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MODBUS REG. LIST FOR 2350A GC F-1
MON2000________________________________________________________________________________
JULY 2010 Introduction – SIM_2251 & User_Modbus
FA
APPENDIX F, MODBUS REG. LIST FOR 2350A GC
F.1 INTRODUCTION – SIM_2251 & USER_MODBUS
GC Controller Modbus registers that may be of interest to the developer
are of two varieties, SIM_2251 and User_Modbus. Differences are
summarized in the following table.
F.1.1 NOTES ON USER_MODBUS
Section F.2 lists only variables included in the User_Modbus Boolean
Modbus registers. These registers are not user-defined and primarily
contain alarm flags, possibly useful for debugging purposes. To use the
Modbus Test software to view the contents of these registers, you will
need to set the Function parameter to “1 (Read Coil)”. See Section 10.2
through Section 10.4 for details on using the Modbus Test software.
Table F-1 Comparison of SIM_2251 and User_Modbus
SIM_2251 User_Modbus
Serial slave port. Serial slave port.
Modified protocol that allows floating point
numbers to be transmitted over Modbus via
2251 emulation slave type.
The standard Gould Modbus protocol that
accommodates 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 2.16.3; for an
example report, see Appendix A,). For more
detail about register contents, see
Section F.2.1.
Variables assigned to registers can be listed
in contents of a PC-Config Report (for
instructions, see Section 2.16.3; for an
example report, see Appendix A,). Boolean
(coils) contents also listed in Section F.2.
When using the Modbus Test software, set
Register Mode to “DANIEL” to view register
contents (see Section 10.2.3).
When using the Modbus Test software, set
Register Mode to “PLC LH” to view register
contents (see Section 10.2.3).