LENZE E82EV751K2C E82EV751K2C E82EV751K2C E82EV751K2C E82EV751K2C E82EV751K2C

Comments of elements in block interfaces of FBs, FCs, DBs and UDTs
● Network titles in blocks written in LAD, FBD or STL
● Block comments
● Network comments
● Comments of LAD and FBD elements
The R/H CPUs support archiving of multilingual project texts in up to three different
project languages. If the project texts for a project language nevertheless exceed the
memory space reserved for them on the SIMATIC memory card, the project cannot be
downloaded to the CPU. The download is aborted with a notice that not enough memory
space is available. In such a case, take measures to reduce the required storage space, for
example by shortening comments.
Note
Size of the SIMATIC memory card
Make sure that there is enough available storage space on your SIMATIC memory card for
downloading projects.
You can find information on reading out the memory usage of the CPU and the SIMATIC
memory card in the Structure and Use of the CPU Memory All R/H CPUs have an internal clock. The clock shows:
● The time of day with a resolution of 1 millisecond
● The date and the day of the week
The clock change for daylight saving time is also taken into account.
In redundant mode, the two CPUs of the R/H redundant system constantly
synchronize their internal clocks.
You can synchronize the time of the CPUs using the NTP procedure.
Principle of operation
In NTP mode, the device sends time queries at regular intervals (in client mode) to the NTP
server in the subnet (LAN). Based on the replies from the servers, the most reliable and
most accurate time is calculated and the time of day on the R/H CPU is
synchronized. The advantage of this mode is that it allows the time to be synchronized
across subnets. You can synchronize the time of day of up to a maximum of four NTP
servers. You address a communications processor or an HMI device, for example, as
sources for time synchronization via the IP addresses.
The update interval defines the interval between the time queries (in seconds). The value
range for the interval is 10 seconds to one day. In NTP mode, it is generally UTC (Universal
Time Coordinated) that is transferred. UTC corresponds to GMT (Greenwich Mean Time).
Conditions
● In the R/H redundant system, you need to configure time synchronization in NTP
mode for each CPU individually. If possible, use the same settings for both CPUs.
● The settings for time synchronization with NTP mode are defined at PROFINET interface
X1. PROFINET interface X2 uses the settings from PROFINET interface X1.
● Make sure that the primary CPU maintains a constant connection to the NTP server. The
backup CPU then receives its synchronized time of day from the primary CPU.
Procedure
Proceed as follows to enable time synchronization for a CPU:
1. Configure the interface properties in the "Properties > General > PROFINET interface >
Time synchronization" parameter group. Select the "Enable time synchronization via NTP
server" option.
2. Enter the IP addresses of up to four NTP servers at parameter "Server 1-4".
3. Set the time interval for time queries at the parameter "Update interval"You use your own server in your network. Your own server offers the following advantages: