Appendix D: Sample Sola Ii Flare Modbus Register; Modbus Map - Thermo Scientific SOLA II Flare User Manual

Modbus Map

Thermo Scientific

Appendix D: Sample SOLA II Flare Modbus Register

Note 32-bit integer values are transmitted in two consecutive 16-bit holding
registers. The first register contains the most significant word and the next
register the least significant.
The SOLA analyzer supports a sub-set of the TCP/IP Modbus Protocol.
Each SOLA requires a unique IP. The identifier is always 1.
Modbus Function Supported:
Function 01 Read Coils
•
Function 02 Read Status Inputs
•
Function 03 Read Holding Registers
•
Function 04 Read Input Registers
•
Function 05 Set Single Coil
•
Function 06 Set Single Holding Register
•
Function 15 Set Multiple Coils
•
Function 16 Set Multiple Holding Registers
•
Note Register numbering follows the standard Modbus encoding. The actual
number sent in the function query is one less than the number referred in the
documentation. The most significant number in parenthesis indicates the data
type and function used.
To avoid confusion and help in the initial test, a sync register with a constant
value is provided so communications between the PLC and the Flares can be
verified. ▲
A block of Holding Registers (accessible with functions 03, 06 and 16) are
added to the standard SOLA II Flare Modbus Map specially dedicated to the
Flare Monitoring Project.
Holding Registers (16 bits)
•
Read Function 03
•
Write Functions 06 and 16
•
SOLA II Flare User Manual D-1