Siemens 200 Parameter Access R43,998 R46,999, Indexing the Parameter Access Area

Modbus Register Types

Parameter Access (R43,998 – R46,999)

Parameter values are given as integers in the range of registers from R44,000 to R44,999. The last three numbers of the register correspond to the parameter number.

Parameter Register #	Format Register #	Parameter #
44,000	46,000	P000
44,001	46,001	P001
44,002	46002	P002
…	…	…
44,999	46,999	P999

Usually, the parameters are all read / write.

Note:

•Parameters P000 and P999 are read only. If P000 is set to lock activated then all of the parameters are read only via the handheld programmer

•Parameter P999 (Master Reset) cannot be used via Modbus

•See Data Types on page 107 for a description of the different types of data associated with different parameters

Each parameter register has a corresponding format register that holds the format information required to interpret the value. See Format Words (R46,000 to R46,999) on page 105.

Parameter Indexing

Many parameters are indexed. There are two possible indexes: a primary index and a secondary index. A secondary index is a sub-address of the primary index. Some indexed parameters affect multiple I/O devices.

The following is an example of a primary index:

P111 is the Relay Control Function. This parameter determines how a relay is controlled by the MultiRanger (used as an alarm, for pump control, etc.). Because there are up to six relays on the MultiRanger, P111 is indexed by six to allow each relay to be programmed independently.

A few parameters also have a secondary index. While a secondary index is important for setting up the MultiRanger, it is almost never needed through remote communications.

Indexing the Parameter Access Area

Each parameter communicates its value to only one register. You must know the index(es) for the parameter in order to interpret the information in the register correctly.

For example, to make use of the value returned in register R44,111 you must know which relay it is referring to. See Relay Function Codes (P111 Only) on page 110 for details on P111 values.

To determine the index values, the primary and secondary index must be read or write. The two possible methods of handling these index values are described in the following paragraphs: Global Index Method and Parameter Specific Index Method.

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