Communication Types - Siemens CP 1243-1 Operating Instructions Manual

Forwarding the time from the CP to the CPU
Note
Forwarding the time to the CPU
Depending on the firmware version of the modules involved, the time-of-day of the CP is
forwarded to the CPU in different ways:
• Optional forwarding of the CP time to the CPU using a PLC tag
• Obligatory forwarding of the CP time to the CPU via the backplane bus
The forwarding of the CP time to the CPU depends on the firmware version of the CP and
the CPU. Note the following behaviour.
● CP firmware ≤ V2.1.6x
With this firmware version the CP can make the time-of-day available to the CPU as an
option via a PLC tag. When this PLC tag is read cyclically by the CPU, the CPU adopts
the CP time.
In the parameter group "Communication with the CPU", you can set whether or not the
current time of day of the CP will be made available to the CPU via a PLC tag. For TLC
tags, see parameter group "Communication with the CPU" of the CP.
● CP firmware ≥ V2.1.77 and CPU firmware ≥ V4.2
If both modules in the station have the named firmware versions, the time of day of the
CP is automatically forwarded to the CPU.
Since the CPU automatically adopts the CP time, you no longer require the forwarding
option using the PLC tag.
If for the CPU the option "CPU synchronizes the modules of the device" is enabled in
"PROFINET interface > Time synchronization", all smart modules of the station are
synchronized with the CPU time.
4.5

Communication types

In this parameter group, you enable the communication types of the CP.
To minimize the risk of unauthorized access to the station via Ethernet, you need to enable
the communications services that the CP will execute individually. You can enable all options
but at least one option should be enabled.
"Communication types" parameter group
● Enable telecontrol communication
– TeleControl Basic
– DNP3
– IEC 60870-5
Note that if you change the telecontrol communication type later, all specific parameters
are deleted. These also include data point and partner information among other things.
CP 1243-1
Operating Instructions, 04/2017, C79000-G8976-C365-03
Configuration
4.5 Communication types
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