Appendix C, Modbus registers list

There are two GC Modbus registers that may be of interest to the developer: SIM_2251 and User_Modbus. Differences betweeb the two registers are summarized in Table C-1.

Table C-1 Comparison of SIM_2251 and User_Modbus

SIM_2251

User_Modbus

 

 

Serial slave port.

Serial slave port.

 

 

Modified protocol that allows floating point

The standard Gould Modbus protocol that

numbers to be transmitted over Modbus via 2251

accommodates PLC Emulation LO-HI.

emulation slave type.

 

Nearly all register contents are predefined; a few

Boolean (coils) are predefined. Numeric

9000-series registers can be user-defined (i.e.,

(registers) are user-defined.

read-write).

 

Variables assigned to registers can be listed in

Variables assigned to registers can be listed in

the GC Config Report. For instructions and an

the GC Config Report. For instructions and an

example report, see Section 5.12.

example report, see Section 5.12.

When using the Modbus Test program, set

When using the Modbus Test software, set

Register Mode to “DANIEL” to view register

Register Mode to “PLC LH” to view register

contents (see Section 7.1.2).

contents (see Section 7.1.2).

 

 

C.1 User_Modbus register list

Table C-2lists only variables included in the User_Modbus Boolean Modbus registers. These registers are not user-defined and primarily contain alarm flags that may be useful for debugging purposes. To use the Modbus program to view the contents of these registers, you will need to set the Function parameter to 1 (Read Coil). See Section 7.1 for details on using the Modbus program.

All other User_Modbus registers can be defined by the user. To define User_Modbus register contents, see Section 4.12.3.

C-1

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Emerson Process Management 3-9000-745 manual Appendix C, Modbus registers list, UserModbus register list
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