II - DCE FEL ČVUT v Praze

Default settings
Wire break
monitoring
Inserting and
removing modules
Operation with
standard master
How a fall in the
load voltage
affects diagnostic
messages
Readback
capability
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
SIMATIC S7 HART Analog Modules
The HART output type is set as default. There are other default settings for
substitute values, diagnostics, and interrupts (see Table 4-4). The HART
analog output module uses these settings, unless you modify them using
STEP 7.
Wire break monitoring is possible for the current range 0/4 to 20 mA.
Conditions: A minimum output current of >500A is required.
The HART analog modules support the function “Change modules during
operation.” However, it is only possible to evaluate the insert / remove
module interrupts with a S7/M7 400 CPU master an active backplane bus in
the ET 200M.
Information on operating the modules in a distributed configuration with a
standard master can be found in manual /140/ . The manual lists the
differences to be taken into consideration if you are operating the modules
with a S7/M7 DP master and a standard master (for example IM 308C with
S5).
Parameter assignment with COM PROFIBUS (.GSE file or type file
required)
Restricted evaluation when inserting or removing modules
If the 24 V load voltage falls below the permitted rated range (< 20.4 V),
there may be a reduction in the output current at connected loads > 650
and output currents > 20 mA before a diagnostic message is transmitted.
The analog outputs can be readback in the user data range (see Fig. 4-20)
with a resolution of 8 bits. (+polarity). Please note that the readback analog
output is only available after a conversion time which varies with the
precision desired.
4-21