19
Installation and Operation Manual
X-DPT-Profibus-Interface-eng
PN 541-C-068-AAG
November, 2008
The Profibus-DP standard EN 50170 also defines the option of setting the
station address through communication. This option has been disabled in the
Brooks Smart TMF series.
On top of this unique address number each slave uses three other address
numbers:
1.
Identity number
: This number is a unique, fixed, WORD size number
assigned by the Profibus Organization PNO to each type or class of
devices. It is programmed in the device’s source code and it is used to
establishes the link between the class of devices and its associated GSD
file. It is by standard definition part of the addressing mechanism and as
such part of every communication service.
2.
Global station address
: This station address, number 127, is a Profibus
defined address to be used in the transmission of global control command
messages. All slave devices connected to a network will recognize this
number as a valid address. Whether they will act up on this command
when received will depend on the third addressing option, which must be
used together with this global station address.
3.
Group number
: An additional address number can be assigned by the user
to a group of (different) devices. This group number, one byte in size must be
set as part of the parameterization service. It can be used in the global com-
mand service next to the global station address, to send command to a (sub)
group of devices on a network. Refer to section Appendix A for more informa-
tion.
3.4
ZERO PUSHBUTTON (only for 5800 series)
In order to be able to initiate a sensor zero request to (re)balance the flow sensor,
the device is equipped with a pushbutton. Pressing this button will cause the
processor to perform the necessary action to accomplish this. The action can
also be initiated through the protocol, by setting the appropriate bit flag in the first
command byte.
The zero pushbutton is located on the opposite side of the Profibus-DP address
selector switches on the Brooks Smart TMF device. To achieve a valid (re)-bal-
ance of the flow sensor, take the following actions:
1. Make sure the device has been fully warmed up after power-up, i.e. it should
be powered up for at least 45 minutes.
2. Make sure that no gas flow through the device is present. If there has been
any gas flow through the device after power-up, leave the device without gas
flow for 15 minutes, in order to stabilize the sensor.
3. Press the zero pushbutton and wait for 10 seconds. After that, the (re)balancing
of the sensor has been completed and the device is ready to be used. Now
gas flow can be (re)applied to the device
3.5
SUPPORTED BAUD RATES
Since the Profibus-DP interface has been implemented using the Siemens
SPC3 Profibus-DP slave ASIC, the baud rates supported are determined by the
capabilities of this component. The baud rates supported are listed in Table 3-3
below (Refer to doc. 6ES7-195-0BD00-8BA0:
Simatic-Net SPC3 Siemens
PROFIBUS Controller - User Description, v1.5, 10/96,
page 19, Siemens AG
1996).
