Bronkhorst Multibus User Manual

Page 37

BRONKHORST

Page 37

Operational instructions for digital multibus instruments

9.17.023

Flatconductor

cable

main PC board

fieldbus

interface

off

9.4.1 Examples of using parameter IOstatus

•

When the analog jumper is set the value of parameter 86 will read: 1+2+4+8+64 = 79

•

To disable the micro switch bit 3 must be false, value of parameter 86 must be set to.: 1+2+4 = 7

•

To disable the analog jumper bit 2 must be false, value of parameter 86 must be set to: 1+2+8= 11

Bit 2 = 0 (don't read ‘analog jumper’)

At power-on of an instrument the jumper will not be read.

The control mode will remain on the value as it was before power-off.

Only when the control mode before power-off is set to the value 5, 9, 18 or 19 the control mode will switch to 0 (digital).

Bit 2 = 1 (read ‘analog jumper’)

At power-on of an instrument the jumper will be read.

Only when the control mode before power-off is set to the value 0, 1, 5, 9, 18 or 19 the control mode will switch to:
-

0 (digital) when jumper 2 is not placed.

1 (analog input) when jumper 2 is placed.

9.4.2 Examples of using real jumpers (MBC-I and MBC-II

type)

In normal operation it is not necessary to change the jumper

setting. If it cannot be avoided, the jumpers can be reached by

removing the uppercase of the housing. Opening the uppercase

should be done with great care, because the connection of the

field bus and main p.c. board is accomplished by a small flat

conductor cable.

Each jumper or switch can be used to make a certain setting

by placing a link between a set of pins or by switching one of

the DIP-switches as shown below:

with DIP switch

Switch Jumper IOstatus

bit

When placed

(on)

When not placed

(off)

Remarks

Default settings from

EPROM loaded at

power-up

Settings loaded from

non-volatile memory at

power-up

If S2 is placed all settings are

erased, including factory

calibration.

Analog input used as

standard setpoint for

controller at power-up

Digital (bus) input used

as standard setpoint for

controller at power-up

Setting depends on how instrument was

ordered. Setting can be changed during

normal operation using parameter “Control

Mode”. At next power-up however, controller

will read jumper first for setpoint source.

reserved

Not always present

Normal RS232

communication

Instrument in FLASH

mode

(J4)

CORI-FLOW

MBC-II

L30

digital

With Jumper