Mitsubishi Electric MELSEC FX2N-2LC, Руководство пользователя

Страница: 77 / 100

FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7
7-23
7
7.2.34 BFM #72 to BFM #75: Alarm mode setting
The FX
2N
-2LC is equipped with 14 types of alarms. Among them, up to 4 types can be used in
accordance with the application.
Write the alarm No. used in Alarm 1 to BFM #72.
Write the alarm No. used in Alarm 2 to BFM #73.
Write the alarm No. used in Alarm 3 to BFM #74.
Write the alarm No. used in Alarm 4 to BFM #75.
The alarm modes set here are applied to both channels.
However, the set value of each alarm can be set for each channel, and the alarm result can be
obtained for each channel also.
(CH1 set value: BFM #13 to BFM #16, CH2 set value: BFM #22 to BFM #25
CH1 alarm result: BFM #1 b4 to b8, CH2 alarm result: BFM #2 b4 to b8)
Or a same alarm type can be set to two or more BFM Nos.
The initial value is "0 (alarm function OFF)". For the details, refer to Section 6.
Table 7.8:
Alarm
No.
Alarm type Description
Set
range
0 Alarm function OFF Alarm function is disabled. ---
1 Upper limit input value alarm
When measured value (PV) is more than alarm set
value, an alarm is issued. Input
range
2 Lower limit input value alarm
When measured value (PV) is less than alarm set
value, an alarm is issued. Input
range
3 Upper limit deviation alarm
When deviation (= Measured value (PV) - Set
value (SV)) is more than alarm set value, an alarm
is issued.
±Input
width
4 Lower limit deviation alarm
When deviation (= Measured value (PV) - Set
value (SV)) is less than alarm set value, an alarm
is issued.
±Input
width
5 Upper/lower limit deviation
When absolute deviation (=

Measured value (PV)
- Set value (SV)

) is more than alarm set value, an
alarm is issued.
+Input
width
6 Range alarm
When absolute deviation (=

Measured value (PV)
- Set value (SV)

) is less than alarm set value, an
alarm is issued.
+Input
width
7
Upper limit input value alarm
with wait
When measured value (PV) is more than alarm set
value, an alarm is issued. However, when power is
turned on, measured value is ignored.
Input
range
8
Lower limit input value alarm
with wait
When measured value (PV) is less than alarm set
value, an alarm is issued. However, when power is
turned on, measured value is ignored.
Input
range
9
Upper limit deviation value
alarm with wait
When deviation (= Measured value (PV) - Set
value (SV)) is more than alarm set value, an alarm
is issued. However, when power is turned on,
measured value is ignored.
±Input
width
10
Lower limit deviation value
alarm with wait
When deviation (= Measured value (PV) - Set
value (SV)) is less than alarm set value, an alarm
is issued. However, when power is turned on,
measured value ignored.
±Input
width