Siemens SIMATIC PCS 7 Operating Manual page 70

Configuring S7F/FH hardware
6.4 Setting system parameters for F-signal modules
HART Fast Mode
The electronic module is HART Fast Mode-capable and supports the processing of HART
commands as an SHC (Successive HART Command) sequence. If a HART command is
detected by the electronic module with a set SHC bit for a channel, the complete HART
command processing is reserved for approx. 2 seconds on the electronic module for this
channel. For all other channels of the electronic module, no HART command processing
occurs during this time.
For every further HART command with a set SHC bit, the electronic module reserves the
HART command processing for this channel again for another 2 seconds. If a HART
command is detected for this channel without a set SHC bit, or if no further command for this
channel arrives within 2 seconds of the previous HART command, then the electronic
module reverts to "normal" HART command processing. Result: All HART channels are re-
processed.
HART diagnostics
If you enable these parameters, a diagnostics interrupt is triggered during subsequent HART
diagnostics.
● HART analog output current specified
● HART analog output current saturated
● HART communication error
● HART primary variable outside limits
● HART secondary variable outside limits
● HART error function HART device
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB