Siemens HydroRanger 200 Bedienerhandbuch PDF herunterladen (Seite 110)

Page 96 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FCO1

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Modbus Register Types

Usually, the parameters are all read / write.

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)

page 98.

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 HydroRanger 200 (used as an alarm, for pump control, etc.). Because there are six

relays on the HydroRanger 200, 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 HydroRanger 200, 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 104 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

Reading Parameters

To read parameter values, follow the steps listed in either the Global or the Parameter

Specific Index Method that follow. You must be able to program your HMI or SCADA

system before completing these methods.

Note:

• Parameters P000 and P999 are read only. If P000 is set to lock activated then all of

the parameters are read only

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

•See

Data Types

on page 101 for a description of the different types of data

associated with different parameters

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