Operating instructions

PTQ-MCM ♦ Quantum / Unity Platform Modifying the Configuration File
Modbus Communication Module
Page 72 of 139 ProSoft Technology, Inc.
April 29, 2008
Example #1
Modbus Address Data Type Parameter
47101 32 bit REAL TEMP Pump #1
47102 32 bit REAL Pressure Pump #1
47103 32 bit REAL TEMP Pump #2
47104 32 bit REAL Pressure Pump #2
With the module configured as a master, you only need to enable these
parameters to support a write to this type of addressing (Modbus FC 6 or 16).
If the slave device shows addressing as shown in Example #2, then you need not
do anything with the Float Flag, Float Start parameters, as they use two Modbus
addresses to represent one floating point value:
Example #2
Modbus Address Data Type Parameter
47101 32 bit REAL TEMP Pump #1
47103 32 bit REAL Pressure Pump #1
47105 32 bit REAL TEMP Pump #2
47107 32 bit REAL Pressure Pump #2
Because each 32 bit REAL value is represented by two Modbus Addresses
(example 47101 and 47102 represent TEMP Pump #1), then you need not set
the Float Flag, or Float Start for the module for Modbus FC 6 or 16 commands
being written to the slave.
Below are specific examples:
Master is issuing Modbus command with FC 16 (with Float Flag: Yes) to transfer Float data
to Slave.