BCU 370 · Edition 01.19 61
Parameters
4.7 Control using PROFIBUS DP
4.7.1 Bus control activation
Parameter 31
Only on BCU 370..B13
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.
4.7. 2 Bus control limitation
Parameter 32
Only on BCU 370..B13
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
90° ➔ 0
0 ➔ 90°
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