Alicat PROFIBUS User Manual
Operating Bulletin
PROFIBUS
Innovative Flow and Pressure Solutions
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Notice: Alicat Scientic, Inc. reserves the right to make any changes and improvements to the
products described in this manual at any time and without notice. This manual is copyrighted. This
document may not, in whole or in part, be copied, reproduced, translated, or converted to any
electronic medium or machine readable form, for commercial purposes, without prior written consent
from the copyright holder.
Note: Although we provide assistance on Alicat Scientic products both personally and through our
literature, it is the complete responsibility of the user to determine the suitability of any product to
their application.
Alicat Scientic, Inc.’s Wide-Range Laminar Flow Element Patent: The wide-range laminar ow
element and products using the wide-range laminar ow element are covered by U.S. Patent Number:
5,511,416. Manufacture or use of the wide-range laminar ow element in products other than Alicat
Scientic products or other products licensed under said patent will be deemed an infringement.
Alicat Scientic, Inc. warrants to the original purchaser (hereinafter referred to as “Buyer”) that
Limited Lifetime Warranty
instruments manufactured by Alicat Scientic (hereinafter referred to as “Product”) shall be free from
defects in materials and workmanship for the life of the Products.
Under this warranty, the Product will be repaired or replaced at manufacturer’s option, without charge
for parts or labor when the Product is carried or shipped prepaid to the factory together with proof of
purchase.
The foregoing shall constitute the exclusive and sole remedy in lieu of other remedies of the Buyer for
any breach by Alicat Scientic of this warranty to the maximum extent permitted by law.
This warranty does not apply to any Product which has not been installed or used in accordance with
the Product operation and installation specications provided to Buyer verbally or in writing by Alicat
Scientic for the proper and normal use of the Product.
Buyer agrees hereunder that Alicat reserves the right to void any warranty, written or implied, if upon
Alicat’s examination of Product shall disclose to Alicat’s satisfaction that the Product failure was due
solely, or in part, to accident, misuse, neglect, abuse, alteration, improper installation, unauthorized
repair or improper testing by Buyer or agent of Buyer.
Alicat Scientic shall not be liable under any circumstances for indirect, special, consequential, or
incidental damages in connection with, or arising out of, the sale, performance, or use of the Products
covered by this warranty.
Alicat Scientic does not recommend, warrant or assume responsibility for the use of the Products in life
support applications or systems.
Alicat’s warranties as herein above set forth shall not be enlarged, diminished or affected by, and no
obligation or liability shall arise or grow out of Alicat’s rendering of technical advice in connection with
Buyer’s order of the Products furnished hereunder.
If Product becomes obsolete, Alicat Scientic, at its own discretion, reserves the right to repair the
Product with available replacement parts or upgrade the Product to a current, commercially available
version of the original Product. Should upgrading the Product be deemed necessary by Alicat, Buyer
hereby agrees to pay an upgrade fee equal to seventy percent of the retail value of the replacement
Product. Alicat Scientic hereunder makes no claim that replacement Products will look, function or
operate in the same or similar manner as the original product.
When a Product is returned to Alicat Scientic for recalibration this service is considered normal
preventative maintenance. Recalibration of Product shall not be treated as a warranty service unless
recalibration of Product is required as the result of repairs to Product pursuant to this Warranty. Failure
to recalibrate Product on a yearly basis will remove any and all obligations regarding repair or
replacement of Product as outlined by this Warranty to Buyer from Alicat Scientic.
This Warranty is in lieu of all other relevant warranties, expressed or implied, including the implied
warranty of merchantability and the implied warranty of tness for a particular purpose, and any warranty
against infringement of any patent.
Continued use or possession of Products after expiration of the applicable warranty period stated above
shall be conclusive evidence that the warranty is fullled to the full satisfaction of Buyer.
Alicat makes no warranty as to experimental, non-standard or developmental Products.
Accessories purchased from Alicat are not covered by this warranty.
Conformity / Supplemental Information:
The product complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly. Contact the
manufacturer for more information.
