Bronkhorst Multibus Manual do Utilizador descarregar pdf (Página 18)

BRONKHORST®

Page 18 Operational instructions for digital multibus instruments 9.17.023

4.8 S

ETPOINT SLOPE

unsigned int

0…30000

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

oldspnewsp

seconds

Sample; When slope = 10 seconds how long will it take to go from 20% to 80%?

610

100%

20%80%

=•













−

seconds

4.9 ANALOG INPUT

unsigned int

0…65535

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 CONTROL MODE

unsigned char

0…255

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

BUS/RS232

Controlling

BUS/RS232

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)

Valve close

close valve

4 Controller idle

stand-by on BUS/RS232

controlling is stopped / Valve Out

freezes in current position

Testing mode

testing enabled (factory only)

Tuning mode

tuning enabled (factory only)

Setpoint 100%

controlling on 100%

100%

Valve fully open

purge valve

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)

setpoint 0%

controlling on 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

RS232

Controlling

valve stearing

(valve = setpoint)

Setpoint is redirected directly to

Valve Out with the controller idle

analog valve stearing

(valve = analog input)

Analog input is redirected directly to

Valve Out with the controller idle

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.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 49 50

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