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Configuration
2. Click this button and the Scaling Calculator will be displayed, note the input range should be automatically selected.
3. Now simply enter the minimum and maximum water levels, in this example 0 and 10 respectively, into the
SCALED
OUTPUT RANGE
MIN
and
MAX
fields.
4. Click the [
CALCULATE
] button, this will generate the Multiplier and Offset. See figure
scaling calculator for a 4-20mA sensor
.
5. Click the [
OK
] button to accept the calculated values, iLink will automatically copy the calculated multiplier and offset
into the given sensors’ configuration fields.
Figure 17 – Shows an example of using the scaling calculator for a 4-20mA sensor
3.8
Modbus Protocol
This chapter contains the following subsections:
§
§
Example of iRIS acting as a Master
§
Example of iRIS acting as a Slave Sensor
§
Example of iRIS acting as a protocol gateway (Modbus Slave)
3.8.1
Protocol Overview
Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use
with its programmable logic controllers (PLCs). Modbus has become a de facto standard communication protocol and is
now a commonly available means of connecting industrial electronic devices.
A detailed reference guide can be found at the following web address:
http://modbus.org/docs/PI_MBUS_300.pdf
This section will be a brief overview of the protocol, with indication as to which aspects are supported by the iRIS.
Modbus protocol uses a Master and Slave topology. A single Master device can interrogate (both read and writing data) to
one or more slaves. Communications is achieved over a serial or TCP interface, at this point in time the iRIS supports RS-
232 and RS-485 serial protocols. Due to space constraints the Modbus Protocol can be used on the Serial Sensor Interface
– see
for more information about configuration. The iRIS 270 can have up to three sperate
interfaces.
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Summary of Contents for iRIS Under Cover
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Page 13: ... 2022 HyQuest Solutions 13 Installation Figure 2 Mounting Diagram ...
Page 108: ... 2022 HyQuest Solutions 108 Appendices 8 1 Declaration of Conformity ...
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