Address Space - Siemens SIMATIC ET 200SP Manual

Configuring/address space

6.2 Address space

6.2 Address space
The following tables shows the mapping of the address space of the AQ 4xI HART analog
output module for a configuration with value status (Quality Information, QI) and with HART
variables.
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
● "AQ" stands for analog output
● "QAQn" stands for value status (QI) of the analog output n
● "QC"stands for Quality Code
Address space
The following tables show the allocation of the address space of the I/O module.
● The addresses for the value status are only available if the value status has been enabled
or configured.
● The addresses for the HART variables are only available if the HART variables have been
configured or parameterized.
Evaluating the value status
If you enable the value status for the analog output module, an additional byte is occupied in the
input address space. This additional byte offsets the HART range by one byte. Bits 0 to 3 in this
byte are assigned to the corresponding channel. The provide information about the validity of
the analog value, namely irrespective of the diagnostics enables.
There is one bit value status for each analog output in the input address space.
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"
Generally, the value status is set to "good" if the analog value can be output without errors. The
value status is set to "bad" in the following cases:
● The analog value cannot be output due to an error.
● The analog output is deactivated.
● The substitute value is output at the analog output.
Evaluating HART variables
If you have configured (mapped) HART variables for the analog output module, four HART
variables with 5 bytes each are stored in the input address space.
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Analog Output Module AQ 4xI HART HF
Manual, 05/2019, A5E35098013-AA