Siemens SIMATIC ET 200SP Manual page 21

Table 4-5
Bit 7 = 1
Bit 6 = 1
Bit 5 = 1
Bit 4 = 1
Bit 3 = 1
Bit 2 = 1
Bit 1 = 1
Bit 0 = 1
HART-Fast-Mode
The AQ 4xI HART analog module supports processing HART commands as a SHC sequence
("Successive HART Command").
That is, if the analog module detects a HART command with SHC bit set for a channel, the
complete HART command processing on the HART analog module is reserved for this channel
for approximately 2 s. For all other channels of the analog module, no HART frame processing
occurs during this time, see section HART communication interface (Page 22)
Note
● During the time a HART channel of the AQ 4xI HART analog module is processing an SHC
sequence, and thus the complete HART processing of the module is reserved for this
channel, the HART variables of all HART channels are no longer updated. They remain
unchanged in terms of value and quality code.
● HART commands for other channels are not processed and are acknowledged
correspondingly.
Burst mode
The AQ 4xI HART analog module does not support burst mode. HART commands with set
burst bit are ignored and are not forwarded to the connected field device.
Analog Output Module AQ 4xI HART HF
Manual, 05/2019, A5E35098013-AA
2nd status byte
Device fault
Configuration changed
Startup (cold start)
Additional status information available
Fixed analog output current setting
Analog output current saturated
Secondary variable outside the limits
Primary variable outside the range
HART function
4.1 How HART works
19