Siemens 200 Primary and Secondary Indexes, Primary Index, Accessing a Secondary Index

Primary and Secondary Indexes

Primary Index: relates to direct input or output and can refer to relays, communications ports, and other parameters. In parameters that allow secondary indexes, the primary index is often referred to as a point.

Secondary Index: relates to previously indexed parameters where the parameter requires a second index, permitting multiple values on an indexed input or output.

Primary Index

Example Setting: P111[3] = 52

P111

Operation

1 2 3 4 5 6

52

•P111 sets the Relay Control Function

•P111(3) = 52 sets Relay #3 to a value of 52.

Secondary Index

Parameters with a secondary index permit multiple values for a primary index (point). For example, a volume calculation based on vessel characterization breakpoints requires a distinct set of breakpoints for each measured point.

Thus the primary index refers to the measurement point, and each secondary index refers to a characterization breakpoint value.

Accessing a Secondary Index

1.Press MODE and then press DISPLAY to activate secondary index. The icon appears under the index field.

2.Enter the secondary index, and then enter the values to set the secondary index.

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