Dialup Network - Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual

Configuration
4.9 Serial interface
Polling parameters
● Ratio "Polling / Spontaneous"
Max. number of spontaneous frames that can be sent by a master station between two
polls.
Only for interfaces with the Network node type "Master station".
Default setting: 0. Permitted range: 0...255. If 0 (zero) is set, the function is disabled.
Event transmission
● Type of transmission
Specifies the form in which data frames are sent.
– As single frames
– Several frames as a block
4.9.5.2

Dialup network

Settings dialup network
Only the configurable parameters are explained.
Settings serial interface
Number of spontaneous frames
● Number of spontaneous frames
Only for interfaces with the Network node type "Station" / "Node station".
The parameter decides after how many frames the master station has the opportunity of
transferring its pending frames to the station. As maximum, the configured number of
spontaneous frames that are pending at the time of the first call frame are transferred.
Default setting: 200. Permitted range: 0...255
If 0 (zero) is set, all spontaneous frames are sent at the call.
● Limit for locked frames
Only for interfaces with the Network node type "Station" / "Node station".
Frames are marked as locked when due to communications problems they cannot be
transferred to the communications partner.
The parameter specifies the maximum quota of locked frames in the send buffer. If the
value is exceeded, the image procedure is used for new frames to prevent the send
buffer from overflowing.
Default setting: 50. Permitted range: 0...90
If 0 (zero) is set, all spontaneous frames are sent at the call.
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Operating Instructions, 02/2018, C79000-G8976-C385-03
CP 1243-8 IRC