Application and functions
1.8 Requirements for operation
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
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The send buffer has a maximum size of 16000 frames. The size of the frame memory is
divided equally among all configured communications partners. It can be set in STEP 7
Basic, refer to the section Communication with the CPU (Page 95).
You will find details of how the send buffer works (storing and sending events) as well as the
options for transferring data in the section Process image, type of transmission, event
classes (Page 144).
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
Up to 8 IPsec terminals can be established for secure communication with other security
modules.
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")
Requirements for operation
Hardware
Apart from the CP, in the remote S7-1200, the following hardware is also required:
● A CPU with firmware version as of V4.1
● For communication via WAN networks (dedicated line, dial-up / GSM / wireless network):
A TS module
You will find the TS modules in the telecontrol accessories program, refer to the appendix
TS modules (Page 193).
A TS basic device (TS Adapter) is not required.
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