same time for 2 seconds or more, S901 is activated.
•
In a machine whose tact time is less than 10 seconds,
if the switch X004 which is designed to be activated
during one-cycle operation of the machine is not
activated while the continuous operation mode input
X003 is ON, S902 is activated.
•
When any annunciator among S900 to S999 turns
ON, the special auxiliary relay M8048 is activated and
the fault display output Y010 is activated.
•
The state relays activated by the external fault
diagnosis program can be turned OFF by the reset
button X005.
Every time X005 is set to ON, the active annunciator
with the smallest number is reset in turn.
4 Devices in Detail
4.4 State Relay [S]