Siemens HydroRanger 200, Instruction Manual

Page: 111 / 280

7ML19985FC03 HydroRanger 200 – INSTRUCTION MANUAL Page 101
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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.
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 113 for details.
4. Read the value from the appropriate parameter register.
Types of values are:
• Numeric Values , on page 105
•
Bit Values
, on page 105
•
Split Values
, on page 106
•
Text Messages
, on page 107
•
Relay Function Codes (P111 Only)
, on page 108
A value of 22,222 indicates that an error has occurred. Specify a different format
type and try again.