Interfaces to automation systems
8.2 Modbus interface
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
141
8.2.4 Modbus adresses
8.2.4.1 Standard Modbus
● The component value is transferred in IEEE 32 bit floating point format. SITRANS SL
uses two word registers representing a floating point value.
● The measurement counter is transferred in 32 bit integer format. SITRANS SL uses two
Word-Registers representing a 32 bit integer value.
● The time stamp fields (day, hour, minute, and second) are transferred in 16 bit integer
format. SITRANS SL uses one word register representing a 16 bit integer value.
Modbus addresses 30000 ... 39999
Modicon-
modbus-
address
Type Data
Address
Description
30001 Input Register 0 Component 1 – Concentration
Measurement counter
30003 Input Register 2 Component 1 – Concentration
Quality
30004 Input Register 3 Component 1 – Concentration
Value
30006 Input Register 5 Component 1 – Concentration
Time stamp – Day
30007 Input Register 6 Component 1 – Concentration
Time stamp – Hour
30008 Input Register 7 Component 1 – Concentration
Time stamp – Minute
30009 Input Register 8 Component 1 – Concentration
Time stamp – Second
30010 Input Register 9 Component 2 – Transmission
Measurement counter
30012 Input Register 11 Component 2 – Transmission
Quality
30013 Input Register 12 Component 2 – Transmission
Value
30015 Input Register 14 Component 2 – Transmission
Time stamp – Day
30016 Input Register 15 Component 2 – Transmission
Time stamp – Hour
30017 Input Register 16 Component 2 – Transmission
Time stamp – Minute
30018 Input Register 17 Component 2 – Transmission
Time stamp – Second
30019 Input Register 18 Component 3 – Pressure
Measurement counter
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