Siemens SIMATIC CP 440, Руководство пользователя

Страница: 80 / 172

Configuring and Parameterizing the CP 440
5-16
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Protocol Parameters
You can only set the protocol parameters if you have not set the default values in
the protocol.
Table 5-11 Protocol Parameters (3964(R) Procedure)
Parameter Description Value Range Default Value
Character Delay
Time The character delay time defines the
maximum amount of time permitted
between two incoming characters
within a message frame. 20 ms to 65535 ms in
10 ms increments
The shortest character
delay time depends on the
transmission rate
300 bps 60 ms
600 bps 40 ms
1200 bps 30 ms
2400 to
115200 bps
20 ms
220 ms
Acknowledgment
Delay Time The acknowledgment delay time
defines the maximum amount of time
permitted for the partner’s
acknowledgment to arrive during
connection setup (time between STX
and partner’s DLE acknowledgment)
or cleardown (time between DLE ETX
and partner’s DLE acknowledgment). 20 ms to 65535 ms in
10 ms increments
The shortest
acknowledgment delay
time (ADT) depends on
the transmission rate:
300 bps 60 ms
600 bps 40 ms
1200 bps 30 ms
2400 to
115200 bps
20 ms
2000 ms
(550 ms with
3964 and no
block check)
Setup Attempts This parameter specifies the
maximum number of attempts the
CP440 is allowed in order to establish
a connection. 1 to 255 6
Transmission
Attempts This parameter specifies the
maximum number of attempts
permitted to transfer a message frame
(including the first one) in the event of
an error. 1 to 255 6