Siemens CP 1243-7 LTE Operating Instructions Manual page 19

User data
With the connection types listed below, the user data of a frame represent a consistent data
area in terms of the time of transfer.
User data per frame with the various connection types:
● For TCP connections: Max. 8192 bytes
● For ISO-on-TCP connections: Max. 1452 bytes
● For UDP connections: Max. 1472 bytes
With frames of telecontrol communication, the individual values of the data points are time
stamped.
Number of data points for the data point configuration
The maximum number of configurable data points is 200.
Frame memory (send buffer)
The CP has a frame memory (send buffer) for data points configured as an event.
The send buffer has a maximum size of 64 000 events divided into equal parts for all
configured communications partners. The size of the frame memory can be set in STEP 7.
See also section Process image, type of transmission, event classes, triggers (Page 84).
Messages: E-mail / SMS
Up to 10 messages can be configured in STEP 7 and sent as e-mails or SMS messages.
Maximum number of characters that can be transferred per SMS message: 160 ASCII
characters including any value sent at the same time
Maximum number of characters that can be transferred per e-mail: 256 ASCII characters
including any value sent at the same time
IPsec tunnel (VPN)
An IPsec tunnel can be established for secure communication with another Security module.
Firewall rules
The maximum number of firewall rules in advanced firewall mode is limited to 256.
The firewall rules are divided up as follows:
● Maximum 226 rules with individual addresses
● Maximum 30 rules with address ranges or network addresses
(e.g. 140.90.120.1 - 140.90.120.20 or 140.90.120.0/16)
● Maximum 128 rules with limitation of the transmission speed ("Bandwidth limitation")
CP 1243-7 LTE
Operating Instructions, 04/2017, C79000-G8976-C381-03
Application and properties
1.5 Configuration limits and performance data
19