Ieee Tags - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Analog electronic modules
13.10 Basics of HART
Prerequisites
The HART electronic modules support the HART Fast Mode as of the following product
versions / STEP 7 hardware updates:
HART electronic modules
4 AI I 2WIRE HART
4 AI I 4WIRE HART
4 AO I HART
HART Fast Mode
If a HART command with an SHC bit set for a channel is detected by the electronic module,
the full HART command processing capacity is reserved on this electronic module for this
channel for approx. 2 seconds. No other HART command processing is performed during this
time on any other channels of the electronic module.
The electronic module reserves the HART command processing for this channel for another
2 seconds for each additional HART command with set SHC bit. If a HART command is
detected without a set SHC bit for this channel or if no other command is issued for this channel
within 2 seconds of the preceding HART command, the electronic module returns to "normal"
HART command processing. Result: All HART channels are processed again.
Note
● During the time a HART channel of the electronic module is processing a SHC sequence,
which means that full HART processing capacity of the electronic module is reserved for
this channel, the HART variables of all HART channels are no longer updated. Their values
and quality codes remain unchanged.
● HART requests for other channels are not processed and they are acknowledged
accordingly.
● If a HART channel is in use by multiple clients (for example SIMATIC PDM, user program),
the response provided by the electronic module cannot be clearly directed to a specific
client. HART electronic modules do not support client management.
As of V6.0 SP5, PDM supports processing of HART requests with SHC sequences. To use
this, you need to specifically activate "HART RIO SHC Mode" in the "Communication" tab
under "Options -> Settings" in PDM.
13.10.7

IEEE tags

Properties
Each analog module with HART can read up to four IEEE tags in addition to the analog value.
These tags are represented in IEEE 754 format. This involves the
IEEE standard 754 short real number (floating-point format).
312
Product version STEP 7 hardware update (HSP)
9 053 as of V3.0
8
9 057 as of V3.0
Operating Instructions, 11/2017, A5E00247483-07
float format according to
ET 200iSP