Master mechanic Security+ 642-2MM Manuel d'instructions télécharger pdf (Page 113)

7ML19981FB06 MultiRanger 100/200 – INSTRUCTION MANUAL Page 103

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Modbus Register Types

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.

Global Index Method (P782 = 0)

Global format method sets index values for all parameters simultaneously. Use this

method to read multiple values set to the same index values.

1. Write the primary index value into R43,999.

This is a value between 0 and 40 which specifies the input or output indexed by the

parameter.

Examples are:

• Transducer 1 is index 1

• Discrete input 2 is index 2

• Relay 5 is index 5

2. Write the secondary index value into R43,998.

This is a value between 0 and 40 that specifies the secondary index on the

parameter. This value is usually 0.

3. Write the desired format value into the appropriate format register. Because the

primary and secondary indexes are already specified, these portions of the format

word are ignored and only the last digit is significant.

See

Format Registers

on page 115 for details.

4. Read the value from the appropriate parameter register.

Types of values are:

•

Numeric Values

, on page 107

•

Bit Values

, on page 107

•

Split Values

, on page 108

•

Text Messages

, on page 109

•

Relay Function Codes (P111 Only)

, on page 110

A value of 22,222 indicates that an error has occurred. Specify a different format

type and try again.

Parameter Specific Index Method (P782 = 1)

The Parameter Specific index method sets the index values for each parameter

independently. Use this method to read multiple parameters with different index values.

1. Write the primary index, secondary index, and data format values into the

appropriate format register.

For example, to read the following information:

• measured level (P921)

• in units with three decimal places

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 279 280

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Master mechanic Security+ 642-2MM Manuel d'instructions Page 113

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