Application and functions
1.4 Performance data
CP 443-5 Extended
Manual, 11/2018, C79000-G8976-C162-09
17
Program block
Meaning
START (SFB 19) / STOP (SFB 20)
Run a warm restart / stop on a remote device.
RESUME (SFB 21)
Run a hot restart on a remote device.
STATUS (SFB 22)
Query the device status of a remote partner.
USTATUS (SFB 23)
Receive the status change of a remote device.
CONTROL (SFC 62)
Query the status of the connection belonging to
an SFB instance.
For more information on the program blocks for S7 communication, see also STEP 7 online
help or the manual /8/ (Page 43))
1.4
Performance data
1.4.1
Transmission speeds supported
The transmission speed is set with the SIMATIC STEP 7 configuration software. For the
permitted values, refer to Table 7-1 in Section 7 (Page 35)
Note
Remember the cable length
The permitted cable length must be kept to depending on the transmission speed. Refer to
the information in /4/ (Page 42)
1.4.2
Characteristic data of the DP interface
General characteristic data
No special program blocks are required for DP mode. The interfacing to the distributed I/O is
by direct I/O access or using program blocks (SFCs/SFBs) of the CPU (see /4/ (Page 42)).
Table 1- 4
General characteristic data of DP mode
Characteristic
Explanation / values
Number of operable DP slaves
125
Max. size of the input area of all DP slaves
4 Kbytes
Max. size of the output area of all DP slaves
4 Kbytes
Maximum number of inputs per DP slave
244 bytes
Maximum number of outputs per DP slave
244 bytes
Max. size of the consistent area for a module
128 bytes
