Siemens CP 342-5 - Characteristic Data for Multiplexing OP Connections

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10
17
Time response on S7 connections
Refer to the following table for transmission rates with S7 connections dependent on the
following parameters:
● Frame length (number of bytes)
● Job type
● CPU type
The values were measured while sending or receiving successively (at a transmission rate of
1.5 Mbps; bus profile standard; 9 nodes).
Table 1- 2 Number of S7 frames per second for CPU 317
Request type
Frame length
Number of S7 frames per sec-
ond
PUT
<=160 bytes
29 / s
GET <=160 bytes 26 / s
USEND/URCV
<=160 bytes
35 / s
BSEND/BRCV
<=160 bytes
25 / s
<=400 bytes
14 / s
<=800 bytes
8 / s
1.4.6
Characteristic data for multiplexing OP connections
General characteristic data
The following information is important when operating HMI (TD/OP) connections:
Characteristic
Explanation / values
Number of operable HMI connections
16 max.
When multiplexing OP connections, the following acyclic services are supported:
● read once
● write once
● read system status list
If cyclic services or ProAgent interfacing (ALARM_S message block) are required, please
continue to use the rack/slot addressing of the remote S7-300 CPU.
Note
PG connections and connections to WinCC
PG connections and connections to WinCC are not operated over the multiplexer. When
operating a PG, a connection resource is always occupied.