Siemens SIMATIC S5 Manual page 47

2 Engineering
Description of the blocks
The following blocks contain the communication program of the S5-CPU.
Table 2-13
Block
OB 21
OB 22
OB 1
FB 34
FB244
FB245
FB249
DB 100
DB 101
OB21/OB22 (STARTUP OBs)
The following functions are implemented in the startup of the SIMATIC S5-CPU:
•
The set interface (interface no. = 0) of the CP1430 TCP is initialized and
synchronized via the handling block "HTB_Synchron" (FB 249).
•
An internal startup bit (M 170.5) resets the initial count value.
OB1 (cyclic OB)
The following functions are processed in the cyclic OB1 of the SIMATIC S5-CPU:
•
This example scenario 2b is started via the enable bit (M 130.4).
•
Call of the user communication block ID5_S7 (FB 34) which calls the send and
receive functions via S5 handling blocks (HTBs) and increments the count
values in the data area.
•
Call of the handling blocks SEND ALL and RECEIVE ALL for data transfer to
the CP1430 TCP.
FB34 (ID5_S7)
The function block FB 34 contains the time-triggered call of the send and receive
functions in which a simple simulation program demonstrates the exchange of
data.
•
An enable of the communication is initiated via the startup bit M 170.5
(OB21/22).
•
Every second (clock memory bit), a count value (in DB100) is sent to the S7-
1500 CPU via the ISO-on-TCP connection.
•
After the data have been received, this count value is checked in the S7-1500,
incremented by +1 and sent back to the SIMATIC S5 at the next send trigger of
the S7-1500. The data received by the SIMATIC S5 are transferred to DB101.
•
A simple error analysis regarding the connection status is done by storing the
indicator words and parameter error bytes.
HTB_SEND block: ANZW: MW100 PAFE: MB104
HTB_RECEIVE block: ANZW: MW105 PAFE: MB109
Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2,
Symbol
Startup_OB21
Startup_OB22
Main
ID5_S7
HTB_SEND
HTB_RECEIVE
HTB_SYNCHRON
-
-
07/2019
Description
Startup OB (restart/warm start)
Startup OB (network/cold start)
User program call of FB 34 and of the HTBs
SEND/RECEIVE ALL
Time-triggered call of the send and receive
functions via S5 handling blocks (HTBs).
Increase of count value in the data
Handling block SEND (-All A-NR:= 0)
Handling block RECEIVE (-All A-NR:= 0)
Handling block SYNCHRON
Data area for sending
Data area for receiving
47