Address Space - Siemens SIMATIC ET 200SP HA Equipment Manual

Parameters, diagnostics messages and address space
A.7 Address space
A.7

Address space

Abbreviations
• "IB" stands for input byte, that is, the module start address in the input area
• "QB" stands for output byte, that is the module start address in the output area
• "QAIn" stands for value status (QI) of analog input n
• "QC"stands for Quality Code
Evaluating the value status
The input address space contains one value status (QI) bit for each analog input.
Irrespective of the diagnostics enables, each value status (each QI bit) provides information on
the validity of the corresponding process value.
• Value status = 1: Process value okay, "good"
• Value status = 0: Process value not okay, "bad"
Basically, the value status is set to "good" when the analog value can be acquired without error.
The value status is set to "bad" in the following cases:
• The analog value cannot be acquired due to an error.
• The analog input is disabled.
Address space
The following tables show the allocation of the address space of the I/O module.
Addresses for the HART area are only available if HART variables or a multiHART area were
configured in the properties dialog of the module.
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AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB