Connecting Standard Systems To H Systems; S7 Communication (Sfb 12 “Bsend” And Sfb 13 “Brcv”); S7 Communication (Sfb 8 “Usend” And Sfb 9 “Urcv”); Simatic Ops, Simatic Mps - Siemens SIMATIC S7-400H Manual

Connecting Standard Systems to H Systems

Driver block"S7H4_BSR": you can use the driver block "S7H4_BSR" to connect
an H system to a STEP7 library. This block can be ordered at:
http://www.khe.siemens.de/it/index1360712_1.htm
Alternative SFB 15 "PUT" and SFB 14 "GET" in H System: Use SFB 15 "PUT"
alternatively via two standard connections. The first block will be called first. If no
error message is output during the execution of the block, the transfer will be
considered successful. If an error message is output, the data transfer will be
repeated via the second block. Even if an interruption in communication is
discovered later, the data will be transferred again to avoid any loss of information.
You can apply the same method to an SFB 14 "GET".
If possible use the S7 communication mechanisms for communication.
AP Red Software package : Limit your user data size to 240 bytes when using
the software "AP_RED". If a larger amount of data is required, transfer it by calling
the blocks sequentially.
The software package "AP_RED" uses the FB "AG_SEND" und FB "AG_RCV"
mechanisms. Use APRED to link to only SIMATIC S5 / S5 H controls or devices
from other manufacturers which support S5 compatible communication.
S7 Communication (SFB 12 "BSEND" and SFB 13 "BRCV")
Bear in mind that an SFB 12 "BSEND" in the user program is not called more often
than the corresponding SFB 13 "BRCV" in the communications partner.
S7 Communication (SFB 8 "USEND" and SFB 9 "URCV")
Use an SFB 8 "USEND" only as event–driven because this bus causes a high
communication load.
Bear in mind that a SFB 8 "USEND" in the user program is not called more often
than corresponding SFB 9 "URCV" in the communications partner.

SIMATIC OPs, SIMATIC MPs

Use a maximum of 4 OPs or 4 MPs in an H system. If more OPs/MPs are
required, you have to examine your entire automation task. In this case, consult
your local SIMATIC sales representative.
Do not select less than 1s for the picture update and increase this value to 2 s
where applicable.
Make sure that all the variables of a picture are requested with the same cycle time
so the jobs for reading variables can be grouped optimally.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Communication Functions
8-25