User Manual

MON20/20 Software for Gas Chromatographs

3-9000-745

SEPTEMBER 2010

 

 

This section provides detailed instructions for using the Modbus program. Use this program only if you are familiar with Modbus communication protocol and the operation of MON 20/20.

7.1.1 Comparing Modbus protocols

MON 20/20 and the Modbus program can accommodate two different Modbus protocols: SIM_2251 and User_Modbus. Separate Modbus registers are reserved for each protocol; therefore, some settings for MON 20/20 and WinMB depend on which Modbus protocol is used.

The protocol you need depends, ultimately, on the hardware used for data acquisition from the GC Modbus register contents.

The following comparison should help clarify the differences between the two protocols as well as the utility of each.

Table 7-1.Comparing SIM_2251 and User_Modbus Protocols

SIM_2251

User_Modbus

 

 

Serial slave port

Serial slave port

 

 

Modified protocol that allows floating point

Standard Gould protocol that accommodates PLC

numbers to be transmitted over Modbus via 2251

Emulation LO-HI (PLC-LH)

emulation slave type

 

 

 

Most register contents are predefined; some

Predefined Boolean (coils)

registers can be user-defined

User-defined Numeric (registers)

 

 

Data types are predefined for registers 1000 to

Data types are user-defined

9000

 

 

 

Variables assigned to registers can be listed in the

Variables assigned to registers can be listed in the

GC Config Report. For instructions and an

GC Config Report. For instructions and an

example report, see Section 5.12. See Appendix C

example report, see Section 5.12. See Appendix C

for more detail about individual registers.

for more detail about individual registers.

 

 

When using the Modbus program, set Register

When using the Modbus program, set Register

Mode to “DANIEL” to view register contents.

Mode to “PLC- LH” or “PLC-HL” to view register

 

contents.

 

 

It is not necessary to assign scales to registers.

It may be necessary to assign scales to registers, to

 

convert floating point values to whole integer

 

representations.

 

 

7-2

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Emerson Process Management 3-9000-745 manual Comparing Modbus protocols, SIM2251 UserModbus
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