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Fieldbus communication
Inputs/Outputs
The digital input and output signals from the burner
control unit BCU are included in this module.
Input bytes (BCU ➔ PLC)
The input bytes describe the digital signals which are
transferred from the BCU to the digital inputs of the
PLC. The digital signals take up 3 bytes (24 bits).
Bit Byte n
Burner 1 operating
0
signal
Burner 2 operating
1
signal
2
BCU system fault
3
Fault lock-out
4
Safety shut-down
5
Warning
6
ON
7
Manual mode
Output bytes (PLC ➔ BCU)
The output bytes describe the digital signals which
are output by the PLC to the BCU. The digital signals
to control the burner control unit BCU occupy 2 bytes
(16 bits).
Terminals 1 to 41 (dependent on parameters I061 to
I074) can be wired parallel to the bus communication.
This allows the BCU to be controlled using the digital
signals of the bus communication or the inputs at the
terminals.
BCU 460, BCU 465 · Edition 11.19
Byte n+1
Byte n+2
Flameless
Free
operation
Free
Free
Air ON
Free
Pre-purge ON
Free
HT ON
Free
Ready for
Free
operation
Burner 1 flame
Free
signal
Burner 2 flame
Free
signal
Bit Byte n
0
Reset
1)
1
Burner 1 start
2
External air ON
3
Pre-purge ON
4
Burner 2 start
5
Flameless mode ON
6
Free
7
Free
Format
1) Terminals 1 to 41 (dependent on parameters I061 to I074) can
be wired parallel to the bus communication.
BOOL
2) Only with BCU 465 depending on the parameter settings.
BOOL
▼
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
Byte n+1
Auxiliary gas
1)
Optional output
1)
Cooling air valve
Free
1)
Free
2)
Free
Free
Free
Format
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
54
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