Bronkhorst Multibus - Manual (Page 18)

BRONKHORST ®
Page 18 Operational instructions for digital multibus instruments 9.17.023
4.8 S
ETPOINT SLOPE
unsigned int 0…30000 RW N 10 1/2
Digital instruments can establish a smooth setpoint control using the setpoint slope time. The setpoint will be linear
increased in time from old setpoint to new setpoint value. A value between 0 and 3000 seconds, with a resolution of
0.1 seconds, can be given to set the time for the integrator on the setpoint signal.
Setpoint will reach its end value after:
= • 




 −
slope
100
oldsp newsp
seconds
Sample; When slope = 10 seconds how long will it take to go from 20% to 80%?
6 10
100%
20% 80%
= • 




 −
seconds
4.9 A
NALOG INPUT
unsigned int 0…65535 R N 11 1/3
Depending on the analog mode, 0...5Vdc / 0…10Vdc / 0...20mA / 4...20mA is converted to 0…32000.
Analog input signals (digitized) are in the same range as measured values (0...32000 = 0...100%).
This input can be used to give setpoint or slave factor, depending on the value of control mode.
4.10 C
ONTROL MODE
unsigned char 0…255 RW N 12 1/4
For switching between different functions of a digital meter or controller several modes are available.
Mode Instrument action Setpoint source Master source Slave factor
0 BUS/RS232 Controlling BUS/RS232
1 Analog input Controlling analog input
2 FLOW-BUS slave
controlling as slave from other
instrument on the bus
FLOW-BUS * slave
factor /100%
FLOW-BUS
slave factor
(proc33,par 1)
3 Valve close close valve
4 Controller idle
stand-by on BUS/RS232
controlling is stopped / Valve Out
freezes in current position
5 Testing mode testing enabled (factory only)
6 Tuning mode tuning enabled (factory only)
7 Setpoint 100% controlling on 100% 100%
8 Valve fully open purge valve
9 Calibration mode calibration enabled (factory only)
10 Analog slave
controlling as slave from other
instrument on analog input
Analog input * slave
factor /100%
analog input
proc33,par 1
(slave factor)
12 setpoint 0% controlling on 0% 0%
13 FLOW-BUS analog slave
controlling as slave from other
instrument on bus, slave factor is set
with signal on analog input
FLOW-BUS * analog
input * slave factor
/100%
FLOW-BUS *
analog input
analog input
18 RS232 Controlling
20 valve stearing
(valve = setpoint)
Setpoint is redirected directly to
Valve Out with the controller idle
21 analog valve stearing
(valve = analog input)
Analog input is redirected directly to
Valve Out with the controller idle
22 valve safe state See parameter Valve Safe State
Analog input= external input= pin 3 on DB 9 connector.
BUS = any available field bus
At power-up the control mode will be set by the jumper or dip switch setting on the PC-board of the instrument (only
for the control mode values 0, 1, 9 or 18). If the actual control mode is not equal to 0, 1, 9 or 18, it will not be
overruled by jumper or dip switch setting on the PC-board of the instrument. For more information see parameter
IOStatus.