Diagnostic - Mitsubishi Electric MELSEC FX2N-2LC User Manual

Temperature control block
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FX2N-2LC Temperature Control Block
9.

Diagnostic

By reading the flags (BFM #0) and the events (BFM #1 and BFM #2) using FROM instructions,
you can confirm errors (such as lack of the driving power supply 24 V, heater disconnection
and loop breaking) which can be recognized by the FX
Table 9.1: Flags (BFM #0) indicating errors
Bit No.
b0
Error present
b1
Set value range error
24 VDC power supply
b2
error
b3
Set value backup error
· ·
·
Sum check error for
b8
adjustment data error
Cold contact temperature
b9
compensation data error
b10
A/D converted value error
Events (BFM #1 and BFM #2) indicating errors
Table 9.2: Events (BFM #1 and BFM #2) indicating errors
Bit No.
b0
Input error (upper limit)
b1
Input error (lower limit)
Cold contact temperature
b2
compensation data error
b3
A/D converted value error
b4
Alarm 1
b5
Alarm 2
b6
Alarm 3
b7
Alarm 4
b8
Loop breaking alarm
Heater disconnection
b9
alarm
b10
Heater meltdown alarm
When an error above has occurred, the contents described in the corresponding "Description"
column may be causes.
Eliminate causes of errors, then reset all errors using BFM #10.
If causes of an error remain, the corresponding bit turns on again.
Description
Turns on when an error among b1 to b10 below has occurred.
Turns on when data outside set range is written.
Turns on when driving power supply (24 VDC) is not supplied.
Turns on when an error has been caused by noise or when a fail-
ure has occurred in FX
If contents of error are not eliminated even after power is turned
off once then on again, contact Mitsubishi Electric System Ser-
vice.
· ·
·
Turns on when an error has been caused by noise or when a fail-
ure has occurred in FX
If contents of error are not eliminated even after power is turned
off once then on again, contact Mitsubishi Electric System Ser-
vice.
Assignment
Turns on when input value is over scale.
Turns on when input value is under scale.
Turns on when an error has been caused by noise or when a fail-
ure has occurred in FX
If contents of error are not eliminated even after power is turned
off once then on again, contact Mitsubishi Electric System Ser-
vice.
Turns on when an alarm has occurred.
Turns on when an alarm has occurred.
Turns on when an alarm has occurred.
Turns on when an alarm has occurred.
Turns on when a loop breaking alarm has occurred.
Turns on when a heater disconnection alarm has occurred.
Turns on when a heater meltdown alarm has occurred.
-2LC.
2N
Operation
-2LC.
2N
· ·
·
-2LC.
2N
Description
-2LC.
2N
Diagnostic 9
9
9-1

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