IGS-NT Communication Guide
146
10 Modbus Appendix
10.1 Modbus Switches 146
10.2 Data types 146
10.3 Communication status 148
10.4 Error list 150
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10.1 Modbus Switches
The “Modbus Switches” are two Modbus registers dedicated for continuous writing of binary information via
Modbus. Both registers are available on Modbus for simple writing (using command 6 or 16). The particular bits
of these registers are available as binary status for universal use in logical binary outputs of the controller as
“MODBUSSW1..MODBUSSW32”. No password is required for writing of those registers (if there is no general
password for Modbus writing). There are two Values “ModbusSw1” and “ModbusSw2” in group “Log Bout”
available for back-reading.
Register for writing Modbus register number Value for back-reading Modbus register number
ModbusSw1 46337 ModbusSw1 40547
ModbusSw2 46338 ModbusSw2 40548
Note: Modbus register number for back-reading may be different based on controller family. Check register
numbers in list of registers described in “How get numbers of ModBus communication objects”. Register
number for writing is not mentioned in list of registers.
Note: The LSB of ModbusSw1 (46337) corresponds with LBO “ModbusSw1”
The LSB of ModbusSw2 (46338) corresponds with LBO “ModbusSw17”
Register for writing Modbus register number LBO ModbusSw16 ………………….ModbusSw1
ModbusSw1 (46337) 000F HEX 0000 0000 0000 1111
Register for writing Modbus register number LBO ModbusSw32 ………………….ModbusSw17
ModbusSw2 (46338) F000 HEX 1111 0000 0000 0000
10.2 Data types
The following table contains the communication objects data types and their representation in the data part of
the communication function.
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