Profibus Dp; Safety-Related Control Signals - Honeywell BCU 370 Technical Information

Function
BCU 370 · Edition 01.19
L1, N, PE
DI P
SPS
PLC
API

PROFIBUS DP

BCU..B
1– 6 BUS
1
BCU..B
1– 6 BUS
2
BCU..B
1– 6 BUS
3
3 .4 PROFIBUS DP
The BCU..B1 features the same functions and perfor-
mance of a BCU ® without a PROFIBUS connection.
PROFIBUS is a manufacturer-independent, open field-
bus standard for diverse applications.
PROFIBUS DP is a bus variant for communication be-
tween automation systems and distributed peripherals
at the field level, optimized for speed and low connec-
tion costs.
On PROFIBUS DP, the individual bus subscribers are
connected via a 2-core shielded cable as standard.
The bus system transfers the control signals for start-
ing, resetting and for controlling the air valve to purge
the furnace or kiln or for cooling in start-up position
and heating during operation from the control system
(PLC) to the BCU..B1. In the opposite direction, it sends
operating status, the level of the flame signal and the
current program status.

3 .4 .1 Safety-related control signals

Signals from the safety interlocks and digital input are
transferred independently of the bus communication
by separate cables. The air valve used to purge the fur-
nace or kiln can either be activated via the PROFIBUS
or via a separate cable to terminal 22. The purging pro-
cess must be monitored by further measures, e.g. flow
monitoring.
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