Bronkhorst FLOW-BUS interface - Manual (Page 20)

BRONKHORST ®
Page 20 FLOW‐BUS interface 9.17.024
4.1.3 Remote installation to FLOW‐BUS
Some FLOW‐BUS modules have to be installed on the bus by means of another FLOW‐BUS module or a (personal)
computer. This can be done as follows:
 With a Readout/Control module, series E‐7000 or with a software program on the PC this new module can be
searched.
 The Readout/Control module or PC‐program will find the first free node‐address counted from address 3 (3 is
first free address).
 This free address number will be send to the new module, which should become active on this address.
 After a reset command, also send by the Readout/Control module or PC‐program, the new module will be
operational on the FLOW‐BUS system.
Make sure to install only one new module at the same time.
4.1.4 Install to bus on a pre‐defined node‐address or re‐address instrument on the bus
In some applications it is necessary to put FLOW‐BUS devices on pre‐defined addresses because of the application
software expecting this device on this address (e.g. PLC‐applications). This can be done as follows:
(Install new module to the bus as described in the previous paragraphs.)
 By means of the rotary switch on the instrument (if present).
 By means of the micro‐switch on the instrument. See instruction manual 9.17.023.
 By means of the special menu in an E‐7000 module for digital instruments it is possible to (re‐) address
instruments on the bus.
 Go to the specific menu part and read the PNA (Primary Node Address) number.
 Fill‐in the address you want the instrument to have on the bus.
 The E‐7000 module will check if this address is already occupied by another instrument. If so, you could remove
the other one and try again, or enter another address.
 The module will restart and will get its new address from that moment on.
Because it is not allowed in a FLOW‐BUS system to have 2 devices on the same node‐address, at
(re)start of the instrument there will also be a check performed if its node‐address (in memory) is
already occupied by another device. If so, the red LED will blink slowly. At that moment the module is
not operational on the bus. You first have to re‐install it. The easiest way to do this is to press the micro
push‐button on top of the instrument until the green LED starts blinking fast. After releasing the button
the instrument will install itself on the bus automatically on a free address. When the green LED is
burning continuously, the instrument is operational.
If you take one or more modules out of your system, or if one or more modules do not get power, be
careful installing new modules, or changing the configuration. This situation may occur if you take
modules out for service. If you don’t change the configuration, you can replace your serviced
instrument/module in your system without any problem. Mostly new modules will get the first free
address, counted from address 3 (3 will be the first). This could be an address which should not be
occupied (e.g. from a module which has been taken‐out for service). In that case install the new module
and re‐address it as described, to avoid FLOW‐BUS communication problems.
When connecting an instrument/module to the FLOW‐BUS, make sure that the instrument/module is in
power‐off mode. After connection to the bus you can switch power on. At power‐up there will be a
check to avoid the situation of two modules on the same bus address. This is important for error‐free
bus‐communication.