Siemens CP 1243-1 Operating Instructions Manual page 16

Application and properties
1.5 Configuration limits and performance data
● S7 connections and TCP / UDP / ISO-on-TCP connections
Max. 14 connection resources, can be distributed as required for:
– S7 connections (PUT/GET)
– Connections via program blocks (OUC) to S7 stations
● Online functions
1 connection resource is reserved for online functions.
● PG/OP connections
– 1 connection resource for PG connections
– 3 connection resources for OP connections
Number of data points for the data point configuration
The maximum number of configurable data points is 200.
User data
The data to be transferred by the CP is assigned to various data points in the STEP 7
configuration.
The size of the user data per data point depends on the data type of the relevant data point.
You will find details in the section Datapoint types (Page 89).
Frame memory (send buffer)
The CP has a frame memory (send buffer) for the values of data points configured as an
event and that are sent to the communications partner.
The send buffer has a maximum size of 64000 events divided into equal parts for all
configured communications partners. The size of the frame memory can be set in STEP 7,
refer to the section SNMP (Page 53).
With the Telecontrol Basic protocol the send buffer can also be used for up to three partners
for inter-station communication You create the configuration in the "Partner" parameter
group.
Messages (e-mail)
● Sending of up to 10 messages (e-mails) can be configured with the message editor.
● Sending e-mails via the TMAIL_C program block
IPsec tunnel (VPN)
Up to 8 IPsec terminals can be established for secure communication with other security
modules.
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Operating Instructions, 04/2017, C79000-G8976-C365-03
CP 1243-1