Thank you for purchasing Milltronics’ products. We endeavour to design equipment that
is simple to use and reliable in its operation, with the aim of satisfying our customers’ needs.
Milltronics has been designing and manufacturing process equipment since 1954. Our
fields of expertise include ultrasonic level measurement, in-line weighing of dry bulk solids
and motion sensing.
Milltronics is established world wide through associate offices and representatives. Our network
is continually being refined to provide our customers with first rate sales information, engineering
assistance and after sales support.
For more details on our products and service, please contact us and we will provide you with
a listing of the offices or representatives nearest you.
Milltronics SmartLinx module for Allen-Bradley is a ‘plug in’ communications circuit card
designed to interface any Milltronics SmartLinx compatible device to Allen-Bradley
Remote I/O.
The module may have been shipped installed in your unit, or shipped separate for site
installation. Refer to your associated Milltronics device instruction manual for details on
its location or physical installation.
Refer to associated Milltronics SmartLinx compatible device instruction manual for
location or installation of the module.
HARDWARE SETUP
SmartLinx module for Allen-Bradley Remote I/O
module connector (underside) to Milltronics device
termination
switch
cable connector
reserved switches
status LEDs (refer to Operation)
TERMINATION SWITCH
termination setting
openoff
150 Ω external*off
82 Ωon
RESERVED SWITCH
setting
all on
CABLE CONNECTION
*termination resistor (as required)
clear
shield
blue
Connect using Belden 9463 ‘Blue Hose’ cable or equivalent and terminate (blue/clear)
according to Allen-Bradley specification and conventions.
5PL-533
SOFTWARE SETUP
GENERAL
It is recommended to set up the Milltronics device as a 1⁄4 rack size, to conserve remote
rack space available to the PLC. As discrete I/O operation is very limited when using 1⁄4
rack size configuration, block transfer read and write commands are recommended.
Avoid discrete I/O as it does not provide any advantage over block transfers. (Transfer
speed is not an issue, as transfer rates are much greater than the rate where new
readings are generated by the Milltronics device.)
It is also recommended to exercise caution when deciding how often to trigger the BTR
and BTW instructions. Too often increases the delay of all block transfers on the
Remote I/O link. A recommended guideline is to trigger the BTR and BTW instructions
no faster than every 0.3 seconds.
SPECIFIC PARAMETERS
P751baud rate
Sets the baud rate for Remote I/O communication between
Milltronics device and Allen-Bradley.
values:0 = 57.6 kbaud
1 = 115.2 kbaud
2 = 230.4 kbaud
The default value is 0.
P752rack number
Enter the rack number (octal) that the Milltronics device has been assigned
on the Remote I/O link. The valid range is 01 – 73. Check your PLC manual
for the supported range.
The default value is 2.
P753starting group
Sets the starting group number for the Milltronics device.
starting grouprack size (P754)
values:01, 2, 3 or full
21, 2 or 3 /4
41 or 2 /4
61/4
The default value is 0.
PL-5336
P754rack size
Sets the discrete I/O address space. Valid settings are 1 to 4 quarter racks,
dependent upon the starting group (P753).
rack sizestarting group (P753)
values:1/40, 2, 4 or 6
The default value is 0.
P755last rack
The last rack is defined as the highest numbered rack on the Remote I/O link.
Determine the position of Milltronics device and set this parameter
accordingly.
value:0 = not last
The default value is 0.
2/40, 2 or 4
3/40 or 2
full0
1 = last
OPERATION
Communication on the Remote I/O link is indicated by the SmartLinx LEDs.
offno communication between bus and module
flashbus intact, Allen-Bradley PLC in program; or
Milltronics device set to different rack size
than PLC
onactive communication
onnot being scanned by PLC
7PL-533
APPLICATION LAYER
The application layer is the name given to the organization and format of the discrete
I/O and block transfer communications areas of the Milltronics device . All transactions
between the PLC and the Milltronics device are either reading parameter values from
the Milltronics device, or setting parameter values in the Milltronics device.
This manual refers to a 10 point level instrument; if your device has fewer than 10
points, you should ignore data in registers which represent non-existing points. Those
registers will still be present, but will contain undefined values.
The Milltronics device parameters take on many values in various formats, as discussed
in the Milltronics device manual. For the convenience of the PLC programmer, those
values are converted to and from a 16-bit integer number, since those are easily
handled by most PLCs. This section describes that conversion process; later sections
detail where those values are in discrete I/O and block transfer addresses, and how to
get the parameters you need.
Numeric values
Numeric parameter values are by far the most common. For example, parameter P920
(Reading), returns a number representing the current reading (either level or volume,
depending on the Milltronics device configuration).
Numeric values may be requested or set in either units or percent of span, and may be
specified with a number of decimal places.
Numeric values must be in the range -10,000 to +10,000 to be valid. If a parameter is
requested and its value is more than +10,000, the number 32,767 is returned; if it is less
than -10,000, the number -32,768 is returned. If this happens, increase the number of
decimal places for that parameter.
If a parameter cannot be expressed in terms of percent (e.g. span), or has no
meaningful value, the special number 22,222 is returned. Try requesting the parameter
in units, or refer to the Milltronics device manual to understand the requested
parameter.
“Split” Values
Certain parameters are actually a pair of numbers separated by a colon, in the format
xx:yy.
One example is P807, Transducer Noise, where:
xx = the average noise value in dB
yy = the peak noise in dB.
PL-5338
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