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FX2N-2LC Temperature Control Block
7.
Buffer Memory (BFM)
Each setting and alarm in the FX
buffer memories (hereafter referred to as "BFM").
Each BFM consists of 16 bits. Use FROM/TO instructions in the 16-bit format.
7.1
Buffer memory list
Table 7.1:
BFM No.
CH1 CH2
#0
Flag
#1
#2
Event
#3
#4
Measured value (PV)
#5
#6
Control output value (MV)
#7
#8
Heater current measured value
#9
Initialization command
#10
Error reset command
#11
Control start/stop changeover
#12
#21 Set value (SV)
#13
#22 Alarm 1 set value
#14
#23 Alarm 2 set value
#15
#24 Alarm 3 set value
#16
#25 Alarm 4 set value
Heater disconnection alarm set
#17
#26
value
#18
#27 Auto/manual mode changeover
#19
#28 Manual output set value
#20
#29 Auto tuning execution command
#30
Unit type code
#31
Prohibited
#32
#51 Operation mode
#33
#52 Proportional band
#34
#53 Integral time
#35
#54 Derivative time
-2LC is written from or read to the PLC main unit through
2N
Name
Error flag, ready flag, etc.
Alarm status, temperature rise
completed status, etc.
±5% of input range (°C/°F)
-5.0 to 105.0 (%)
0.0 to 105.0 (A)
0: Performs nothing
1: Initializes all data
2: Initializes BFM #10 to BFM #69
0: Performs nothing
1: Resets errors
0: Stops control
1: Starts control
Within set range limiter
Unit: °C or °F
Allowable set range varies
depending on alarm mode set-
ting.
0.0 to 100.0 A
(When "0.0" is set, alarm function
is disabled.)
0:AUTO
-5.0 to 105.0 (%) *1
0: Stops auto tuning
1: Performs auto tuning
2060
0: Monitor
1: Monitor + Temperature alarm
2: Monitor + Temperature alarm +
Control
0.0 to 1,000.0 %/span
(When "0.0" is set, two-position
control is performed.)
1 to 3,600 sec
0 to 3,600 sec
Description/set range
1:MAN
---
Buffer Memory (BFM) 7
Initial
Remarks
value
0
0
R
0.0
-5.0
0.0
---
0
0
0
0.0
0.0
0.0
R/W
0.0
0.0
0.0
0
0.0
0
R
---
---
---
2
R/W
3.0
240
60
7-1
7
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