Technoton MasterCAN CAN2RS, Руководство по эксплуатации, Страница: 41 / 54

Configuring converters / Configuration of MasterCAN CAN2RS for data conversion from SPN into Modbus RTU registers
MasterCAN RS2CAN / CAN2RS data converters. Operation manual. Version 1.0
© Technoton, 2020 41
REG_VALUE=SPN * factor
SPN
/ factor
rg
- ((offset
rg
- offset
SPN
) / factor
rg
) (2)
where
SPN - value of the selected SPN;
factor
SPN
and offset
SPN
- values of SPN attributes automatically selected by the converter
from S6 Database (DB S6);
factor
rg
and offset
rg
- values of register attributes specified by the user in the fields
Factor and Offset respectively (see the operation documentation
(list of Modbus RTU registers) of the corresponding receiving device).
In case the parameter is not converted during saving in the
register, the attributes by default will assume the following values:
factor
rg
= 1 and offset
rg
= 0;
Note — You should take note that given different physical values, the additional conversion for
the attributes factor
spn
and offset
spn
should be performed in the selected input SPN and in the
specified Modbus RTU register.
Examples:
a) In case the value of the
Parameter in the input SPN is specified in kPa and the value for the
register — in bar, then, taking into account the correlation 1kPa = 0.01 bar, =100 kPa,
the factor
spn
base value should be divided by 100.
b) To recalculate the temperature Parameter from ° C into K, you need to add 272.15 to the
offset
spn
value.
Figure 25 — Example of slots for conversion of data from SPN into Modbus RTU registers
In order to copy the settings of the slot created earlier into the new slot, tick the field to the
left from the number of the slot which is to be copied and press
button. For this
operation, you may highlight only one slot for copying (see figure 25).
To delete one specific slot, use
button, to the right of its settings. To delete all created
slots, press button.
In Service S6 MasterCAN software for each SPN, whenever you place the cursor on its name,
prompts containing its number, data range etc. are displayed. The automatic control of
correctness of values entered is provided in the fields for editing settings. The corresponding
prompts appear, whenever you place the cursor on the field with the value to be edited.
During work with MODBUS-CAN Gate FM of the converter MasterCAN CAN2RS the software
operates with the data of S6 Database ( PGN and SPN ). The list of SPN of the converter
MasterCAN CAN2RS , FM which are configured and/or displayed using the software is provided
in annex A .
To update S6 Database in Service S6 MasterCAN software, press in the
dropdown menu . The detailed description of S6 Database can be found at
https://www.jv-technoton.com/ .