Siemens SIMATIC 6DL1 136-6AA00-0PH1 Manual page 82

HART function
8.2 HART system connection
Among other things, this information is evaluated by the I/O module and signaled to the CPU via
maintenance messages.
Description
The 1st and 2nd status byte is structured as follows:
1st status byte
With bit 7 = 1: Communication error
Bit 6 = 1
Bit 5 = 1
Bit 4 = 1
Bit 3 = 1
Bit 2 = 0
Bit 1 = 1
Bit 0 = 0
With bit 7 = 0: Bit 0 to 6 Specific according to the response frame
2nd status byte
Bit 7 = 1
Bit 6 = 1
Bit 5 = 1
Bit 4 = 1
Bit 3 = 1
Bit 2 = 1
Bit 1 = 1
Bit 0 = 1
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Parity error
Overflow
Framing error
Checksum error
Reserved
Overflow in the receive buffer
Reserved
Device error
Configuration changed
Startup (cold start)
More status information available
Fixed analog output current
Analog output current saturated
Secondary variable outside the limits
Main variable outside range
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA