Honeywell Krom Schroder BCU 580 Technical Information page 43

Profinet
"Inputs/outputs" module – slot 1
The digital input and output signals from the burner
control units BCU 560, BCU 565 and BCU 580 are in-
cluded in this module.
Input bytes (device ➔ controller)
The input bytes describe the digital signals which are
transferred from the BCU (IO device) to the digital in-
puts of the PLC (IO controller). The digital signals take
up 2 bytes (16 bits).
Bit Byte n Byte n+1
Burner 1 Max. capacity
0
operating signal reached1)
Burner 2 Min. capacity
1
operating signal reached
2
BCU system fault Air ON
3
Fault lock-out Pre-purge ON
4
Safety shut-down DI ON
Ready for
5 Warning
operation
Burner 2 flame
6 ON
signal
Burner 1 flame
7 Manual mode
signal
1) Only with three-point step control via bus.
BCU 580 · Edition 11.15l
Byte n+2
menox ON
Free
1)
Free
Free
Free
Free
Free
Free
Output byte (controller ➔ device)
The output byte describes the digital signals which are
output by the PLC (IO controller) to the BCU (IO device).
The digital signals to control the burner control unit
BCU occupy 1 byte (8 bits).
Parallel to the bus communication, terminals 1 to 4, 44
and 50 of the BCU can be wired. This allows the BCU to
be controlled using the digital signals of the bus com-
munication or the inputs at the terminals.
In the event that the bus communication is faulty or
Format
interrupted and during the initialization of the bus com-
BOOL
munication after switching on, the digital signals are
interpreted as "0". If the BCU is controlled using the
BOOL
inputs at the terminals during this time, the normal pro-
BOOL
gram runs even if the bus communication is faulty or
BOOL
interrupted.
BOOL
BOOL Bit Byte n
0 Reset 1)
BOOL
1 Burner 1 start
2 External air ON
BOOL
3 Pre-purge ON
4 Burner 2 start
5 menox ON
6 Open control element, three-point step Open
7 Close control element, three-point step Close
1)
Parallel to the bus communication, terminals 1 to 4 can be wired.
2) Only with three-point step control via bus.
▼
1)
1)
1)
2)
2)
Format
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
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