BCU 370 · Edition 01.19 79
Annex
12 Annex
12.1 Status and fault messages for PROFIBUS DP
This table can be used to program the master.
Input bytes (BCU ➔ master)
Byte 2 Byte 0, Bit 2 = 0 (Status message) Byte 0, Bit 2 = 1 (Fault message)
0 0 Start-up position/standby
1 A0 Valve moves to Closed position 01 Flame simulation
2 01 Fan run up time
3 A1 Butterfly valve moves to Open position
4 P1 Pre-purge time 04 Start-up without flame signal
5 A2 Butterfly valve moves to Ignition position 05 Flame failure during 1
st
flame proving period
6 03 Pre-ignition time 06 Flame failure during 2
nd
safety time
7 04 1
st
safety time on start-up 07 Flame failure during 2
nd
flame proving period
8 05 1
st
flame proving period 08 Flame failure during operation
9 06 2
nd
safety time on start-up
10 07 2
nd
flame proving period d0 Fault Air monitor break contact check
11 08 Controller enable signal d1 Fault Air monitor make contact check
12 P9 Post-purge time d2 Fault Air supply while butterfly valve moves to Ignition position
13 d3 Fault Air supply during pre-ignition time
14 d4 Fault Air supply during 1
st
safety time on start-up
15 d5 Fault Air supply during 1
st
flame proving period
16 d6 Fault Air supply during 2
nd
safety time on start-up
17 d7 Fault Air supply during 2
nd
flame proving period
18 d8 Fault Air supply during operation
19 dP Fault Air supply during pre-purge time
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