00522-G Mon 2000 Software Manual Sec_G 1MB.pdf

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Model 2350/2350A GC Controller Modbus registers that may be ofinterest to the developer are of two varieties, SIM_2251 and

User_Modbus. Differences are summarized in the following table.

Section G.2 lists only variables included in the User_Modbus BooleanModbus registers. These registers are not user-defined and primarilycontain alarm flags, possibly useful for debugging purposes. To use the

Modbus Test software to view the contents of these registers, you willneed to set the Function parameter to “1 (Read Coil)”. See Section 9.2 through Section 9.4 for details on using the Modbus Test software.

Table G-1 Comparison of SIM_2251 and User_Modbus

SIM_2251 User_Modbus

Serial slave port. Serial slave port.

Modified protocol that allows floating pointnumbers to be transmitted over Modbus via

2251 emulation slave type.

The standard Gould Modbus protocol thataccommodates PLC Emulation LO-HI.

Nearly all register contents are predefined;

a few 9000-series registers can be user-

defined (i.e., read-write).

Boolean (coils) are predefined. Numeric

(registers) are user-defined.

Variables assigned to registers can be listed

in contents of a PC-Config Report (for

instructions, see Section 2.9.4; for an

example report, see Appendix A,). For more

detail about register contents, see

Section G.2.1.

Variables assigned to registers can be listed

in contents of a PC-Config Report (for

instructions, see Section 2.9.4; for an

example report, see Appendix A,). Boolean

(coils) contents also listed in Section G.2.

When using the Modbus Test software, set

Register Mode to “DANIEL” to view register

contents (see Section 9.2.3).

When using the Modbus Test software, set

Register Mode to “PLC LH” to view register

contents (see Section 9.2.3).

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All other User_Modbus registers can be defined by the user. To defineUser_Modbus register contents (through assignment of variables), see

Section 5.14.3.

To obtain a complete list of register assignments, both SIM_2251 and

User_Modbus, use MON to produce a PC-Config Report.

To use the Modbus Test software and view the contents of SIM_2251registers, you will need to set Register Mode to “Daniel”, as noted in Table

G-1.

To obtain a complete list of register assignments, both SIM_2251 and

User_Modbus, use MON to produce a PC-Config Report.

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00522-G Mon 2000 Software Manual Sec_G 1MB.pdf