08/23/2011 Rev.2 DOC-MAN-PROFIBUS
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1.1 PROFIBUS
Alicat units can be optionally congured with a PROFIBUS communication
interface. PROFIBUS communications are done with telegrams. The following
is presented to an audience that is informed on the details of the PROFIBUS
specication. Details about connections and specications are found in the
standard Alicat Operating Manual and on pages 10-11 of this bulletin.
1 GSD Conguration File
The latest GSD le can be downloaded from the Alicat website (www.
alicatscientic.com) or requested and sent via email. It is a text based document
that allows easy conguration of a PROFIBUS Alicat meter/controller onto a
PROFIBUS network. The GSD le takes precedence over this document in
any discrepancy.
2 PROFIBUS Operation
The PROFIBUS equipped unit does not have a termination resistor built in.
The user cabling must ensure that there is a terminator at the end of their bus.
Connection to a PROFIBUS unit is done through the female DB9 connector
on the top of the unit. This connector can optionally provide power to the unit.
There is a green LED on the top of the unit, it indicates if proper communication
is occurring. Upon connection to a bus, the unit goes through the following:
Auto Baud Rate Detect; optional Set Slave Address; Wait Parameterization;
Wait Conguration; and Data Exchange.
3 Auto Baud Rate Detect
At power up, a PROFIBUS equipped Alicat meter/controller will initialize its
PROFIBUS interface and enter baud rate detect mode. The unit supports all
standard baud rates given in the PROFIBUS specication. These baud rates
are listed in the GSD le. Once the baud rate is detected, the unit will be ready
to be parameterized or a new slave address can be set.
4 Set Slave Address
PROFIBUS equipped units, unless otherwise specied, are set at address
125. The address can be changed with the set slave address telegram as
specied in the PROFIBUS Specication. The customer can order PROFIBUS
unit(s) to be set at a different address from the factory.
The set slave address function can only be done before the unit has been
parameterized. After parameterization the unit will ignore set slave address
requests. The change of address is done immediately and it is stored into
nonvolatile memory.
Alternatively, the user can connect the unit to a serial port and change the
address which is stored in register 65. The details of reading and writing
register values are included in the standard Alicat Operating Manual. Please
note that an invalid address can be entered in this fashion and the user is
cautioned to use only addresses from 1-125.
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4.1 Wait Parameterization
After baud rate detection, or if PROFIBUS communications have been
stopped and restarted, the unit will be in wait parameterization state. Items
that are parameterized are gas select and error mode for the totalizer (if
totalizer equipped).
4.1.1 Gas Select
The default gas select in the GSD le is “keep current.” This particular gas
select tells the unit not to change the gas select that the unit had the last time
it was powered up. Therefore, if the user wants to keep the factory default gas
of the unit as it was ordered, leaving this at “keep current” will achieve that.
All Alicat standard gases are available in the parameterization section. If the
user wishes to change the gas select “on the y”, this can be done via the
command word and is described in the data exchange section.
4.1.2 Totalizer Rollover
If a unit is equipped with a totalizer, the way the unit will respond to a rollover
event can be modied with this parameter. The error mode parameter for the
totalizer allows the user to set one of three modes for the totalizer.
These modes are: No Rollover with Error, Rollover with Error, and Rollover
with No Error.
It is important that this parameter is set if a mode other than the default
set by the GSD is desired.
This is required because every Alicat unit that is congured on the network will
take on the default setting in the GSD le. PROFIBUS equipped units that are
not equipped with totalizer function will ignore this parameter.
4.2 Wait Conguration
To allow user exibility, all PROFIBUS equipped Alicat units are modular on a
PROFIBUS network. The user can pick and choose which input(s)/output(s)
to/from the master are desired. These modules can be congured in any
order and number as long as the total number of bytes does not exceed the
maximum set in the GSD le.
While waiting for conguration, the meter/controller will accept and verify the
conguration telegram. If an incorrect conguration is attempted, it will be
immediately rejected.
Note that at this time all congurations that are valid in structure are accepted
as being valid. Any input value to the master that is not supported by the unit
will always input a zero. All outputs from the master that are not supported by
a particular meter/controller conguration will be ignored.
After power cycle a unit will default to the following conguration:
Reading: 0x42,0xA4,0xA4,0x01
Set-point: 0x82,0x03,0x3,0x0B
Control Register: 0x82,0x00,0x00,0x0C
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