7ML19981FB05 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
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