Siemens SIMATIC S7-400 CP 440 - Configuration data

Configuring and Parameter Assignment the CP 440
5.4 Configuration data
Point-to-point connection CP 440 Installation and Parameter Assignment
68 Manual, 09/2007, A5E00057742-03
5.4 Configuration data
5.4.1 Introduction
Introduction
You can set the response of the CP 440 to CPU STOP by means of the basic parameters.
By selecting different protocols, you can adjust your CP 440 communication processor to suit
the properties of the communication partner.
The sections that follow describe the basic parameters of the CP 440 and the configuration
data for the ASCII driver and for the 3964(R) procedure.
5.4.2 Basic Parameters of the CP 440
Enter the basic parameters in the STEP 7 HW dialog box "Properties - CP 440 ". Open the
dialog box by double-clicking the CP 440 in the configuration table of STEP 7.
The basic parameters are described in the table below.
Table 5-2 Basic Parameters of the CP 440
Parameters Description Value Range Default Value
Reaction to CPU Stop This parameter controls the storage of
the received frames in the receive
buffer.
You can find more detailed information
in the following tables.
• Continue
• STOP
The transmission process is
terminated in both cases.
Continue
Affect of the “Reaction to CPU Stop” Parameter on the Storage of the Received Message Frames
The response depends on whether or not flow control is used.
Table 5-3 Control of Message Frame Storage Without Flow Control
Without Flow Control Saved Frames Frame Just Arriving New Frames
Reaction to CPU Stop:
Continue
Retained Saved; discarded if the buffer
is full
Saved until the buffer is full,
then discarded
Reaction to CPU Stop:
STOP
Retained Discarded Discarded
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