Control Using Profibus Dp; Bus Control Activation; Bus Control Limitation - Honeywell BCU 370 Technical Information

Parameters

4 . 7 Control using PROFIBUS DP

4 . 7 .1 Bus control activation

Parameter 31
Only on BCU 370..B1-3
Activates three-point step control via Profibus DP.
The activation signals for capacity control using the
butterfly valve can be transferred via the Profibus DP.
Once bit 7 of the output byte has been set, the valve
moves in the direction of the Closed position. When
bit 6 is set, the valve moves to the Open position. If both
bits are set, the valve stops. The BCU 370 displays fault
message 56 , "Open + Close set simultaneously".
The lower limit of the modulation range is defined using
parameter 32.
BCU 370 · Edition 01.19

4 . 7 .2 Bus control limitation

Parameter 32
Only on BCU 370..B1-3
Defines the lower limit of the modulation range of the
butterfly valve.
Parameter 32 = 0: when bit 7 is activated, the butterfly
valve moves to the Closed position. This is defined by
the limit switch in the actuator.
Parameter 32 = 2: when bit 7 is activated, the butterfly
valve moves to the Ignition position. This is defined by
the limit switch in the actuator.
r
25 26 27 28 29 30 31 32
▼
M
61