Servicing and maintenance
10
10.1 Identification and maintenance data
Definition and properties
Identification and maintenance data (I&M) is data that is stored in the CFU that supports you in
the following actions:
● Checking the system configuration
● Finding the hardware changes of a system
● Troubleshooting in a system
(I data) are data about the CFU, such as the article number and serial number, that are in part
also printed on the housing of the CFU. I data are manufacturer data about the CFU and can
only be read.
Maintenance data (M data) are system-dependent data, such as the installation location and
installation date. M data are created during configuring and is written to the CFU.
Through the I&M data the CFU can be identified uniquely online.
Reading and writing of the I&M data with PCS 7 and STEP 7
In HW Config the I&M data are displayed in the "Module state – CFU" tabs (see the online help
for STEP 7).
10.2 Maintenance
● Maintaining the CFU
Regular maintenance of the CFU itself is not necessary.
● Maintaining field devices
During maintenance of a field device, it may be useful to disable the fieldbus connection for
the respective field device.
● Maintaining sensors/actuators
During maintenance of a sensor/actuator, it can make sense to disable the respective
channel. This ensures that faults cannot influence the system.
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD 115
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