II - DCE FEL ČVUT v Praze

SIMATIC S7 HART Analog Modules
Access to the field
devices
Modifying the
parameters of the
field devices
Information on
status
4-10
The HART analog module generally accepts the modification of parameters
for the field devices. Access rights can only be allocated using the parameter
assignment tool.
To modify the parameters of the field devices connected to the HART analog
modules, proceed as follows:
Steps
1
2
3
To modify the parameters of a field device,
enter a HART command using the SIMATIC
PDM parameter assignment tool.
When the parameters of the field device
are modified, the HART analog module
triggers a diagnostic interrupt, provided
this option is enabled.
This diagnostic interrupt must be
acknowledged by the programmable logic
controller at the end of the block OB82 before
you can access the field device again: the
acknowledgement is generally made from the
programmable logic controller.
Fig. 4-7 How to modify the parameters of the field devices
SIMATIC
PDM
STEP7
After you have modified the parameters of a HART field device, the
corresponding bit is entered in the device status. This should be regarded as
an indicator and not as an error and is reset by the module. For more
information, see HART status bytes Section 4.5.1. You have to acknowledge
the automation system diagnostic interrupt (OB 82) before you can have
access to the field device again.
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04